Dr Zuliang Chen

Dr Zuliang Chen

Conjoint Associate Professor

Global Centre for Environmental Remediation

Career Summary

Biography

Please write your Biography

Zuliang Chen has received his PhD from the University of New South Wales, Australia in the field of Analytical Chemistry. Chen has over 20 years of experience in teaching and research through various organizations within Australia such as CSIRO and University of South Australia, and presently at University of Newcastle working as Research Associate Professor.

Chen has excellent track record throughout his research career with outstanding publications and technical reports. To his credit he has supervised several HDR students and regularly mentored visiting scientists. In total, Chen  has over 215 journal refereed publications and 2 patents with more than 4128 citations with h index 34.

Research Expertise

Environmental Analytical Chemistry

The development of analytical methodologies employing hyphenated techniques through chromatography and mass spectrometric techniques to analyse various contaminants and their environmental impacts. Particular attention is given towards speciation techniques employing such techniques which are significant to environmental monitoring.

Nanomaterials for Environmental Remediation

The development of new functional nanomaterials used for environmental remediation. Main focus of this research is towards synthesis of nanomaterials, their nanotoxicities and chemistry of bio-nano interfaces. Several novel functional nanomaterials based on iron nanoparticles (FeNPs) have been devolved with potential application in field remediation of contaminants. These technologies and methods provide new insights into in-situ field remediation.

Biomaterials for Environmental Remediation

We aimed at the isolation of various cell strains and understanding the degradation of organic contaminants such as TNT, and development of immobilized cells as new functional biomaterials.  In addition, we also integration of nanodegradation and biodegradation used for the environmental remediation. 


Qualifications

  • PhD, University of New South Wales
  • Bachelor of Science, Xiamen University - China

Keywords

  • Analytical Chemistry
  • Biomaterials
  • Nanomaterials

Fields of Research

Code Description Percentage
030199 Analytical Chemistry not elsewhere classified 50
100708 Nanomaterials 30
090301 Biomaterials 20
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Chapter (1 outputs)

Year Citation Altmetrics Link
2014 Chen ZX, Cheng Y, Chen Z, Megharaj M, Naidu R, 'Kaolin-supported nanoscale zero-valent iron for removing cationic dye¿crystal violet in aqueous solution', Nanotechnology for Sustainable Development, Springer, New York 189-196 (2014)
DOI 10.1007/978-3-319-05041-6_15
Co-authors Megh Mallavarapu, Ravi Naidu

Journal article (239 outputs)

Year Citation Altmetrics Link
2018 Gan L, Lu Z, Cao D, Chen Z, 'Effects of cetyltrimethylammonium bromide on the morphology of green synthesized Fe

© 2017 Elsevier B.V. In this paper, iron oxide nanoparticles (IONPs) are successfully synthesized using Eucalyptus leaf extract in the presence of cetyltrimethylammonium bromide ... [more]

© 2017 Elsevier B.V. In this paper, iron oxide nanoparticles (IONPs) are successfully synthesized using Eucalyptus leaf extract in the presence of cetyltrimethylammonium bromide (CTAB) to enhance the dispersion and reduce aggregation of IONPs. CTAB was used as a stabilizing and capping agent in biosynthesis of IONP was observed. The particle size decreased from 183.9 ± 30.1 nm to 89.8 ± 17.1 nm as the concentration of CTAB increased from 0 to 0.4 mM CTAB, indicating that CTAB reduce the aggregation of IONPs and enhance the reactivity. In addition, the removal efficiency of phosphate declined from 95.13% to 89.58% when the CTAB concentration increased from 0.4 to 10 mM, indicating that a CTAB impacted on micelles and lipophilic biomolecules in Eucalyptus leaf extract, and hence affected the formation of IONPs. Furthermore, SEM image showed that the smaller spherical with some irregularly shaped CTAB-IONPs having a diameter of 80¿90 nm in the presence of 0.4 mM CTAB were observed. The date from EDS, FTIR and TGA suggested that the CTAB capped on the surface of CTAB-IONPs, while XRD showed that zero-valent iron and iron oxide were formed. Finally, the formation mechanism of IONPs was proposed.

DOI 10.1016/j.msec.2017.08.073
2017 Cheng Y, Wang L, Faustorilla V, Mallavarapu M, Naidu R, Chen Z, 'Integrated electrochemical treatment systems for facilitating the bioremediation of oil spill contaminated soil', Chemosphere, 175 294-299 (2017) [C1]
DOI 10.1016/j.chemosphere.2017.02.079
Citations Scopus - 1
Co-authors Liang Wang, Megh Mallavarapu, Ravi Naidu
2017 Wang L, Cheng Y, Lamb D, Lesniewski P, Chen Z, Mallavarapu M, Naidu R, 'Novel recalibration methodologies for ion-selective electrode arrays in the multi-ion interference scenario', Journal of Chemometrics, 31 (2017) [C1]
DOI 10.1002/cem.2870
Co-authors Liang Wang, Megh Mallavarapu, Dane Lamb, Ravi Naidu
2017 Faustorilla MV, Chen Z, Dharmarajan R, Naidu R, 'Determination of Total Petroleum Hydrocarbons in Australian Groundwater Through the Improvised Gas Chromatography-Flame Ionization Detection Technique', JOURNAL OF CHROMATOGRAPHIC SCIENCE, 55 775-783 (2017) [C1]
DOI 10.1093/chromsci/bmx038
Co-authors Ravi Naidu, Raja Dharmarajan
2017 Chen Y, Lin J, Chen Z, 'Remediation of water contaminated with diesel oil using a coupled process: Biological degradation followed by heterogeneous Fenton-like oxidation', CHEMOSPHERE, 183 286-293 (2017)
DOI 10.1016/j.chemosphere.2017.05.120
2017 Lin J, Sun M, Liu X, Chen Z, 'Functional kaolin supported nanoscale zero-valent iron as a Fenton-like catalyst for the degradation of Direct Black G', CHEMOSPHERE, 184 664-672 (2017) [C1]
DOI 10.1016/j.chemosphere.2017.06.038
2017 Weng X, Cai W, Lin S, Chen Z, 'Degradation mechanism of amoxicillin using clay supported nanoscale zero-valent iron', APPLIED CLAY SCIENCE, 147 137-142 (2017) [C1]
DOI 10.1016/j.clay.2017.07.023
2017 Li C, Zhuang Z, Jin X, Chen Z, 'A facile and green preparation of reduced graphene oxide using Eucalyptus leaf extract', Applied Surface Science, 422 469-474 (2017) [C1]

© 2017 Elsevier B.V. In this paper, a green and facile synthesis of reduced graphene oxide (GO) by Eucalyptus leaf extract (EL-RGO) was investigated, which was characterized with... [more]

© 2017 Elsevier B.V. In this paper, a green and facile synthesis of reduced graphene oxide (GO) by Eucalyptus leaf extract (EL-RGO) was investigated, which was characterized with ultraviolet-visible spectroscopy (UV), Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and Thermal gravimetric analysis (TG). Eucalyptus leaf extract also play both reducing and capping stabilizing agents prepared EL-RGO as shown a good stability and electrochemical properties. This approach could provide an alternative method to prepare EL-RGO in large-scale production. Moreover, the good electrochemical property and biocompatibility can be used in various applications. In addition, the merit of this study is that both the oxidized products and the reducing agents are environmental friendly by green reduction.

DOI 10.1016/j.apsusc.2017.06.032
2017 Zhang C, Li J, Chen Z, Cheng F, 'Factors controlling adsorption of recalcitrant organic contaminant from bio-treated coking wastewater using lignite activated coke and coal tar-derived activated carbon', Journal of Chemical Technology and Biotechnology, (2017)

© 2017 Society of Chemical Industry. BACKGROUND: Low-cost coal-based carbonaceous material has attracted special attention for removal of organics from industrial wastewaters. In... [more]

© 2017 Society of Chemical Industry. BACKGROUND: Low-cost coal-based carbonaceous material has attracted special attention for removal of organics from industrial wastewaters. In this study, coal tar-derived activated carbon (AC1) and lignite activated coke (AC2) were employed to identify the fundamental factors that facilitate the selection of suitable adsorbents for removing recalcitrant organic contaminant (ROC) from bio-treated coking wastewater (BTCW). RESULTS: Results show that AC2 exhibited superior ROC adsorption efficiency (57.9%), which was apparently higher than that of AC1 (45.2%), in spite of its lower specific surface area (238.05 m 2 g -1 ) and pore volume (0.21 cm 3 g -1 ). FTIR and XPS characterization indicated that AC2 possessed a distinctive configuration of functional groups, of which the basic oxygenic groups (60%) provided more hydrophobic adsorption sites for ROC. 3D-EEM spectra suggested more aromatics and fluorescent materials were removed by AC2 compared with AC1. GC-MS further confirmed that AC2 had stronger affinity with the ROC in BTCW, especially for PAHs and heterocyclic compounds. CONCLUSION: Surface chemistry is vital to the adsorption of ROC from coking wastewater, of which basic oxygenic functional groups have specific interactions with PAHs and heterocyclic compounds. The mechanism that best explains ROC adsorption is p-p dispersion between carbon materials and the pollutants, as well as the hydrogen-bonding interactions. This study provides an encouraging and practical guide to ROC adsorption from BTCW in future operations.

DOI 10.1002/jctb.5328
2017 Jiang K, Li K, Yu H, Chen Z, Wardhaugh L, Feron P, 'Advancement of ammonia based post-combustion CO2 capture using the advanced flash stripper process', APPLIED ENERGY, 202 496-506 (2017)
DOI 10.1016/j.apenergy.2017.05.143
2017 Yue X, Liu W, Chen Z, Lin Z, 'Simultaneous removalofCu(II) and Cr(VI) by Mg-Al-Cl layered double hydroxide and mechanism insight', JOURNAL OF ENVIRONMENTAL SCIENCES, 53 16-26 (2017)
DOI 10.1016/j.jes.2016.01.015
2017 Liu Y, Zha S, Dharmarajan R, Chen Z, 'Divalent cations impacting on Fenton-like oxidation of amoxicillin using nZVI as a heterogeneous catalyst', Separation and Purification Technology, 188 548-552 (2017) [C1]
DOI 10.1016/j.seppur.2017.07.061
Co-authors Raja Dharmarajan
2017 Weng X, Guo M, Luo F, Chen Z, 'One-step green synthesis of bimetallic Fe/Ni nanoparticles by eucalyptus leaf extract: Biomolecules identification, characterization and catalytic activity', CHEMICAL ENGINEERING JOURNAL, 308 904-911 (2017) [C1]
DOI 10.1016/j.cej.2016.09.134
Citations Scopus - 3Web of Science - 1
2017 Guo M, Weng X, Wang T, Chen Z, 'Biosynthesized iron-based nanoparticles used as a heterogeneous catalyst for the removal of 2,4-dichlorophenol', SEPARATION AND PURIFICATION TECHNOLOGY, 175 222-228 (2017) [C1]
DOI 10.1016/j.seppur.2016.11.042
2017 Faustorilla V, Chen Z, Dharmarajan R, Naidu R, 'Improved method for the determination of polycyclic aromatic hydrocarbons in contaminated groundwater and soil samples at trace levels employing GC-MSD technique', Environmental Technology & Innovation, 8 218-232 (2017) [C1]
DOI 10.1016/j.eti.2017.07.003
Co-authors Raja Dharmarajan, Ravi Naidu
2017 Faustorilla MV, Dharmarajan R, chen Z, naidu R, 'Clean-up of the solid liquid extraction using certified reference material for soil TPH by GC-FID', Journal of Research Analytica, 3 81-87 (2017)
Co-authors Ravi Naidu, Raja Dharmarajan
2017 Lin J, Weng X, Dharmarajan R, Chen Z, 'Characterization and reactivity of iron based nanoparticles synthesized by tea extracts under various atmospheres', Chemosphere, 169 413-417 (2017) [C1]
DOI 10.1016/j.chemosphere.2016.11.092
Citations Scopus - 1
Co-authors Raja Dharmarajan
2016 Subramaniyam V, Subashchandrabose SR, Thavamani P, Chen Z, Krishnamurti GSR, Naidu R, Megharaj M, 'Toxicity and bioaccumulation of iron in soil microalgae', Journal of Applied Phycology, 28 2767-2776 (2016) [C1]

© 2016, Springer Science+Business Media Dordrecht. Microalgae are extensively used in the remediation of heavy metals like iron. However, factors like toxicity, bioavailability a... [more]

© 2016, Springer Science+Business Media Dordrecht. Microalgae are extensively used in the remediation of heavy metals like iron. However, factors like toxicity, bioavailability and iron speciation play a major role in its removal by microalgae. Thus, in this study, toxicity of three different iron salts (FeSO 4 , FeCl 3 and Fe(NO 3 ) 3 ) was evaluated towards three soil microalgal isolates, Chlorella sp. MM3, Chlamydomonas sp. MM7 and Chlorococcum sp. MM11. Interestingly, all the three iron salts gave different EC50 concentrations; however, ferric nitrate was found to be significantly more toxic followed by ferrous sulphate and ferric chloride. The EC 50 analysis revealed that Chlorella sp. was significantly resistant to iron compared to other microalgae. However, almost 900¿µg¿g -1 iron was accumulated by Chlamydomonas sp. grown with 12¿mg¿L -1 ferric nitrate as an iron source when compared to other algae and iron salts. The time-course bioaccumulation confirmed that all the three microalgae adsorb the ferric salts such as ferric nitrate and ferric chloride more rapidly than ferrous salt, whereas intracellular accumulation was found to be rapid for ferrous salts. However, the amount of iron accumulated or adsorbed by algae, irrespective of species, from ferrous sulphate medium is comparatively lower than ferric chloride and ferric nitrate medium. The Fourier transform infrared spectroscopy (FTIR) analysis shows that the oxygen atom and P = O group of polysaccharides present in the cell wall of algae played a major role in the bioaccumulation of iron ions by algae.

DOI 10.1007/s10811-016-0837-0
Citations Scopus - 1
Co-authors Thava Palanisami, Megh Mallavarapu, Suresh Subashchandrabose, Ravi Naidu
2016 Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'Characterization of bimetallic Fe/Pd nanoparticles by grape leaf aqueous extract and identification of active biomolecules involved in the synthesis', SCIENCE OF THE TOTAL ENVIRONMENT, 562 526-532 (2016) [C1]
DOI 10.1016/j.scitotenv.2016.04.060
Citations Scopus - 3Web of Science - 3
Co-authors Megh Mallavarapu, Ravi Naidu
2016 Yirsaw BD, Mayilswami S, Megharaj M, Chen Z, Naidu R, 'Effect of zero valent iron nanoparticles to Eisenia fetida in three soil types', Environmental Science and Pollution Research, 23 9822-9831 (2016) [C1]

© 2016, Springer-Verlag Berlin Heidelberg. In this study, the influence of soil types on the effect of the commercial form of C-nZVI on tissue concentrations, cellular component,... [more]

© 2016, Springer-Verlag Berlin Heidelberg. In this study, the influence of soil types on the effect of the commercial form of C-nZVI on tissue concentrations, cellular component, reproduction outcome in Eisenia fetida, and the soil health was investigated. C-nZVI at concentration level of 3¿g¿kg -1 soil showed no effect on the survival of E. fetida in the three soil types. However, varying effects such as concentration-dependent increase in tissue iron concentration, lipid peroxidation, and damage to DNA molecules by C-nZVI were observed. C-nZVI at an exposure concentration of 60¿mg¿kg -1 soil induced oxidative stress in E. fetida. Tissue Fe concentration appeared correlated to the DNA damage. Oxidative stress and DNA damage may explain the toxicity mechanisms of nZVI to E. fetida. [Figure not available: see fulltext.].

DOI 10.1007/s11356-016-6193-4
Citations Scopus - 4Web of Science - 3
Co-authors Megh Mallavarapu, Ravi Naidu
2016 Luo F, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of trichloroethylene and hexavalent chromium by green synthesized agarose-Fe nanoparticles hydrogel', Chemical Engineering Journal, 294 290-297 (2016) [C1]

© 2016 Elsevier B.V. The development of highly efficient, eco-friendly and cost-effective remediation technology to remove mixed contaminants is now in progress. Here, agarose-Fe... [more]

© 2016 Elsevier B.V. The development of highly efficient, eco-friendly and cost-effective remediation technology to remove mixed contaminants is now in progress. Here, agarose-Fe nanoparticles (NPs) hydrogel were produced via two green steps to remove mixed contaminants, specifically trichloroethylene (TCE) and hexavalent chromium (Cr(VI)). Approx. 84.9% of Cr(VI) and 93.8% of TCE were simultaneously removed over 24 h in their co-existing solution, while 94.1% of Cr(VI) and 97.2% of TCE were separately removed by agarose-Fe NPs hydrogel. Scanning Electron Microscopy (SEM) suggested that the macroporosity of agarose-Fe NPs hydrogel facilitated the mass transfer between agarose-Fe NPs hydrogels and mixed contaminants, and that Fe NPs were uniformly immobilized into the hydrogel. X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) provided evidence supporting the co-removal mechanism. XPS result indicated that: (1) chemical reduction played a role in the removal of both Cr(VI) and TCE; and (2) iron oxides and Fe(III)-Cr(III) complexes might be formed after reaction. FTIR result showed that some functional groups were involved in the removal process. Moreover, the presence of iron oxides were confirmed by FTIR. Both SEM and XPS results verified that encapsulation could describe such immobilization of Fe NPs using agarose. Finally, the kinetics study supported the removal mechanism. Such encapsulation of Fe NPs via a green strategy is simple, quick, and cost-effective, making in situ remediation of mixed contaminants more favorable.

DOI 10.1016/j.cej.2016.03.005
Citations Scopus - 8Web of Science - 5
Co-authors Megh Mallavarapu, Ravi Naidu
2016 Jin X, Zhuang Z, Yu B, Chen Z, Chen Z, 'Functional chitosan-stabilized nanoscale zero-valent iron used to remove acid fuchsine with the assistance of ultrasound', Carbohydrate Polymers, 136 1085-1090 (2016) [C1]

© 2015 Elsevier Ltd. All rights reserved. Chitosan-stabilized nanoscale zero-valent iron (CS-nZVI) was prepared and used for the removal of acid fuchsine (AF) from aqueous soluti... [more]

© 2015 Elsevier Ltd. All rights reserved. Chitosan-stabilized nanoscale zero-valent iron (CS-nZVI) was prepared and used for the removal of acid fuchsine (AF) from aqueous solution with the assistance of ultrasound. More than 98.9% of AF was removed using CS-nZVI, aged CS-nZVI (exposed to air for 2 months), while only 14.6% removal efficiency was achieved after 15 min by chitosan alone with the assistance of ultrasound. Scanning electron microscopy (SEM) confirmed that chitosan polymers were arranged in a homocentric layered structure. Thus, the polymer can prevent the aggregation of nZVI and increase their anti-oxidation capacity. X-ray diffraction (XRD) also suggested that the chitosan used in synthesis may protect nZVI nanoparticles from air oxidation. Different factors impacting on the removal of AF using CS-nZVI showed that the reduction increased when dosage and temperature increased, but decreased when pH and initial concentration rose. Kinetic studies revealed that the removal of AF fitted well to the pseudo-first-order model. The apparent activation energy was 55.34 kJ/mol, indicating a chemically controlled reaction. Finally, the application of CS-nZVI in dyeing wastewater led to a removal efficiency of 99% of AF, while the reuse test confirmed that AF's removal efficiency declined from 99.6 to 39.3% after seven cycles.

DOI 10.1016/j.carbpol.2015.10.002
Citations Scopus - 9Web of Science - 9
2016 Weng X, Jin X, Lin J, Naidu R, Chen Z, 'Removal of mixed contaminants Cr(VI) and Cu(II) by green synthesized iron based nanoparticles', Ecological Engineering, 97 32-39 (2016) [C1]

© 2016 Elsevier B.V. In this study, iron based nanoparticles (Fe NPs) synthesized by eucalyptus leaf extracts was used to remove mixed Cr(VI) and Cu(II), where the efficiency was... [more]

© 2016 Elsevier B.V. In this study, iron based nanoparticles (Fe NPs) synthesized by eucalyptus leaf extracts was used to remove mixed Cr(VI) and Cu(II), where the efficiency was 58.9% and 33.0%, respectively. In contrast, only 20.2% of Cr(VI) and 11.8% of Cu(II) were removed by adsorption using eucalyptus leaf extracts. In addition, the removal mechanism for mixed Cr(VI) and Cu(II) based on both adsorption and reduction by Fe NPs was confirmed by various characterization techniques, including the formations of Fe NPs, iron oxides and capping layer. Furthermore, the kinetics suggested that firstly, their sorption followed the pseudo second-order model well; and secondly, reduction of Cr(VI) and Cu(II) followed the pseudo-first-order model well. Finally, Fe NPs not only removed Cr(VI) and Cu(II), but also Pb(II) and Zn(II) in electroplating wastewater. This provides a new insights into the removal of metal ions using green Fe NPs with a low cost and environmentally friendly remediation strategy.

DOI 10.1016/j.ecoleng.2016.08.003
Citations Scopus - 4Web of Science - 3
Co-authors Ravi Naidu
2016 Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'One-step green synthesis of bimetallic Fe/Pd nanoparticles used to degrade Orange II', Journal of Hazardous Materials, 303 145-153 (2016) [C1]

© 2015 Elsevier B.V. To reduce cost and enhance reactivity, bimetallic Fe/Pd nanoparticles (NPs) were firstly synthesized using grape leaf aqueous extract to remove Orange II. Gr... [more]

© 2015 Elsevier B.V. To reduce cost and enhance reactivity, bimetallic Fe/Pd nanoparticles (NPs) were firstly synthesized using grape leaf aqueous extract to remove Orange II. Green synthesized bimetallic Fe/Pd NPs (98.0%) demonstrated a far higher ability to remove Orange II in 12h compared to Fe NPs (16.0%). Meanwhile, all precursors, e.g., grape leaf extract, Fe 2+ and Pd 2+ , had no obvious effect on removing Orange II since less than 2.0% was removed. Kinetics study revealed that the removal rate fitted well to the pseudo-first-order reduction and pseudo-second-order adsorption model, meaning that removing Orange II via Fe/Pd NPs involved both adsorption and catalytic reduction. The remarkable stability of Fe/Pd NPs showed the potential application for removing azo dyes. Furthermore, Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) confirmed the changes in Fe/Pd NPs before and after reaction with Orange II. High Performance Liquid Chromatography-Mass Spectrum (HPLC-MS) identified the degraded products in the removal of Orange II, and finally a removal mechanism was proposed. This one-step strategy using grape leaf aqueous extract to synthesize Fe/Pd NPs is simple, cost-effective and environmentally benign, making possible the large-scale production of Fe/Pd NPs for field remediation.

DOI 10.1016/j.jhazmat.2015.10.034
Citations Scopus - 12Web of Science - 11
Co-authors Megh Mallavarapu, Ravi Naidu
2016 Gao Y, Wang F, Wu Y, Naidu R, Chen Z, 'Comparison of degradation mechanisms of microcystin-LR using nanoscale zero-valent iron (nZVI) and bimetallic Fe/Ni and Fe/Pd nanoparticles', Chemical Engineering Journal, 285 459-466 (2016) [C1]

© 2015 Elsevier B.V. Microcystin-LR (MC-LR) as a drinking water contaminant was degraded using iron-based nanoparticles such as nZVI, Fe/Ni and Fe/Pd. Batch experiments showed th... [more]

© 2015 Elsevier B.V. Microcystin-LR (MC-LR) as a drinking water contaminant was degraded using iron-based nanoparticles such as nZVI, Fe/Ni and Fe/Pd. Batch experiments showed that 28.0% of MC-LR with the initial concentration of 5mgL -1 was removed using nZVI, while more than 90% of MC-LR was removed using either bimetallic Fe/Ni or Fe/Pd after degrading for 120min. In addition, the results indicated that Fe 0 was oxided to iron oxide or hydroxide after reacting with MC-LR, while Ni or Pd acted as the catalysis to prevent Fe 0 corrosion and generating hydrogen via water reduction. Degradation of MC-LR by iron-based nanoparticles fitted well to the pseudo-first order kinetic model and the degradation was a diffusion-controlled reaction with low activation energies (8-21kJmol -1 ). Finally, the degradation mechanisms of MC-LR using iron-based nanoparticles were proposed according to the LC-MS analysis. In nZVI case, when the MC-LR was quickly adsorbed on nanoparticles, electron transfer and H 2 generated from iron corrosion were generated and broke down the Adda composition of MC-LR. Based on corrosion in the Fe 0 -H 2 O system, bimetallic Fe/Ni and Fe/Pd further utilized the abundant hydrogen radical decomposed from H 2 under the catalysis of Ni or Pd, and destroyed the Adda to form small molecules.

DOI 10.1016/j.cej.2015.09.078
Citations Scopus - 5Web of Science - 5
Co-authors Ravi Naidu
2016 Subramaniyam V, Subashchandrabose SR, Ganeshkumar V, Thavamani P, Chen Z, Naidu R, Megharaj M, 'Cultivation of Chlorella on brewery wastewater and nano-particle biosynthesis by its biomass', BIORESOURCE TECHNOLOGY, 211 698-703 (2016) [C1]
DOI 10.1016/j.biortech.2016.03.154
Citations Scopus - 4Web of Science - 4
Co-authors Thava Palanisami, Megh Mallavarapu, Ravi Naidu, Suresh Subashchandrabose
2016 Faustorilla MV, Chen Z, Dharmarajan R, Naidu R, 'Solid phase extraction and fractionation of total petroleum hydrocarbons in contaminated soil by GC-MSD/FID techniques', Journal of Chromatography and Separation Techniques, 7 87-87 (2016)
DOI 10.4172/2157-7064.C1.020
Co-authors Raja Dharmarajan, Ravi Naidu
2016 Cheng Y, Zhou F, Li S, Chen Z, 'Removal of mixed contaminants, crystal violet, and heavy metal ions by using immobilized stains as the functional biomaterial', RSC Advances, 6 67858-67865 (2016) [C1]

© 2016 The Royal Society of Chemistry. A new functional biomaterial based on Burkholderia vietnamiensis C09V (C09V) was immobilized on beads and used for simultaneous removal of ... [more]

© 2016 The Royal Society of Chemistry. A new functional biomaterial based on Burkholderia vietnamiensis C09V (C09V) was immobilized on beads and used for simultaneous removal of both heavy metals and crystal violet (CV). The results showed that removal of CV and metal ions using immobilized cell bead (biomaterial) was more efficient than that of free cells, wherein 89.4% of CV and 64.1% of Cu(ii) were removed after 42 h of using the biomaterial, whilst only 27.1% of CV and 23.9% of Cu(ii) were removed by free cells. Similar results were also observed in the CV and Cr(vi) removal. Fourier transform infrared spectroscopy (FTIR) revealed the change of functional groups in the presence of heavy metals. Scanning electron microscopy (SEM) showed that the existence of Cu(ii) and Cr(vi) affected the cellular morphology of the strain. X-ray energy-dispersive spectrometer (EDS) indicated that Cu(ii) and Cr(vi) adsorbed. Further Cr(vi) reduced to Cr(iii) was observed by X-ray photoelectron spectroscopy analysis (XPS). Finally, reusability and wastewater application were carried out, which shows that this functional material has a potential for co-removal of CV and heavy metals.

DOI 10.1039/c6ra13337a
Citations Scopus - 1
2016 Li Y, Fan Y, Chen Z, Cheng F, Guo Y, 'Chemical, Mineralogical, and Morphological Characteristics of Pidgeon Magnesium Slag', Environmental Engineering Science, 33 290-297 (2016)

Copyright © 2016 Mary Ann Liebert, Inc. Pidgeon magnesium slag (PMS) is produced during the production of metallic magnesium by the Pidgeon reduction process, and the disposal of... [more]

Copyright © 2016 Mary Ann Liebert, Inc. Pidgeon magnesium slag (PMS) is produced during the production of metallic magnesium by the Pidgeon reduction process, and the disposal of PMS causes serious environmental problems. In this study, the physicochemical characteristics and solubility of PMS were comprehensively investigated. Use of Fourier transform infrared to characterize PMS and the synthesis of a slow-release K fertilizers using PMS as raw material were reported for the first time. Major chemical composition of PMS was determined to be 52.57% CaO, 26.31% SiO 2 , 6.89% MgO, 1.44% Al 2 O 3 , and 3.32% Fe 2 O 3 . Major constituent phases were 23.6% ß-Ca 2 SiO 4 , 53.7% ¿-Ca 2 SiO 4 , 6.6% periclase, 4.5% free-CaO, and 11.6% the rest phase; minor phases were Ca(OH) 2 , Mg(OH) 2 , CaCO 3 , and MgCO 3 . PMS was bound within a stable crystalline phase, as occurs in natural ore deposits; heavy metal content and the average values of I Ra and I r of PMS were lower than the limit values of organic-inorganic compound fertilizer (GB 18877-2009) and national standard limit values (GB 6566-2010), respectively; hence, it could be reutilized safely. Fertilizer synthesized using PMS and K 2 CO 3 showed slow-release characteristics. Data obtained provide insight that may be helpful for finding alternative uses for PMS.

DOI 10.1089/ees.2015.0097
2016 Jin X, Yu B, Lin J, Chen Z, 'Integration of biodegradation and nano-oxidation for removal of PAHs from aqueous solution', ACS Sustainable Chemistry and Engineering, 4 4717-4723 (2016) [C1]

© 2016 American Chemical Society. Despite many reports being published on using biodegradation or Fenton-like oxidation to remove various containments, the integration of these t... [more]

© 2016 American Chemical Society. Despite many reports being published on using biodegradation or Fenton-like oxidation to remove various containments, the integration of these two processes to improve the removal efficiency of contaminants is still a challenge. This study attempted to remove naphthalene and phenanthrene from aqueous solution using a sequential biodegradation and Fenton-like oxidation based on green synthesis of iron nanoparticles (Fe NPs). Results showed that after 96 h, 100% naphthalene was biodegraded, whereas only 28.9% phenanthrene and 48.3% chemical oxygen demand (COD) were removed, respectively, indicating that the biodegradation was an incomplete process and the degraded metabolites still existed. To improve the removal efficiency of phenanthrene and the degraded metabolites, Fenton-like oxidation based on Fe NPs synthesized using tea extracts under various atmospheres (N 2 , O 2 and air) was employed. Results indicated 100% of phenanthrene was removed, total COD removed increased to 81.5%, 77.2% and 68.7% using N 2 , O 2 and air-Fe NPs, respectively. In addition, Fe NPs were confirmed by scanning electron microscopy (SEM) and X-ray energy-dispersive spectroscopy (EDS). Finally, the degraded metabolites were identified by GC-MS to understand the degradation pathway.

DOI 10.1021/acssuschemeng.6b00933
2016 Faustorilla M, Chen Z, Dharmarajan R, Naidu R, 'Solid phase extraction and fractionation of total petroleum hydrocarbons in contaminated soil by GC-MSD/FID techniques', Journal of Chromatography and Separation Techniques, 7 87-87 (2016)
DOI 10.4172/2157-7064.C1.020
Co-authors Ravi Naidu, Raja Dharmarajan
2016 Cao D, Jin X, Gan L, Wang T, Chen Z, 'Removal of phosphate using iron oxide nanoparticles synthesized by eucalyptus leaf extract in the presence of CTAB surfactant', Chemosphere, 159 23-31 (2016) [C1]

© 2016 Elsevier Ltd. This study investigated the use of cetyltrimethylammonium bromide (CTAB) as a stabilizer in green synthesis to improve the reactivity of iron oxide nanoparti... [more]

© 2016 Elsevier Ltd. This study investigated the use of cetyltrimethylammonium bromide (CTAB) as a stabilizer in green synthesis to improve the reactivity of iron oxide nanoparticles (IONP). Results show that efficiency in removing phosphate increased from 71.0% to 97.3%. To understand how to improve the reactivity of IONP by CTAB: firstly, characterizations of IONP before and after phosphate removal by SEM, EDS, FTIR, XPS show the adsorption of P onto the IONP; secondly, batch experiments indicate that the adsorption capacity of phosphate increased when temperature or initial phosphate concentration increased and decreased with an increase in both adsorbent dose and pH. Adsorption followed the pseudo-second-order kinetics model and the equilibrium data fitted well to the Langmuir isotherm. Thermodynamic data confirmed the spontaneous and endothermic nature of the adsorption process. Finally, it was proposed that the adsorption of phosphate using CTAB-modified IONP was mainly associated with inner-sphere complexing mechanism and electrostatic attraction.

DOI 10.1016/j.chemosphere.2016.05.080
Citations Scopus - 8Web of Science - 6
2016 Fang C, Chen Z, Megharaj M, Naidu R, 'Potentiometric detection of AFFFs based on MIP', Environmental Technology & Innovation, 5 52-59 (2016) [C1]
DOI 10.1016/j.eti.2015.12.003
Co-authors Cheng Fang, Megh Mallavarapu, Ravi Naidu
2016 Yirsaw BD, Megharaj M, Chen Z, Naidu R, 'Reduction of hexavalent chromium by green synthesized nano zero valent iron and process optimization using response surface methodology', Environmental Technology & Innovation, 5 136-147 (2016) [C1]
DOI 10.1016/j.eti.2016.01.005
Co-authors Megh Mallavarapu, Ravi Naidu
2016 Wang L, Fang C, Cheng Y, Lamb D, Chen Z, Megharaj M, Naidu R, 'A practical way to make solid-state reference electrodes', Journal of Bioanalytical Techniques, 1 1-5 (2016)
DOI 10.16966/jbt.101
Co-authors Dane Lamb, Ravi Naidu, Liang Wang, Megh Mallavarapu, Cheng Fang
2016 Chen Y, Yu B, Lin J, Naidu R, Chen Z, 'Simultaneous adsorption and biodegradation (SAB) of diesel oil using immobilized Acinetobacter venetianus on porous material', Chemical Engineering Journal, 289 463-470 (2016) [C1]

© 2016 Elsevier B.V. This paper investigated modified bamboo charcoal (MBC) as a cheap, abundant and alternative cell immobilization matrix for biodegrading diesel oil. The immob... [more]

© 2016 Elsevier B.V. This paper investigated modified bamboo charcoal (MBC) as a cheap, abundant and alternative cell immobilization matrix for biodegrading diesel oil. The immobilized microorganism's degradation capacity was compared to its free form counterparts, namely planktonic and immobilized bacteria which degraded relatively high amounts of diesel oil ( > 80%). Acinetobacter venetianus immobilized on MBC demonstrated superior efficiency in degrading diesel oil (94%) compared to planktonic cells culture (82%) over a 3-day period. Moreover, the simultaneous adsorption and biodegradation of diesel oil using these immobilized cells fitted well to the pseudo second order (R 2 > 0.99). Scanning electron microscopy (SEM) revealed that through absorption, cells attached well to the cavum of MBC stalk cells. Fourier transform infrared analysis (FTIR) revealed that a large number of bands at 1300-1500 cm - 1 existed, demonstrating that the diesel oil was degraded and new bands were formed. Gas Chromatography Mass Spectrum (GC-MS) analysis indicated the immobilized cells could degrade diesel oil into esters and aldehydes. Results justified the applicability of MBC as the carrier matrix for immobilizing microorganisms in removing diesel oil compounds from industrial wastewater.

DOI 10.1016/j.cej.2016.01.010
Citations Scopus - 6Web of Science - 6
Co-authors Ravi Naidu
2016 Liu E, Sarkar B, Chen Z, Naidu R, 'Decontamination of chlorine gas by organic amine modified copper-exchanged zeolite', Microporous and Mesoporous Materials, 225 450-455 (2016) [C1]

© 2016 Elsevier Inc. All rights reserved. Removal of chlorine gas (Cl 2 ) from air is of critical requirement in order to address point-source emissions possibly during a terrori... [more]

© 2016 Elsevier Inc. All rights reserved. Removal of chlorine gas (Cl 2 ) from air is of critical requirement in order to address point-source emissions possibly during a terrorist attack or an industrial accident resulting in Cl 2 contamination of the atmosphere. In this work, copper (Cu) exchanged zeolite Y (CuY) was functionalised with triethylenediamine (TEDA) and the capacity to remove Cl 2 was evaluated. The materials were characterised by nitrogen (N 2 ) adsorption-desorption studies, Fourier Transform Infrared (FTIR) spectroscopy and X-ray Photoelectron Spectroscopy (XPS). The materials' ability to remove Cl 2 was investigated via a dynamic breakthrough test. Copper exchanged zeolite displayed a low adsorption of Cl 2 in spite of its large surface area. However, Cl 2 removal greatly improved following functionalisation with TEDA. XPS analysis revealed that Cl 2 was removed via a catalytic hydrolysis reaction where adsorbed water vapour transformed Cl 2 into Cl - which could be further trapped in the zeolite structural framework. Moisture could increase the Cl 2 removal capacity, but the competition for adsorption between water and chlorine molecules was also observed. The spent adsorbent after exposure to Cl 2 could be easily recycled with an excessive water vapour treatment. The reusability was also investigated and the adsorbent could be used for more than five times. This material can potentially be used in air filters. It may provide an efficient way for decontaminating Cl 2 during a terrorist attack or an industrial accident.

DOI 10.1016/j.micromeso.2016.01.023
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu
2016 Wang L, Cheng Y, Lamb D, Chen Z, Lesniewski P, Mallavarapu M, Naidu R, 'Simultaneously determining multi-metal ions using an Ion Selective Electrode array system', Environmental Technology & Innovation, 6 165-176 (2016) [C1]
DOI 10.1016/j.eti.2016.10.001
Co-authors Ravi Naidu, Liang Wang, Dane Lamb, Megh Mallavarapu
2016 Wang FF, Wu Y, Gao Y, Li H, Chen Z, 'Effect of humic acid, oxalate and phosphate on Fenton-like oxidation of microcystin-LR by nanoscale zero-valent iron', Separation and Purification Technology, 170 337-343 (2016) [C1]

© 2016 Elsevier B.V. This study investigates the effect of humic acid, oxalate and phosphate on the heterogeneous Fenton-like oxidation efficiency of microcystin-LR (MC-LR) using... [more]

© 2016 Elsevier B.V. This study investigates the effect of humic acid, oxalate and phosphate on the heterogeneous Fenton-like oxidation efficiency of microcystin-LR (MC-LR) using zero-valent iron nanoparticles (nZVI) as a catalyst at neutral pH. The degradation efficiency of MC-LR in the Fenton-like system increases significantly from 59.1% to 78%, and 59.1% to 72.1% in the presence of humic acid and oxalate, respectively. These mean that humic acid and oxalate are able to form complexes with iron and iron oxide, thus promote the Fenton-like oxidation of MC-LR. However, the degradation efficiency reduces from 59.1% to 47.8% in the existence of phosphate, because phosphate adsorbs competitively with MC-LR to the nZVI surface, consequently inhibits the heterogeneous Fenton-like oxidation of MC-LR. The oxidation kinetics of MC-LR fits well with the pseudo first-order kinetic model. The results illustrate that humic acid was more effective than oxalate and phosphate to generate hydroxyl radicals. The surface changes of nZVI before and after reaction were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR).Magnetite, maghemite, lepidocrocite and other iron complexes were detected at nZVI surfaces after reaction with MC-LR.

DOI 10.1016/j.seppur.2016.06.046
Citations Scopus - 2Web of Science - 2
2016 Jin X, Zheng M, Sarkar B, Naidu R, Chen Z, 'Characterization of bentonite modified with humic acid for the removal of Cu (II) and 2,4-dichlorophenol from aqueous solution', Applied Clay Science, 134 89-94 (2016)

© 2016 Elsevier B.V. This study examines the modification of bentonite with humic acid (HAB) as a novel sorbent for simultaneous removal of Cu(II) and 2,4-dichlorophenol (2,4-DCP... [more]

© 2016 Elsevier B.V. This study examines the modification of bentonite with humic acid (HAB) as a novel sorbent for simultaneous removal of Cu(II) and 2,4-dichlorophenol (2,4-DCP) from aqueous solution. Batch experiments were conducted employing either single sorption or simultaneous sorption of Cu(II) and 2,4-DCP. Results indicated that the sorption of either Cu(II) or 2,4-DCP onto HAB was little influenced by the presence of the other contaminant. The amount of sorption was 22.40 mg g - 1 and 14.23 mg g - 1 for Cu(II) and 2,4-DCP, respectively at 30 °C. Scanning electron microscopy (SEM) indicated that HA was immobilized on the surface of bentonite. Energy dispersive spectroscopic (EDS) analysis indicated that Cu(II) was sorbed onto HAB. X-ray diffraction (XRD) analysis demonstrated that the crystalline structure of bentonite did not change after being modified with HA. Fourier-transform infrared (FTIR) spectra confirmed that new bonds and band intensity emerged after the sorption of Cu(II) and 2,4-DCP onto the HAB. These suggest that simultaneous sorption of 2,4-DCP and Cu(II) onto HAB could occur through: firstly, a mechanism that partitions between 2,4-DCP and HA; and secondly, the ion-exchange mechanism between Cu(II) and bentonite.

DOI 10.1016/j.clay.2016.09.036
Citations Scopus - 3Web of Science - 2
Co-authors Ravi Naidu
2015 Jin X, Chen Z, Zhou R, Chen Z, 'Synthesis of kaolin supported nanoscale zero-valent iron and its degradation mechanism of Direct Fast Black G in aqueous solution', MATERIALS RESEARCH BULLETIN, 61 433-438 (2015)
DOI 10.1016/j.materresbull.2014.10.057
Citations Scopus - 10Web of Science - 11
2015 Zhuang Z, Huang L, Wang F, Chen Z, 'Effects of cyclodextrin on the morphology and reactivity of iron-based nanoparticles using Eucalyptus leaf extract', INDUSTRIAL CROPS AND PRODUCTS, 69 308-313 (2015)
DOI 10.1016/j.indcrop.2015.02.027
Citations Scopus - 7Web of Science - 7
2015 Huang L, Zhou Y, Guo X, Chen Z, 'Simultaneous removal of 2,4-dichlorophenol and Pb(II) from aqueous solution using organoclays: Isotherm, kinetics and mechanism', JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 22 280-287 (2015)
DOI 10.1016/j.jiec.2014.07.021
Citations Scopus - 6Web of Science - 6
2015 Wu Y, Zeng S, Wang F, Megharaj M, Naidu R, Chen Z, 'Heterogeneous Fenton-like oxidation of malachite green by iron-based nanoparticles synthesized by tea extract as a catalyst', Separation and Purification Technology, 154 161-167 (2015) [C1]

© 2015 Elsevier B.V. All rights reserved. The green synthesis of functional iron nanoparticles (Fe NPs) by tea extracts was used as a catalyst for the Fenton-like oxidation of ma... [more]

© 2015 Elsevier B.V. All rights reserved. The green synthesis of functional iron nanoparticles (Fe NPs) by tea extracts was used as a catalyst for the Fenton-like oxidation of malachite green (MG), where more than 85% of MG was removed. The new findings are that the removal of MG by Fe NPs was based on the adsorption of MG onto iron oxide and degradation of MG by iron nanoparticles. This was confirmed by adsorption and degradation kinetics, indicating that: firstly, the adsorption kinetics follows the pseudo-first-order model; and secondly, degradation kinetics fitted well to the pseudo-second-order model. Morphology, size and changes in the Fe NPs surface were characterized using SEM, XRD, and FTIR techniques, showing that Fe < inf > 2 < /inf > O < inf > 3 < /inf > and Fe < inf > 3 < /inf > O < inf > 4 < /inf > was formed and green tea extract contained a high concentration of caffeine/polyphenols. It acted as both reducing and capping agents in the synthesis of Fe NPs. To further confirm the removal mechanism of MG by the functional Fe NPs, the degraded products were identified by FTIR and GC-MS analysis. Finally the mechanism of Fenton-like oxidation of MG based on both adsorption and degradation was proposed.

DOI 10.1016/j.seppur.2015.09.022
Citations Scopus - 8Web of Science - 7
Co-authors Megh Mallavarapu, Ravi Naidu
2015 Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'The mechanism for degrading Orange II based on adsorption and reduction by ion-based nanoparticles synthesized by grape leaf extract', JOURNAL OF HAZARDOUS MATERIALS, 296 37-45 (2015)
DOI 10.1016/j.jhazmat.2015.04.027
Citations Scopus - 15Web of Science - 11
Co-authors Ravi Naidu, Megh Mallavarapu
2015 Li R, Gao Y, Jin X, Chen Z, Megharaj M, Naidu R, 'Fenton-like oxidation of 2,4-DCP in aqueous solution using iron-based nanoparticles as the heterogeneous catalyst', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 438 87-93 (2015)
DOI 10.1016/j.jcis.2014.09.082
Citations Scopus - 22Web of Science - 18
Co-authors Megh Mallavarapu, Ravi Naidu
2015 Huang L, Luo F, Chen Z, Megharaj M, Naidu R, 'Green synthesized conditions impacting on the reactivity of Fe NPs for the degradation of malachite green', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 137 154-159 (2015)
DOI 10.1016/j.saa.2014.08.116
Citations Scopus - 10Web of Science - 12
Co-authors Megh Mallavarapu, Ravi Naidu
2015 Jiang C, Xu X, Megharaj M, Naidu R, Chen Z, 'Inhibition or promotion of biodegradation of nitrate by Paracoccus sp. in the presence of nanoscale zero-valent iron', Science of the Total Environment, 530-531 241-246 (2015)
DOI 10.1016/j.scitotenv.2015.05.044
Citations Scopus - 13Web of Science - 11
Co-authors Megh Mallavarapu, Ravi Naidu
2015 Zhuang Z, Wang F, Naidu R, Chen Z, 'Biosynthesis of Pd-Au alloys on carbon fiber paper: Towards an eco-friendly solution for catalysts fabrication', Journal of Power Sources, 291 132-137 (2015)
DOI 10.1016/j.jpowsour.2015.05.023
Citations Scopus - 12Web of Science - 10
Co-authors Ravi Naidu
2015 Subramaniyam V, Subashchandrabose SR, Thavamani P, Megharaj M, Chen Z, Naidu R, 'Chlorococcum sp. MM11¿a novel phyco-nanofactory for the synthesis of iron nanoparticles', Journal of Applied Phycology, 27 1861-1869 (2015)
DOI 10.1007/s10811-014-0492-2
Citations Scopus - 9Web of Science - 10
Co-authors Thava Palanisami, Megh Mallavarapu, Suresh Subashchandrabose, Ravi Naidu
2015 Yirsaw BD, Megharaj M, Chen Z, Naidu R, 'Environmental application and ecological significance of nano-zero valent iron', Journal of Environmental Sciences (China), 44 88-98 (2015)
DOI 10.1016/j.jes.2015.07.016
Citations Scopus - 4Web of Science - 3
Co-authors Ravi Naidu, Megh Mallavarapu
2015 Lin J, Gan L, Chen Z, Naidu R, 'Biodegradation of tetradecane using Acinetobacter venetianus immobilized on bagasse', Biochemical Engineering Journal, 100 76-82 (2015)
DOI 10.1016/j.bej.2015.04.014
Citations Scopus - 6Web of Science - 6
Co-authors Ravi Naidu
2015 Kuang Y, Du J, Zhou R, Chen Z, Megharaj M, Naidu R, 'Calcium alginate encapsulated Ni/Fe nanoparticles beads for simultaneous removal of Cu (II) and monochlorobenzene', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 447 85-91 (2015)
DOI 10.1016/j.jcis.2015.01.080
Citations Scopus - 15Web of Science - 15
Co-authors Jianhua Du, Megh Mallavarapu, Ravi Naidu
2015 Zeng S, Weng X, Tong Y, Lin W, Chen Z, 'Simultaneous removal of Pb (II) and Cd (II) from aqueous solution by green synthesized iron nanoparticles', Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae, 35 3538-3544 (2015)

© 2015, Science Press. All right reserved. Green synthesis of iron nanoparticles (Fe NPs) using plant extracts is one of the potential approaches in environmental remediation. Th... [more]

© 2015, Science Press. All right reserved. Green synthesis of iron nanoparticles (Fe NPs) using plant extracts is one of the potential approaches in environmental remediation. This study is aimed to investigate the removal efficiency of Pb(II) and Cd(II) using Fe NPs synthesized by Ilex latifolia leaf extracts and the effect of temperatures. The results showed that the decrease of removal efficiency of Pb (II) from 93.8% to 91.0% was observed when Cd (II) was present, while the removal efficiency of Cd (II) significantly decreased from 41.7% to 31.4% when Pb (II) was co-presented by a dosage of 2.0 g·L -1 Fe NPs (pH=3.5, 303 K) in 60 min. The removal kinetics of Pb(II) and Cd(II) followed a pseudo-first-order and a pseudo-second-order equation, respectively. Finally, on the basis of kinetics study and the characterization of Fe NPs before and after Pb(II) and Cd(II) removal, it was proposed that the removal of Pb (II) occurred through both adsorption and chemical reduction, while the removal of Cd(II) occurred through adsorption.

DOI 10.13671/j.hjkxxb.2015.0008
2015 Li C, Zhuang Z, Jin X, Chen Z, 'Coadsorption behavior of methylene blue and Cu(II) from aqueous solution on graphene oxide', Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae, 35 3163-3169 (2015)

© 2015, Science Press. All right reserved. Graphene oxide (GO), owing to its high specific surface area and oxygen-containing functional groups, has the potential as an efficient... [more]

© 2015, Science Press. All right reserved. Graphene oxide (GO), owing to its high specific surface area and oxygen-containing functional groups, has the potential as an efficient adsorbent to remove the contaminants from water, because of the abundant adsorption sites exiting on GO. However, only a few publications about the coadsorption behavior of heavy metal ions and organic pollutants on GO were reported. In this paper, GO was synthesized using the modified hummers method and was used for adsorption of heavy metal, organics and organics-heavy metals coexist pollutants from water. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), raman spectroscopy and X-ray powder diffraction (XRD) were employed for characterization of morphology and structure of GO to understand the adsorption mechanism. Methylene blue (MB) and Cu(II) were choosen as the model pollutants for studying adsorption behavior of GO. In mono-pollutant system, the maximum adsorption capacity of Cu(II) and MB was 29.13 mg·g -1 and 424.16 mg·g -1 , respectively. While both the adsorption capacity of Cu(II) and MB decreased in Cu(II)-MB binary system, indicating that the competitive adsorption of MB and Cu(II) greatly influences their adsorption behavior. These results revealed that MB has a far greater impact on GO adsorption performance than Cu(II).

DOI 10.13671/j.hjkxxb.2015.0536
2015 Li R, Jin X, Megharaj M, Naidu R, Chen Z, 'Heterogeneous Fenton oxidation of 2,4-dichlorophenol using iron-based nanoparticles and persulfate system', CHEMICAL ENGINEERING JOURNAL, 264 587-594 (2015)
DOI 10.1016/j.cej.2014.11.128
Citations Scopus - 46Web of Science - 44
Co-authors Ravi Naidu, Megh Mallavarapu
2015 Yu B, Jin X, Kuang Y, Megharaj M, Naidu R, Chen Z, 'An integrated biodegradation and nano-oxidation used for the remediation of naphthalene from aqueous solution', CHEMOSPHERE, 141 205-211 (2015) [C1]
DOI 10.1016/j.chemosphere.2015.07.050
Citations Scopus - 4Web of Science - 3
Co-authors Megh Mallavarapu, Ravi Naidu
2015 Wang L, Liu E, Cheng Y, Bekele DN, Lamb D, Chen Z, et al., 'Novel methodologies for automatically and simultaneously determining BTEX components using FTIR spectra', Talanta, 144 1104-1110 (2015) [C1]

© 2015 Elsevier B.V. This study introduced a patented novel methodological system for automatically analysis of Fourier Transform Infrared Spectrometer (FTIR) spectrum data locat... [more]

© 2015 Elsevier B.V. This study introduced a patented novel methodological system for automatically analysis of Fourier Transform Infrared Spectrometer (FTIR) spectrum data located at 'fingerprint' region (wavenumber 670-800 cm < sup > -1 < /sup > ), to simultaneously determinate multiple petroleum hydrocarbons (PHs) in real mixture samples. This system includes: an object oriented baseline correction; Band decomposition (curve fitting) method with mathematical optimization; and Artificial Neural Network (ANN) for determination, which is suitable for the characteristics of this IR regions, where the spectra are normally with low signal to noise ratio and high density of peaks. BTEX components are potentially lethal carcinogens and contained in many petroleum products. As a case study, six BTEX components were determinate automatically and simultaneously in mixture vapor samples. The robustness of the BTEX determination was validated using real petroleum samples, and the prediction results were compared with gas chromatography-mass spectrometry (GC-MS).

DOI 10.1016/j.talanta.2015.07.044
Citations Scopus - 2Web of Science - 1
Co-authors Dawit Bekele, Megh Mallavarapu, Liang Wang, Ravi Naidu, Dane Lamb
2015 Wang L, Yang D, Fang C, Chen Z, Lesniewski PJ, Mallavarapu M, Naidu R, 'Application of neural networks with novel independent component analysis methodologies to a Prussian blue modified glassy carbon electrode array', Talanta, 131 395-403 (2015)
DOI 10.1016/j.talanta.2014.08.010
Citations Scopus - 4Web of Science - 3
Co-authors Ravi Naidu, Liang Wang, Megh Mallavarapu, Cheng Fang
2015 Lin J, Weng X, Jin X, Megharaj M, Naidu R, Chen Z, 'Reactivity of iron-based nanoparticles by green synthesis under various atmospheres and their removal mechanism of methylene blue', RSC ADVANCES, 5 70874-70882 (2015) [C1]
DOI 10.1039/c5ra10629j
Citations Scopus - 5Web of Science - 6
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Lin J, He Y, Xu J, Chen Z, Brookes PC, 'Vertical Profiles of Pentachlorophenol and the Microbial Community in a Paddy Soil: Influence of Electron Donors and Acceptors', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 62 9974-9981 (2014)
DOI 10.1021/jf502746n
Citations Web of Science - 1
2014 Huang L, Yang D, Guo X, Chen Z, 'Speciation analysis of inorganic tin by on-column complexation ion chromatography with inductively coupled plasma mass spectrometry and electrospray mass spectrometry', JOURNAL OF CHROMATOGRAPHY A, 1368 217-221 (2014)
DOI 10.1016/j.chroma.2014.09.086
Citations Scopus - 6Web of Science - 6
2014 Jin X, Yu B, Chen Z, Arocena JM, Thring RW, 'Adsorption of Orange II dye in aqueous solution onto surfactant-coated zeolite: Characterization, kinetic and thermodynamic studies', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 435 15-20 (2014)
DOI 10.1016/j.jcis.2014.08.011
Citations Scopus - 33Web of Science - 28
2014 Li S, Pan X, Wallis LK, Fan Z, Chen Z, Diamond SA, 'Comparison of TiO2 nanoparticle and graphene-TiO2 nanoparticle composite phototoxicity to Daphnia magna and Oryzias latipes', CHEMOSPHERE, 112 62-69 (2014)
DOI 10.1016/j.chemosphere.2014.03.058
Citations Web of Science - 37
2014 Jin X, Zha S, Li S, Chen Z, 'Simultaneous removal of mixed contaminants by organoclays - Amoxicillin and Cu(II) from aqueous solution', APPLIED CLAY SCIENCE, 102 196-201 (2014)
DOI 10.1016/j.clay.2014.09.040
Citations Scopus - 11Web of Science - 10
2014 Sun Q, Cai X, Li J, Zheng M, Chen Z, Yu C-P, 'Green synthesis of silver nanoparticles using tea leaf extract and evaluation of their stability and antibacterial activity', COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 444 226-231 (2014)
DOI 10.1016/j.colsurfa.2013.12.065
Citations Scopus - 65Web of Science - 58
2014 Jin X, Jiang M, Du J, Chen Z, 'Removal of Cr(VI) from aqueous solution by surfactant-modified kaolinite', JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 20 3025-3032 (2014)
DOI 10.1016/j.jiec.2013.11.038
Citations Scopus - 15Web of Science - 16
Co-authors Jianhua Du
2014 Gan L, Cheng Y, Palanisami T, Chen Z, Megharaj M, Naidu R, 'Pathways of reductive degradation of crystal violet in wastewater using free-strain Burkholderia vietnamiensis C09V', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 21 10339-10348 (2014)
DOI 10.1007/s11356-014-3037-y
Citations Scopus - 4Web of Science - 4
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Wang T, Lin J, Chen Z, Megharaj M, Naidu R, 'Green synthesized iron nanoparticles by green tea and eucalyptus leaves extracts used for removal of nitrate in aqueous solution', JOURNAL OF CLEANER PRODUCTION, 83 413-419 (2014)
DOI 10.1016/j.jclepro.2014.07.006
Citations Scopus - 44Web of Science - 40
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Luo F, Chen Z, Megharaj M, Naidu R, 'Biomolecules in grape leaf extract involved in one-step synthesis of iron-based nanoparticles', RSC ADVANCES, 4 53467-53474 (2014)
DOI 10.1039/c4ra08808e
Citations Scopus - 12Web of Science - 10
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Shi L, Du J, Chen Z, Megharaj M, Naidu R, 'Functional kaolinite supported Fe/Ni nanoparticles for simultaneous catalytic remediation of mixed contaminants (lead and nitrate) from wastewater', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 428 302-307 (2014)
DOI 10.1016/j.jcis.2014.04.059
Citations Scopus - 5Web of Science - 5
Co-authors Megh Mallavarapu, Jianhua Du, Ravi Naidu
2014 Weng X, Sun Q, Lin S, Chen Z, Megharaj M, Naidu R, 'Enhancement of catalytic degradation of amoxicillin in aqueous solution using clay supported bimetallic Fe/Ni nanoparticles', CHEMOSPHERE, 103 80-85 (2014)
DOI 10.1016/j.chemosphere.2013.11.033
Citations Scopus - 19Web of Science - 19
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Liu Y, Li S, Chen Z, Megharaj M, Naidu R, 'Influence of zero-valent iron nanoparticles on nitrate removal by Paracoccus sp.', CHEMOSPHERE, 108 426-432 (2014)
DOI 10.1016/j.chemosphere.2014.02.045
Citations Scopus - 20Web of Science - 18
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Green synthesis of Fe nanoparticles using eucalyptus leaf extracts for treatment of eutrophic wastewater', SCIENCE OF THE TOTAL ENVIRONMENT, 466 210-213 (2014)
DOI 10.1016/j.scitotenv.2013.07.022
Citations Scopus - 75Web of Science - 58
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Jin X, Chen Z, Wang T, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of co-contaminants: acid brilliant violet and Cu2+ by functional bimetallic Fe/Pd nanoparticles', JOURNAL OF NANOPARTICLE RESEARCH, 16 (2014)
DOI 10.1007/s11051-014-2657-y
Citations Scopus - 1
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Zhou F, Cheng Y, Gan L, Chen Z, Megharaj M, Naidu R, 'Burkholderia vietnamiensis C09V as the functional biomaterial used to remove crystal violet and Cu(II)', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 105 1-6 (2014)
DOI 10.1016/j.ecoenv.2014.03.028
Citations Scopus - 4Web of Science - 4
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Lin Y, Chen Z, Chen Z, Megharaj M, Naidu R, 'Decoloration of acid violet red B by bentonite-supported nanoscale zero-valent iron: Reactivity, Characterization, kinetics and reaction pathway', APPLIED CLAY SCIENCE, 93-94 56-61 (2014)
DOI 10.1016/j.clay.2014.02.020
Citations Scopus - 18Web of Science - 17
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Weng X, Chen Z, Chen Z, Megharaj M, Naidu R, 'Clay supported bimetallic Fe/Ni nanoparticles used for reductive degradation of amoxicillin in aqueous solution: Characterization and kinetics', COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 443 404-409 (2014)
DOI 10.1016/j.colsurfa.2013.11.047
Citations Scopus - 13Web of Science - 11
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Liu X, Wang F, Chen Z, Megharaj M, Naidu R, 'Heterogeneous Fenton oxidation of Direct Black G in dye effluent using functional kaolin-supported nanoscale zero iron', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 21 1936-1943 (2014)
DOI 10.1007/s11356-013-2099-6
Citations Scopus - 1Web of Science - 2
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of Pb(II) and Cr(III) by magnetite nanoparticles using various synthesis conditions', JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 20 3543-3549 (2014)
DOI 10.1016/j.jiec.2013.12.047
Citations Scopus - 18Web of Science - 15
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Lin C, Gan L, Chen Z, Megharaj M, Naidu R, 'Biodegradation of naphthalene using a functional biomaterial based on immobilized Bacillus fusiformis (BFN)', BIOCHEMICAL ENGINEERING JOURNAL, 90 1-7 (2014)
DOI 10.1016/j.bej.2014.05.003
Citations Scopus - 7Web of Science - 5
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Du J, Chadalavada S, Chen Z, Naidu R, 'Environmental remediation techniques of tributyltin contamination in soil and water: A review', CHEMICAL ENGINEERING JOURNAL, 235 141-150 (2014)
DOI 10.1016/j.cej.2013.09.044
Citations Scopus - 20Web of Science - 16
Co-authors Jianhua Du, Ravi Naidu
2014 Cai X, Gao Y, Sun Q, Chen Z, Megharaj M, Naidu R, 'Removal of co-contaminants Cu (II) and nitrate from aqueous solution using kaolin-Fe/Ni nanoparticles', CHEMICAL ENGINEERING JOURNAL, 244 19-26 (2014)
DOI 10.1016/j.cej.2014.01.040
Citations Scopus - 17Web of Science - 17
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Wang F, Gao Y, Sun Q, Chen Z, Megharaj M, Naidu R, 'Degradation of microcystin-LR using functional clay supported bimetallic Fe/Pd nanoparticles based on adsorption and reduction', CHEMICAL ENGINEERING JOURNAL, 255 55-62 (2014)
DOI 10.1016/j.cej.2014.06.003
Citations Scopus - 5Web of Science - 5
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Zha S, Cheng Y, Gao Y, Chen Z, Megharaj M, Naidu R, 'Nanoscale zero-valent iron as a catalyst for heterogeneous Fenton oxidation of amoxicillin', CHEMICAL ENGINEERING JOURNAL, 255 141-148 (2014)
DOI 10.1016/j.cej.2014.06.057
Citations Scopus - 43Web of Science - 40
Co-authors Megh Mallavarapu, Ravi Naidu
2014 Huang L, Weng X, Chen Z, Megharaj M, Naidu R, 'Synthesis of iron-based nanoparticles using oolong tea extract for the degradation of malachite green', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 117 801-804 (2014)
DOI 10.1016/j.saa.2013.09.054
Citations Scopus - 39Web of Science - 28
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Huang L, Weng X, Chen Z, Megharaj M, Naidu R, 'Green synthesis of iron nanoparticles by various tea extracts: Comparative study of the reactivity', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 130 295-301 (2014)
DOI 10.1016/j.saa.2014.04.037
Citations Scopus - 33Web of Science - 31
Co-authors Ravi Naidu, Megh Mallavarapu
2014 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Voltammetric Determination of Lead (II) and Cadmium (II) Using a Bismuth Film Electrode Modified with Mesoporous Silica Nanoparticles', Electrochimica Acta, 132 223-229 (2014)
DOI 10.1016/j.electacta.2014.03.147
Citations Scopus - 32Web of Science - 27
Co-authors Megh Mallavarapu, Liang Wang, Ravi Naidu
2014 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Anodic stripping voltammetric determination of traces of Pb(II) and Cd(II) using a glassy carbon electrode modified with bismuth nanoparticles', Microchimica Acta, 181 1199-1206 (2014)
DOI 10.1007/s00604-014-1235-4
Citations Scopus - 13Web of Science - 13
Co-authors Ravi Naidu, Megh Mallavarapu, Liang Wang
2014 Wang L, Yang D, Chen Z, Lesniewski PJ, Naidu R, 'Application of neural networks with novel independent component analysis methodologies for the simultaneous determination of cadmium, copper, and lead using an ISE array', Journal of Chemometrics, 28 491-498 (2014)
DOI 10.1002/cem.2599
Citations Scopus - 5Web of Science - 4
Co-authors Ravi Naidu, Liang Wang
2014 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Determination of Trace Lead and Cadmium in Water Samples by Anodic Stripping Voltammetry with a Nafion-Ionic Liquid-Coated Bismuth Film Electrode', Electroanalysis, 26 639-647 (2014)
DOI 10.1002/elan.201300622
Citations Scopus - 8Web of Science - 7
Co-authors Ravi Naidu, Megh Mallavarapu, Liang Wang
2013 Chen Z, Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Multifunctional kaolinite-supported nanoscale zero-valent iron used for the adsorption and degradation of crystal violet in aqueous solution', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 398 59-66 (2013)
DOI 10.1016/j.jcis.2013.02.020
Citations Scopus - 66Web of Science - 60
Co-authors Megh Mallavarapu, Ravi Naidu
2013 Kuang Y, Wang Q, Chen Z, Megharaj M, Naidu R, 'Heterogeneous Fenton-like oxidation of monochlorobenzene using green synthesis of iron nanoparticles', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 410 67-73 (2013)
DOI 10.1016/j.jcis.2013.08.020
Citations Scopus - 73Web of Science - 67
Co-authors Megh Mallavarapu, Ravi Naidu
2013 Jiang C, Liu Y, Chen Z, Megharaj M, Naidu R, 'Impact of iron-based nanoparticles on microbial denitrification by Paracoccus sp. strain YF1', AQUATIC TOXICOLOGY, 142 329-335 (2013)
DOI 10.1016/j.aquatox.2013.09.005
Citations Scopus - 7Web of Science - 7
Co-authors Megh Mallavarapu, Ravi Naidu
2013 Lin H, Chen Z, Megharaj M, Naidu R, 'Biodegradation of TNT using Bacillus mycoides immobilized in PVA-sodium alginate-kaolin', APPLIED CLAY SCIENCE, 83-84 336-342 (2013)
DOI 10.1016/j.clay.2013.08.004
Citations Scopus - 14Web of Science - 11
Co-authors Megh Mallavarapu, Ravi Naidu
2013 Wang T, Su J, Jin X, Chen Z, Megharaj M, Naidu R, 'Functional clay supported bimetallic nZVI/Pd nanoparticles used for removal of methyl orange from aqueous solution', JOURNAL OF HAZARDOUS MATERIALS, 262 819-825 (2013)
DOI 10.1016/j.jhazmat.2013.09.028
Citations Scopus - 24Web of Science - 21
Co-authors Megh Mallavarapu, Ravi Naidu
2013 Weng X, Huang L, Chen Z, Megharaj M, Naidu R, 'Synthesis of iron-based nanoparticles by green tea extract and their degradation of malachite', INDUSTRIAL CROPS AND PRODUCTS, 51 342-347 (2013)
DOI 10.1016/j.indcrop.2013.09.024
Citations Scopus - 42Web of Science - 33
Co-authors Ravi Naidu, Megh Mallavarapu
2013 Shi L-N, Zhou Y, Chen Z, Megharaj M, Naidu R, 'Simultaneous adsorption and degradation of Zn2+ and Cu2+ from wastewaters using nanoscale zero-valent iron impregnated with clays', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 20 3639-3648 (2013)
DOI 10.1007/s11356-012-1272-7
Citations Scopus - 13Web of Science - 11
Co-authors Ravi Naidu, Megh Mallavarapu
2013 Kuang Y, Zhou Y, Chen Z, Megharaj M, Naidu R, 'Impact of Fe and Ni/Fe nanoparticles on biodegradation of phenol by the strain Bacillus fusiformis (BFN) at various pH values', BIORESOURCE TECHNOLOGY, 136 588-594 (2013)
DOI 10.1016/j.biortech.2013.03.018
Citations Scopus - 13Web of Science - 14
Co-authors Ravi Naidu, Megh Mallavarapu
2013 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Investigation of Copper(II) Interference on the Anodic Stripping Voltammetry of Lead(II) and Cadmium(II) at Bismuth Film Electrode', ELECTROANALYSIS, 25 2637-2644 (2013)
DOI 10.1002/elan.201300375
Citations Scopus - 19Web of Science - 19
Co-authors Megh Mallavarapu, Ravi Naidu, Liang Wang
2013 Zhou Y, Kuang Y, Li W, Chen Z, Megharaj M, Naidu R, 'A combination of bentonite-supported bimetallic Fe/Pd nanoparticles and biodegradation for the remediation of p-chlorophenol in wastewater', CHEMICAL ENGINEERING JOURNAL, 223 68-75 (2013)
DOI 10.1016/j.cej.2013.02.118
Citations Scopus - 18Web of Science - 15
Co-authors Megh Mallavarapu, Ravi Naidu
2013 Liu X, Chen Z, Chen Z, Megharaj M, Naidu R, 'Remediation of Direct Black G in wastewater using kaolin-supported bimetallic Fe/Ni nanoparticles', CHEMICAL ENGINEERING JOURNAL, 223 764-771 (2013)
DOI 10.1016/j.cej.2013.03.002
Citations Scopus - 20Web of Science - 22
Co-authors Megh Mallavarapu, Ravi Naidu
2013 Zha SX, Zhou Y, Jin X, Chen Z, 'The removal of amoxicillin from wastewater using organobentonite', JOURNAL OF ENVIRONMENTAL MANAGEMENT, 129 569-576 (2013)
DOI 10.1016/j.jenvman.2013.08.032
Citations Scopus - 28Web of Science - 24
2013 Sun Q, Zhang M, Yuan D, Chen Z, Gu C, 'Determination of nine emerging pesticides at trace level in aqueous samples using fully automated on-line solid phase extraction coupled with liquid chromatography-mass spectrometry', INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, 93 970-983 (2013)
DOI 10.1080/03067319.2012.717270
Citations Scopus - 1Web of Science - 1
2013 Lin H-Y, Yu C-P, Chen Z-L, 'Aerobic and anaerobic biodegradation of TNT by newly isolated Bacillus mycoides', ECOLOGICAL ENGINEERING, 52 270-277 (2013)
DOI 10.1016/j.ecoleng.2012.11.004
Citations Scopus - 13Web of Science - 8
2013 Weng X, Lin S, Zhong Y, Chen Z, 'Chitosan stabilized bimetallic Fe/Ni nanoparticles used to remove mixed contaminants-amoxicillin and Cd (II) from aqueous solutions', CHEMICAL ENGINEERING JOURNAL, 229 27-34 (2013)
DOI 10.1016/j.cej.2013.05.096
Citations Scopus - 44Web of Science - 42
2013 Wen Y-M, Cheng Y, Tang C, Chen Z-L, 'Bioleaching of heavy metals from sewage sludge using indigenous iron-oxidizing microorganisms', JOURNAL OF SOILS AND SEDIMENTS, 13 166-175 (2013)
DOI 10.1007/s11368-012-0580-3
Citations Scopus - 13Web of Science - 6
2012 Lin Y, Chen Z, Megharaj M, Naidu R, 'Degradation of scarlet 4BS in aqueous solution using bimetallic Fe/Ni nanoparticles', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 381 30-35 (2012)
DOI 10.1016/j.jcis.2012.05.035
Citations Scopus - 19Web of Science - 16
Co-authors Ravi Naidu, Megh Mallavarapu
2012 Choppala GK, Bolan NS, Megharaj M, Chen Z, Naidu R, 'The Influence of Biochar and Black Carbon on Reduction and Bioavailability of Chromate in Soils', JOURNAL OF ENVIRONMENTAL QUALITY, 41 1175-1184 (2012)
DOI 10.2134/jeq2011.0145
Citations Scopus - 44Web of Science - 40
Co-authors Nanthi Bolan, Ravi Naidu, Megh Mallavarapu
2012 Cheng Y, Lin H, Chen Z, Megharaj M, Naidu R, 'Biodegradation of crystal violet using Burkholderia vietnamiensis C09V immobilized on PVA-sodium alginate-kaolin gel beads', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 83 108-114 (2012)
DOI 10.1016/j.ecoenv.2012.06.017
Citations Scopus - 31Web of Science - 24
Co-authors Megh Mallavarapu, Ravi Naidu
2012 Liu Y, Gan L, Chen Z, Megharaj M, Naidu R, 'Removal of nitrate using Paracoccus sp YF1 immobilized on bamboo carbon', JOURNAL OF HAZARDOUS MATERIALS, 229 419-425 (2012)
DOI 10.1016/j.jhazmat.2012.06.029
Citations Scopus - 21Web of Science - 16
Co-authors Megh Mallavarapu, Ravi Naidu
2012 Naidu R, Nandy S, Megharaj M, Kumar RP, Chadalavada S, Chen Z, Bowman M, 'Monitored natural attenuation of a long-term petroleum hydrocarbon contaminated sites: a case study', BIODEGRADATION, 23 881-895 (2012)
DOI 10.1007/s10532-012-9580-7
Citations Scopus - 11Web of Science - 7
Co-authors Ravi Naidu, Megh Mallavarapu
2012 Chen Z-X, Cheng Y, Chen Z, Megharaj M, Naidu R, 'Kaolin-supported nanoscale zero-valent iron for removing cationic dye-crystal violet in aqueous solution', JOURNAL OF NANOPARTICLE RESEARCH, 14 (2012)
DOI 10.1007/s11051-012-0899-0
Citations Scopus - 22Web of Science - 21
Co-authors Ravi Naidu, Megh Mallavarapu
2012 Li Z-S, Lin S, Chen Z-L, Shi Y-D, Huang X-M, 'In situ electro-deposition of Pt micro-nano clusters on the surface of {[PMo12O40](3-)/PAMAM}(n) multilayer composite films and their electrocatalytic activities regarding methanol oxidation', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 368 413-419 (2012)
DOI 10.1016/j.jcis.2011.10.080
Citations Scopus - 17Web of Science - 18
2012 Wen Y-M, Wang Q-P, Tang C, Chen Z-L, 'Bioleaching of heavy metals from sewage sludge by Acidithiobacillus thiooxidans-a comparative study', JOURNAL OF SOILS AND SEDIMENTS, 12 900-908 (2012)
DOI 10.1007/s11368-012-0520-2
Citations Scopus - 8Web of Science - 5
2011 Sun Q, Chen Z, Yuan D, Yu C-P, Mallavarapu M, Naidu R, 'On-Line SPE Coupled with LC-APCI-MS for the Determination of Trace Explosives in Water', CHROMATOGRAPHIA, 73 631-637 (2011)
DOI 10.1007/s10337-011-1964-z
Citations Scopus - 8Web of Science - 8
Co-authors Megh Mallavarapu, Ravi Naidu
2011 Su J, Lin S, Chen Z, Megharaj M, Naidu R, 'Dechlorination of p-chlorophenol from aqueous solution using bentonite supported Fe/Pd nanoparticles: Synthesis, characterization and kinetics', DESALINATION, 280 167-173 (2011)
DOI 10.1016/j.desal.2011.06.067
Citations Scopus - 60Web of Science - 52
Co-authors Ravi Naidu, Megh Mallavarapu
2011 Chen Z-X, Jin X-Y, Chen Z, Megharaj M, Naidu R, 'Removal of methyl orange from aqueous solution using bentonite-supported nanoscale zero-valent iron', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 363 601-607 (2011)
DOI 10.1016/j.jcis.2011.07.057
Citations Scopus - 110Web of Science - 100
Co-authors Ravi Naidu, Megh Mallavarapu
2011 Shanmuganathan D, Megharaj M, Chen Z, Naidu R, 'Polybrominated diphenyl ethers (PBDEs) in marine foodstuffs in Australia: Residue levels and contamination status of PBDEs', MARINE POLLUTION BULLETIN, 63 154-159 (2011)
DOI 10.1016/j.marpolbul.2011.06.002
Citations Scopus - 23Web of Science - 22
Co-authors Ravi Naidu, Megh Mallavarapu
2011 Zhang X, Lin S, Chen Z, Megharaj M, Naidu R, 'Kaolinite-supported nanoscale zero-valent iron for removal of Pb2+ from aqueous solution: Reactivity, characterization and mechanism', WATER RESEARCH, 45 3481-3488 (2011)
DOI 10.1016/j.watres.2011.04.010
Citations Scopus - 160Web of Science - 134
Co-authors Megh Mallavarapu, Ravi Naidu
2011 Tan C-Y, Li M, Lin Y-M, Lu X-Q, Chen Z-L, 'Biosorption of Basic Orange from aqueous solution onto dried A. filiculoides biomass: Equilibrium, kinetic and FTIR studies', DESALINATION, 266 56-62 (2011)
DOI 10.1016/j.desal.2010.08.002
Citations Scopus - 48Web of Science - 39
2011 Su J, Lin H-F, Wang Q-P, Xie Z-M, Chen Z-L, 'Adsorption of phenol from aqueous solutions by organomontmorillonite', DESALINATION, 269 163-169 (2011)
DOI 10.1016/j.desal.2010.10.056
Citations Scopus - 47Web of Science - 41
2011 Shi L-N, Zhang X, Chen Z-L, 'Removal of Chromium (VI) from wastewater using bentonite-supported nanoscale zero-valent iron', WATER RESEARCH, 45 886-892 (2011)
DOI 10.1016/j.watres.2010.09.025
Citations Scopus - 273Web of Science - 243
2011 He Q-X, Huang X-C, Chen Z-L, 'Influence of organic acids, complexing agents and heavy metals on the bioleaching of iron from kaolin using Fe(III)-reducing bacteria', APPLIED CLAY SCIENCE, 51 478-483 (2011)
DOI 10.1016/j.clay.2011.01.012
Citations Scopus - 20Web of Science - 20
2011 Su J, Huang H-G, Jin X-Y, Lu X-Q, Chen Z-L, 'Synthesis, characterization and kinetic of a surfactant-modified bentonite used to remove As(III) and As(V) from aqueous solution', JOURNAL OF HAZARDOUS MATERIALS, 185 63-70 (2011)
DOI 10.1016/j.jhazmat.2010.08.122
Citations Scopus - 52Web of Science - 48
2011 Wang Q-P, Chen Z-L, Chen G-N, Lin J-M, 'Simultaneous determination of phosphate and calcium in river water samples by capillary zone electrophoresis with UV detection', INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, 91 255-262 (2011)
DOI 10.1080/03067310902999157
Citations Scopus - 7Web of Science - 7
2011 Tan C-Y, Shan X-Q, Xu G-Z, Lin Y-M, Chen Z-L, 'Phytoaccumulation of cadmium through Azolla from aqueous solution', ECOLOGICAL ENGINEERING, 37 1942-1946 (2011)
DOI 10.1016/j.ecoleng.2011.01.010
Citations Scopus - 2Web of Science - 2
2011 Zhou Y, Jin X-Y, Lin H, Chen Z-L, 'Synthesis, characterization and potential application of organobentonite in removing 2,4-DCP from industrial wastewater', CHEMICAL ENGINEERING JOURNAL, 166 176-183 (2011)
DOI 10.1016/j.cej.2010.10.058
Citations Scopus - 31Web of Science - 28
2011 Shi L-N, Lin Y-M, Zhang X, Chen Z-L, 'Synthesis, characterization and kinetics of bentonite supported nZVI for the removal of Cr(VI) from aqueous solution', CHEMICAL ENGINEERING JOURNAL, 171 612-617 (2011)
DOI 10.1016/j.cej.2011.04.038
Citations Scopus - 80Web of Science - 68
2010 Wang W, Chen Z, Davey DE, Naidu R, 'SPECIATION OF SELENIUM IN BIOLOGICAL SAMPLES BY ION CHROMATOGRAPHY WITH INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 33 1151-1173 (2010)
DOI 10.1080/10826076.2010.484363
Citations Scopus - 4Web of Science - 3
2010 Sun Q, Yuan D, Chen Z, Megharaj M, Naidu R, 'Reduction of polyatomic interferences during ion-chromatographic speciation of metal ions via their EDTA complexes along with ICP-MS detection using an octopole reaction system', MICROCHIMICA ACTA, 169 41-47 (2010)
DOI 10.1007/s00604-010-0311-7
Citations Scopus - 2Web of Science - 3
Co-authors Ravi Naidu, Megh Mallavarapu
2010 Guo M-R, He Q-X, Li Y-M, Lu X-Q, Chen Z-L, 'REMOVAL OF Fe FROM KAOLIN USING DISSIMILATORY Fe(III)-REDUCING BACTERIA', CLAYS AND CLAY MINERALS, 58 515-521 (2010)
DOI 10.1346/CCMN.2010.0580406
Citations Scopus - 6Web of Science - 7
2010 Jiang M-Q, Jin X-Y, Lu X-Q, Chen Z-L, 'Adsorption of Pb(II), Cd(II), Ni(II) and Cu(II) onto natural kaolinite clay', DESALINATION, 252 33-39 (2010)
DOI 10.1016/j.desal.2009.11.005
Citations Scopus - 213Web of Science - 187
2010 Guo M-R, Lin Y-M, Xu X-P, Chen Z-L, 'Bioleaching of iron from kaolin using Fe(III)-reducing bacteria with various carbon nitrogen sources', APPLIED CLAY SCIENCE, 48 379-383 (2010)
DOI 10.1016/j.clay.2010.01.010
Citations Scopus - 17Web of Science - 15
2010 Lin C, Gan L, Chen Z-L, 'Biodegradation of naphthalene by strain Bacillus fusiformis (BFN)', JOURNAL OF HAZARDOUS MATERIALS, 182 771-777 (2010)
DOI 10.1016/j.jhazmat.2010.06.101
Citations Scopus - 65Web of Science - 60
2010 Tan C-Y, Li G, Lu X-Q, Chen Z-L, 'Biosorption of Basic Orange using dried A. filiculoides', ECOLOGICAL ENGINEERING, 36 1333-1340 (2010)
DOI 10.1016/j.ecoleng.2010.06.009
Citations Scopus - 24Web of Science - 17
2010 Chen Z-L, Jin X-Y, Gan L, 'Identification of Fe-polycarboxylic complexes by electrospray ionization mass spectrometry and reduction of interferences by ion chromatography/inductively coupled plasma mass spectrometry with an octopole reaction system', RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 24 2993-2998 (2010)
DOI 10.1002/rcm.4737
Citations Scopus - 2Web of Science - 1
2010 Zhang X, Lin Y-M, Shan X-Q, Chen Z-L, 'Degradation of 2,4,6-trinitrotoluene (TNT) from explosive wastewater using nanoscale zero-valent iron', CHEMICAL ENGINEERING JOURNAL, 158 566-570 (2010)
DOI 10.1016/j.cej.2010.01.054
Citations Scopus - 65Web of Science - 49
2010 Zhang X, Lin S, Lu X-Q, Chen Z-L, 'Removal of Pb(II) from water using synthesized kaolin supported nanoscale zero-valent iron', CHEMICAL ENGINEERING JOURNAL, 163 243-248 (2010)
DOI 10.1016/j.cej.2010.07.056
Citations Scopus - 118Web of Science - 107
2009 Wang W, Chen Z, Davey DE, Naidu R, 'Extraction of selenium species in pharmaceutical tablets using enzymatic and chemical methods', MICROCHIMICA ACTA, 165 167-172 (2009)
DOI 10.1007/s00604-008-0115-1
Citations Scopus - 13Web of Science - 9
Co-authors Ravi Naidu
2009 Chen Z, He W, Beer M, Megharaj M, Naidu R, 'Speciation of glyphosate, phosphate and aminomethylphosphonic acid in soil extracts by ion chromatography with inductively coupled plasma mass spectrometry with an octopole reaction system', TALANTA, 78 852-856 (2009)
DOI 10.1016/j.talanta.2008.12.052
Citations Scopus - 27Web of Science - 24
Co-authors Megh Mallavarapu, Ravi Naidu
2009 Rahman MM, Chen Z, Naidu R, 'Extraction of arsenic species in soils using microwave-assisted extraction detected by ion chromatography coupled to inductively coupled plasma mass spectrometry', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 93-102 (2009)
DOI 10.1007/s10653-008-9227-0
Citations Scopus - 23Web of Science - 19
Co-authors Ravi Naidu, Mahmud Rahman
2009 Rahman F, Chen Z, Naidu R, 'A comparative study of the extractability of arsenic species from silverbeet and amaranth vegetables', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 103-113 (2009)
DOI 10.1007/s10653-008-9225-2
Citations Scopus - 16Web of Science - 14
Co-authors Ravi Naidu
2009 Chen Z, Owen G, Megharaj M, Naidu R, 'Speciation of Zn-aminopolycarboxylic complexes by electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry', RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 23 419-424 (2009)
DOI 10.1002/rcm.3897
Citations Scopus - 7Web of Science - 6
Co-authors Megh Mallavarapu, Ravi Naidu
2009 Sun Q, Chen Z, Yuan D, Megharaj M, Naidu R, 'On-line solid-phase extraction coupled with liquid chromatography/electrospray ionization mass spectrometry for the determination of trace tributyltin and triphenyltin in water samples', RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 23 3795-3802 (2009)
DOI 10.1002/rcm.4321
Citations Scopus - 7Web of Science - 6
Co-authors Ravi Naidu, Megh Mallavarapu
2009 Chen Z, Jin X, Wang Q, Lin Y, Gan L, 'Confirmation and Determination of Sugars in Soft Drink Products by IEC with ESI-MS', CHROMATOGRAPHIA, 69 761-764 (2009)
DOI 10.1365/s10337-009-0969-3
Citations Scopus - 7Web of Science - 7
2009 Zhang X, Lin Y-M, Chen Z-L, '2,4,6-Trinitrotoluene reduction kinetics in aqueous solution using nanoscale zero-valent iron', JOURNAL OF HAZARDOUS MATERIALS, 165 923-927 (2009)
DOI 10.1016/j.jhazmat.2008.10.075
Citations Scopus - 66Web of Science - 58
2009 Jiang M-Q, Wang Q-P, Jin X-Y, Chen Z-L, 'Removal of Pb(II) from aqueous solution using modified and unmodified kaolinite clay', JOURNAL OF HAZARDOUS MATERIALS, 170 332-339 (2009)
DOI 10.1016/j.jhazmat.2009.04.092
Citations Scopus - 119Web of Science - 96
2008 Chen ZL, Owens G, 'Trends in speciation analysis of vanadium in environmental samples and biological fluids-A review', Analytica Chimica Acta, 607 1-14 (2008)

A comprehensive review is presented addressing recent trends in the speciation and determination of vanadium in environmental and biological sample matrices, including important a... [more]

A comprehensive review is presented addressing recent trends in the speciation and determination of vanadium in environmental and biological sample matrices, including important analytical aspects such as sample clean up, pre-concentration and method development. Methodology based on both separation and spectroscopic techniques for the determination of vanadium speciation is discussed. A brief outline of analytical principles, together with an overview of the recent developments and applications of vanadium speciation determination is included. The newer methods for detecting metal ions including hyphenated spectroscopic techniques and sample preparation schemes are also discussed. © 2007 Elsevier B.V. All rights reserved.

DOI 10.1016/j.aca.2007.11.013
Citations Scopus - 52
2008 Chen Z, Sun Q, Xi Y, Owens G, 'Speciation ofmetal-EDTA complexesby flow injection analysis with electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry', Journal of Separation Science, 31 3796-3802 (2008)

Flow injection analysis (FIA) with ESI-MS and ion chromatography (IC) with inductively coupled plasma-MS (ICP-MS) as the complementary technique have been explored for the determi... [more]

Flow injection analysis (FIA) with ESI-MS and ion chromatography (IC) with inductively coupled plasma-MS (ICP-MS) as the complementary technique have been explored for the determination of metal ions as their metal-EDTA complexes. ESI-MS enabled the identification of metal-EDTA complexes such as [Mn(EDTA)] 2- , [Co(EDTA)] 2- , [Ni(EDTA)] 2- , [Cu(EDTA)] 2- , [Zn(EDTA)] 2- , [Pb(EDTA)] 2- , and [Fe(EDTA)] 1- and their MS spectral showed that these metal-EDTA complexes were present in solution. Based on the ESI-MS, ion chromatographic separation and ICP-MS detection of these complexes are possible because IC-ICP-MS requires stable metal-EDTA complex during the chromatographic separation. The separation of these metal-EDTA complexes was achieved on an anion-exchange column with a mobile phase containing 30 mM NH 4 (HPO 4 ) 2 at pH 7.5 within 7 min with ICP-MS providing element specific detection. The ICP-MS LODs for the metal-EDTA were in the range of 0.1-0.5 µg/L with the exception of Fe (15 µg/L). The proposed method was a simple procedure for sample processing, using direct injection of sample without removal of sample matrix and was successfully applied to the determination of metal-EDTA complexes in real samples. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

DOI 10.1002/jssc.200800292
Citations Scopus - 23
2008 Jin XY, Jiang MQ, Shan XQ, Pei ZG, Chen Z, 'Adsorption of methylene blue and orange II on unmodified and surfactant modified zeolite', Journal of Colloid and Interface Science, 318 243-247 (2008)
Citations Scopus - 107
2008 Chen Z, Kim K-R, Owens G, Naidu R, 'Determination of carboxylic acids from plant root exudates by ion exclusion chromatography with ESI-MS', CHROMATOGRAPHIA, 67 113-117 (2008)
DOI 10.1365/s10337-007-0457-6
Citations Scopus - 15Web of Science - 12
Co-authors Ravi Naidu
2008 Chen Z, Akter KF, Rahman MM, Naidu R, 'The separation of arsenic species in soils and plant tissues by anion-exchange chromatography with inductively coupled mass spectrometry using various mobile phases', MICROCHEMICAL JOURNAL, 89 20-28 (2008)
DOI 10.1016/j.microc.2007.10.007
Citations Scopus - 26Web of Science - 26
Co-authors Mahmud Rahman, Ravi Naidu
2008 Chen Z, Wang W, Mallavarapu M, Naidu R, 'Comparison of no gas and He/H-2 cell modes used for reduction of isobaric interferences in selenium speciation by ion chromatography with inductively coupled plasma mass spectrometry', SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 63 69-75 (2008)
DOI 10.1016/j.sab.2007.11.019
Citations Scopus - 7Web of Science - 7
Co-authors Ravi Naidu, Megh Mallavarapu
2007 Chen Z, Owens G, Naidu R, 'Confirmation of vanadium complex formation using electrospray mass spectrometry and determination of vanadium speciation by sample stacking capillary electrophoresis', ANALYTICA CHIMICA ACTA, 585 32-37 (2007)
DOI 10.1016/j.aca.2006.12.008
Citations Scopus - 19Web of Science - 17
2007 Chen Z, Owens G, Kim K-R, Naidu R, 'Confirmation of lead aminocarboxylic complex formation using electrospray ionization mass spectrometry and speciation by anion-exchange chromatography coupled with ICP-MS', ANALYTICA CHIMICA ACTA, 599 163-169 (2007)
DOI 10.1016/j.aca.2007.08.012
Citations Scopus - 15Web of Science - 14
Co-authors Ravi Naidu
2007 Chen ZL, Megharaj M, Naidu R, 'Determination of bromate and bromide in seawater by ion chromatography, with an ammonium salt solution as mobile phase, and inductively coupled plasma mass spectrometry', CHROMATOGRAPHIA, 65 115-118 (2007)
DOI 10.1365/s10337-006-0128-z
Citations Scopus - 25Web of Science - 22
Co-authors Megh Mallavarapu, Ravi Naidu
2007 Chen Z, Khan NI, Owens G, Naidu R, 'Elimination of chloride interference on arsenic speciation in ion chromatography inductively coupled mass spectrometry using an octopole collision/reaction system', MICROCHEMICAL JOURNAL, 87 87-90 (2007)
DOI 10.1016/j.microc.2007.05.011
Citations Scopus - 17Web of Science - 18
Co-authors Ravi Naidu
2007 Chen Z, Megharaj M, Naidu R, 'Speciation of chromium in waste water using ion chromatography inductively coupled plasma mass spectrometry', TALANTA, 72 394-400 (2007)
DOI 10.1016/j.talanta.2006.10.041
Citations Scopus - 50Web of Science - 49
Co-authors Ravi Naidu, Megh Mallavarapu
2007 Chen Z, Megharaj M, Naidu R, 'Speciation of iodate and iodide in seawater by non-suppressed ion chromatography with inductively coupled plasma mass spectrometry', TALANTA, 72 1842-1846 (2007)
DOI 10.1016/j.talanta.2007.02.014
Citations Scopus - 42Web of Science - 43
Co-authors Ravi Naidu, Megh Mallavarapu
2007 Chen Z, Megharaj M, Naidu R, 'Removal of interferences in the speciation of chromium using an octopole reaction system in ion chromatography with inductively coupled plasma mass spectrometry', TALANTA, 73 948-952 (2007)
DOI 10.1016/j.talanta.2007.05.030
Citations Scopus - 23Web of Science - 24
Co-authors Megh Mallavarapu, Ravi Naidu
2007 Chen Z, Rahman MM, Naidu R, 'Speciation of vanadium by anion-exchange chromatography with inductively coupled plasma mass spectrometry and con. rmation of vanadium complex formation using electrospray mass spectrometry', JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 22 811-816 (2007)
DOI 10.1039/b705481e
Citations Scopus - 13Web of Science - 13
Co-authors Ravi Naidu, Mahmud Rahman
2007 Chen Z, Megharaj M, Naidu R, 'Confirmation of iron complex formation using electrospray ionization mass spectrometry (ESI-MS) and sample stacking for analysis of iron polycarboxylate speciation by capillary electrophoresis', MICROCHEMICAL JOURNAL, 86 94-101 (2007)
DOI 10.1016/j.microc.2006.12.001
Citations Scopus - 15Web of Science - 14
Co-authors Megh Mallavarapu
2007 Chen Z, Jin X, Wang Q, Lin Y, Gan L, Tang C, 'Confirmation and determination of carboxylic acids in root exudates using LC-ESI-MS', JOURNAL OF SEPARATION SCIENCE, 30 2440-2446 (2007)
DOI 10.1002/jssc.200700234
Citations Scopus - 10Web of Science - 10
2006 Xu JM, Tang C, Chen ZL, 'Chemical composition controls residue decomposition in soils differing in initial pH', Soil Biology and Biochemistry, 38 544-552 (2006)

Laboratory incubation studies were conducted to determine the dynamics of low-molecular-weight aliphatic carboxylic acids and their anions (LACAs) and respiration in three soils i... [more]

Laboratory incubation studies were conducted to determine the dynamics of low-molecular-weight aliphatic carboxylic acids and their anions (LACAs) and respiration in three soils incorporated with five types of plant residues differing in chemical composition. Concentrations of total and individual LACAs in soils decreased sharply with initial 3 days after addition of plant residues, and varied with types of plant residue and soil. Irrespective of soil types, the amount of total extractable LACAs was highest in the soils treated with chickpea, followed by lucerne and high-N wheat straw, and lowest with low-N wheat straw. Lancelin soil [initial pH(CaCl 2 ) 5.06] contained higher concentration of extractable LACAs compared with Bodallin (pH 4.54) and Wodjil soil (pH 3.87). Soil respiration rate was rapidly increased by the addition of plant residues, and reached the peak by Day 3. Respiration rate was the greatest in Lancelin soil and the smallest in Wodjil soil. The amounts of CO 2 respired over 7 days were equivalent to 6-25% of the added C for Wodjil soil, 6-39% for Bodallin soil and 6-47% for Lancelin soil, depending on type of plant residue. Those amounts over 105 days increased further. Irrespective of plant residue and soil type, the cumulative respiration correlated positively with concentrations of N, excess cations and soluble C in plant residues and initial soil pH, and negatively with C:N of plant residues. The results suggest that chemical composition of plant residues plays an important role at the initial stage of residue decomposition. © 2005 Elsevier Ltd. All rights reserved.

DOI 10.1016/j.soilbio.2005.06.006
Citations Scopus - 43
2006 Xu JM, Tang C, Chen ZL, 'The role of plant residues in pH change of acid soils differing in initial pH', Soil Biology and Biochemistry, 38 709-719 (2006)

Reports on the effect of plant residues on soil pH have been contradictory. The conflicting accounts have been suggested to result from differences in compositions and types of pl... [more]

Reports on the effect of plant residues on soil pH have been contradictory. The conflicting accounts have been suggested to result from differences in compositions and types of plant residues and characteristics of soils. This incubation study examined the effect of plant residues differing in concentrations of N (3-49 g kg -1 ) and of alkalinity (excess cations) (220-1560 mmol kg -1 ) on pH change of three soils differing in initial pH (3.9-5.1 in 0.01 M CaCl 2 ). The addition of plant residues at a rate of 15 g kg -1 soil weight increased the pH of all soils by up to 3.4 units and the pH reached the maximum at day 42 after incubation for Wodjil (initial pH 3.87) and Bodallin (pH 4.54) soils and day 14 for Lancelin soil (pH 5.1). The amount of pH buffering was decreased by residue addition in Wodjil soil, increased in Bodallin soil and remained unchanged in Lancelin soil, which closely related to changes of soil pH. Residue addition increased NH4+ concentration and the increase in NH4+ concentration generally correlated positively with the concentration of residue N. The NH4+ concentration increased with time, reached the peak at Days 42-105 for Wodjil soil, Days 14-105 for Bodallin soil and Days 14-42 for Lancelin soil, and then decreased only in Lancelin soil. The concentration of NO3- was kept minimal in Wodjil and Bodallin soils. In Lancelin soil, NO3- concentrations increased with incubation time from days 14-28. Irrespective of plant residue and incubation time, the amounts of alkalinity produced due to residue addition correlated highly with the sum of the alkalinity added as plant residues (excess cations) and those resulting from mineralization of residue N, with the slope of regression lines decreasing with increase of the initial soil pH. Direct shaking of soil with the residues at the same rate of alkalinity (excess cations) under sterile conditions increased the pH of the Wodjil soil but decreased it in the Lancelin soil. It is suggested that the decarboxylation of organic anions (as indicated by excess cations) of added plant residues and ammonification of the residue N causes soil pH increase whereas nitrification of mineralised residue nitrogen causes soil pH decrease, and that the association/dissociation of organic compounds also plays a role in soil pH change, depending initial pH of the soil. The overall effect on soil pH after addition of plant residues would therefore depend on the extent of each of these processes under given conditions. © 2005 Elsevier Ltd. All rights reserved.

DOI 10.1016/j.soilbio.2005.06.022
Citations Scopus - 117
2006 Sun Y, Xie ZM, Li J, Xu JM, Chen ZL, Naidu R, 'Assessment of toxicity of heavy metal contaminated soils by the toxicity characteristic leaching procedure', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 28 73-78 (2006)
DOI 10.1007/s10653-005-9014-0
Citations Scopus - 36Web of Science - 26
Co-authors Ravi Naidu
2006 Chen Z, Akter KF, Mahmudur M, Rahman, Naidu R, 'Speciation of arsenic by ion chromatography inductively coupled plasma mass spectrometry using ammonium eluents', JOURNAL OF SEPARATION SCIENCE, 29 2671-2676 (2006)
DOI 10.1002/jssc.200500304
Citations Scopus - 18Web of Science - 14
Co-authors Ravi Naidu, Mahmud Rahman
2005 Akter KF, Chen Z, Smith L, Davey D, Naidu R, 'Speciation of arsenic in ground water samples: A comparative study of CE-UV HG-AAS and LC-ICP-MS', TALANTA, 68 406-415 (2005)
DOI 10.1016/j.talanta.2005.09.011
Citations Scopus - 49Web of Science - 42
Co-authors Ravi Naidu
2004 Qu F, Lin JM, Chen Z, 'Simultaneous separation of nine metal ions and ammonium with nonaqueous capillary electrophoresis', Journal of Chromatography A, 1022 217-221 (2004)

A simple and fast method for simultaneous separation of nine metal cations Ni 2+ , Cu 2+ , Co 2+ , Zn 2+ Cd 2+ , K + , Na + , Mg 2+ and Ca 2+ , and NH 4 + in methanol is repo... [more]

A simple and fast method for simultaneous separation of nine metal cations Ni 2+ , Cu 2+ , Co 2+ , Zn 2+ Cd 2+ , K + , Na + , Mg 2+ and Ca 2+ , and NH 4 + in methanol is reported. The optimization for separation these 10 cations was achieved by using 0.5% acetic acid and 10mM imidazole as electrolyte. The effects of water and ionic strength in the sample are discussed. The sensitive detection of transition metal ions was accomplished at 191nm. The optimized method demonstrated high efficiency and good reproducibility, and was applied successfully to the qualitative and quantitative determination of transition metal ions in water samples, chemical reagents, oral zinc gluconate solution and human plasma. © 2003 Elsevier B.V. All rights reserved.

DOI 10.1016/j.chroma.2003.09.039
Citations Scopus - 29
2004 Wang M, Lin JM, Qu F, Shan X, Chen Z, 'On-capillary complexation of metal ions with 4-(2-thiazolylazo)resorcinol in capillary electrophoresis', Journal of Chromatography A, 1029 249-254 (2004)

Co(II), Zn(II), Ni(II) and Fe(II) were successfully separated by capillary electrophoresis using pre-capillary and on-capillary complexation with 4-(2-thiazolylazo)resorcinol. The... [more]

Co(II), Zn(II), Ni(II) and Fe(II) were successfully separated by capillary electrophoresis using pre-capillary and on-capillary complexation with 4-(2-thiazolylazo)resorcinol. The influences of some crucial parameters, including both pre- and on-capillary complexation procedure, were investigated. For on-capillary complexation, the complexing reaction was carried out inside the capillary by mixing the zones of ligand and sample during the electrophoretic migration. Compared with pre-capillary complexation, the method provided 30-fold reduction in detection limits for Co(II), 50-fold reduction for Zn(II), and 100-fold reduction for Ni(II) and Fe(II). It was used for the analysis of a pharmaceutical and tap water sample. © 2004 Elsevier B.V. All rights reserved.

DOI 10.1016/j.chroma.2003.12.011
Citations Scopus - 26
2004 Sethunathan N, Megharaj M, Chen ZL, Williams BD, Lewis G, Naidu R, 'Algal degradation of a known endocrine disrupting insecticide, alpha-endosulfan, and its metabolite, endosulfan sulfate, in liquid medium and soil', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 52 3030-3035 (2004)
DOI 10.1021/jf035173x
Citations Scopus - 42Web of Science - 43
Co-authors Ravi Naidu, Megh Mallavarapu
2004 Chen ZL, Naidu R, 'On-column complexation capillary electrophoretic separation of Fe2+ and Fe3+ using 2,6-pyridinedicarboxylic acid coupled with large-volume sample stacking', JOURNAL OF CHROMATOGRAPHY A, 1023 151-157 (2004)
DOI 10.1016/j.chroma.2003.10.002
Citations Scopus - 35Web of Science - 32
Co-authors Ravi Naidu
2004 Chen ZL, Megharaj M, Naidu R, 'Determination of tetrachloroethene, trichloroethylene, and their metabolites at trace levels in ground waters by on-line solid phase extraction/HPLC', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 27 885-896 (2004)
DOI 10.1081/JLC-120029705
Citations Scopus - 1Web of Science - 1
Co-authors Megh Mallavarapu, Ravi Naidu
2003 Singh N, Megharaj M, Gates WP, Churchman GJ, Anderson J, Kookana RS, et al., 'Bioavailability of an organophosphorus pesticide, fenamiphos, sorbed on an organo clay', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 51 2653-2658 (2003)
DOI 10.1021/jf025978p
Citations Scopus - 40Web of Science - 38
Co-authors Megh Mallavarapu, Ravi Naidu
2003 Chen ZL, Naidu R, 'Separation of sulfur species in water by co-electroosmotic capillary electrophoresis with direct and indirect UV detection', INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, 83 749-759 (2003)
DOI 10.1080/030731031000114938
Citations Scopus - 6Web of Science - 7
Co-authors Ravi Naidu
2003 Kanitsar K, Chen ZL, Owens G, Naidu R, 'Influence of organic modifiers on the separation of carboxylic acids using Co-EOF capillary electrophoresis', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 26 455-468 (2003)
DOI 10.1081/JLC-120017182
Co-authors Ravi Naidu
2003 Chen ZL, Owens G, Naidu R, 'Enhanced selectivity and sensitivity for inorganic anions using an ion-pairing reagent and sample stacking in capillary zone electrophoresis with direct UV detection', ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 375 182-187 (2003)
DOI 10.1007/s00216-002-1621-3
Citations Scopus - 8Web of Science - 7
Co-authors Ravi Naidu
2003 Chen ZL, Lin JM, Naidu R, 'Separation of arsenic species by capillary electrophoresis with sample-stacking techniques', ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 375 679-684 (2003)
DOI 10.1007/s00216-003-1777-5
Citations Scopus - 22Web of Science - 20
Co-authors Ravi Naidu
2003 Yu JC, Chan SM, Chen Z, 'Preconcentration using diethylenetriaminetetraacetic acid-functionalized polysiloxane (DETAP) for determination of molybdenum(VI) in seawater by ICP-OES', Analytical and Bioanalytical Chemistry, 376 728-734 (2003)

This paper reports a new method for preconcentration and separation of trace amounts of molybdenum in seawater samples prior to determination by inductively coupled plasma-atomic ... [more]

This paper reports a new method for preconcentration and separation of trace amounts of molybdenum in seawater samples prior to determination by inductively coupled plasma-atomic emission spectroscopy (ICP-OES). Diethylenetriaminetetraacetic acid-functionalized polysiloxane (DETAP) was synthesized by carboxymethylation of amino groups on triamine immobilized polymer, which was prepared by modification of 3-chloropropylpolysiloxane with diethylenetriamine. The resulting polysiloxane is highly selective and efficient in chelating Mo(VI) at trace levels. It can be used as a column packing material. The polysiloxane column can be reused over ten times without losing its original properties, so it is suitable for preconcentration of molybdenum species in seawater samples before determination. The parameters governing the characteristics of polysiloxane for adsorption of Mo(VI) were investigated. These include the effect of pH, amount of polysiloxane, equilibrium time, adsorption isotherm, maximum adsorption capacity, interfering ions, flow rate, capacity for reuse, and desorption. The precision of the preconcentration method, calculated as the relative standard deviation of seawater samples, was 3%. The preconcentration factor was 100. The detection limit, defined as 3 times the standard deviation of five replicate measurements of the blank sample at pH 3, was 0.17 µg L -1 . Measurement results for standard reference materials were in good agreement with the certified values [(CRMs), NASS-2 Seawater (Open Ocean) and CASS-2 Seawater (Coastal)]. © Springer-Verlag 2003.

DOI 10.1007/s00216-003-1956-4
Citations Scopus - 14
2002 Xu J, Chen Z, Yu JC, Tang C, 'Simultaneous determination of inorganic anions, carboxylic and aromatic carboxylic acids by capillary zone electrophoresis with direct UV detection', Journal of Chromatography A, 942 289-294 (2002)

Co-electroosmotic capillary zone electrophoresis (CZE) with direct UV detection was developed for simultaneous determination of inorganic anions, carboxylic and aromatic carboxyli... [more]

Co-electroosmotic capillary zone electrophoresis (CZE) with direct UV detection was developed for simultaneous determination of inorganic anions, carboxylic and aromatic carboxylic acids. These solutes were separated using a 30 mM phosphate buffer containing 1.0 mM tetradecyltrimethylammonium bromide (TTAB) and 20% (v/v) acetonitrile at pH of 6.5 and directly detected by UV at 190 nm. Calibration curves were linear in the range 0.01-2.0 mM, depending of the solutes. The detection limits ranged from 1.0 to 8.0 µM and the relative standards deviations (n=5) in range from 1.9 to 3.6% for the peak area. The proposed method was used to determine inorganic anions and carboxylic and aromatic acids in soil and plant tissue extracts. © 2002 Elsevier Science B.V. All rights reserved.

DOI 10.1016/S0021-9673(01)01402-9
Citations Scopus - 25
2002 Chen ZL, Pavelic P, Dillon P, Naidu R, 'Determination of caffeine as a tracer of sewage effluent in natural waters by on-line solid-phase extraction and liquid chromatography with diode-array detection', WATER RESEARCH, 36 4830-4838 (2002)
DOI 10.1016/S0043-1354(02)00221-X
Citations Scopus - 43Web of Science - 40
2002 Ying GG, Kookana RS, Chen Z, 'On-line solid-phase extraction and fluorescence detection of selected endocrine disrupting chemicals in water by high-performance liquid chromatography', Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes, 37 225-234 (2002)

A high-performance liquid chromatographic method was developed to analyse selected endocrine disrupting chemicals in water by using automated on-line solid-phase extraction with a... [more]

A high-performance liquid chromatographic method was developed to analyse selected endocrine disrupting chemicals in water by using automated on-line solid-phase extraction with a fluorescence detector. The excitation and emission wavelengths of the fluorescence detector were 230 nm and 290 nm, respectively. The selected endocrine disrupting chemicals include hormone steroids such as estradiol (E2), estriol (E3), ethynylestradiol (EE2), and ethynylestradiol 3-methyl ether (MeEE2) as well as nonylphenols (NP), octylphenols (OP), POE(1-2) nonyl phenol (NPE) and bisphenol A (BP). Three types of on-line cartridges (C18, PLRP-s and PRP-1) were tested to pre-concentrate the endocrine disruptors in deionised water. It was found that the recoveries of these chemicals at 1 µg/L were close to 100% except for 4-octyl phenol and 4-n-nonyl phenol, which had recoveries of about 40% to 80%. The two polymer cartridges (PLRP-s and PRP-1) gave higher recoveries than the C18 cartridges. The addition of methanol at 5% to 10% in water significantly improved the recovery of 4-octyl phenol and 4-n-nonyl phenol. The addition of methanol also led to an improvement in the recovery with C18 cartridges. With the addition of methanol in water samples, these three types of cartridges gave similar recoveries for the chemicals. The detection limits of this method ranged from 20 ng/L to 50 ng/L. A river water sample spiked with these chemicals was analysed using the above method and we found no interference with the peaks of the selected endocrine disrupting chemicals. The recoveries for these chemicals were more than 92% except for 4-NP with a recovery of 61%. This relatively simple method is useful for laboratory studies on the environmental fate of these endocrine disrupting chemicals in water.

DOI 10.1081/PFC-120003100
Citations Scopus - 25
2002 Sethunathan N, Megharaj M, Chen Z, Singh N, Kookana RS, Naidu R, 'Persistence of endosulfan and endosulfan sulfate in soil as affected by moisture regime and organic matter addition', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 68 725-731 (2002)
DOI 10.1007/s00128-001-0314-5
Citations Scopus - 36Web of Science - 34
Co-authors Ravi Naidu, Megh Mallavarapu
2002 Chen ZL, Megharaj M, Naidu R, 'Comparison of adsorbents for on-line solid-phase extraction of polycyclic aromatic hydrocarbons before liquid chromatography with UV detection', CHROMATOGRAPHIA, 56 105-108 (2002)
DOI 10.1007/BF02490254
Citations Scopus - 4Web of Science - 4
Co-authors Ravi Naidu, Megh Mallavarapu
2002 Chen ZL, Naidu R, 'On-column complexation of metal ions using 2,6-pyridinedicarboxylic acid and separation of their anionic complexes by capillary electrophoresis with direct UV detection', JOURNAL OF CHROMATOGRAPHY A, 966 245-251 (2002)
DOI 10.1016/S0021-9673(02)00741-0
Citations Scopus - 26Web of Science - 20
Co-authors Ravi Naidu
2002 Chen ZL, Megharaj M, Naidu R, 'On-line solid phase extraction of pesticide residues in natural water, coupled with liquid chromatography and UV detection, using various sorbents', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 25 1779-1790 (2002)
DOI 10.1081/JLC-120005873
Citations Scopus - 2Web of Science - 1
Co-authors Megh Mallavarapu, Ravi Naidu
2002 Chen ZL, Naidu R, 'On-column complexation and simultaneous separation of vanadium(IV) and vanadium(V) by capillary electrophoresis with direct UV detection', ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 374 520-525 (2002)
DOI 10.1007/s00216-002-1456-y
Citations Scopus - 28Web of Science - 27
Co-authors Ravi Naidu
2001 Chen Z, Yu JC, Wu XJ, 'Separation and determination of Cr(III) by titanium dioxide-filled column and inductively coupled plasma mass spectrometry', Analytica Chimica Acta, 436 59-67 (2001)
Citations Scopus - 33
2001 Chen Z, Megharaj M, Naidu R, '.On-line solid phase extraction of pesticide residues in natural water, coupled with liquid chromatography and UV detection, using various sorbents', Journal of Liquid Chromatography &Related Technologies, 25 1779-1790 (2001)
2001 Yu JC, Qu F, Chen Z, 'Ion chromatographic separation of anions and cations on a titania packed column', Journal of Liquid Chromatography &Related Technologies, 24 367-380 (2001)
Citations Scopus - 11
2001 Chen ZL, Krishnamurti GSR, Naidu R, 'Separation of phenolic acids in soil and plant tissue extracts by co-electroosmotic capillary electrophoresis with direct UV detection', CHROMATOGRAPHIA, 53 179-184 (2001)
Citations Scopus - 15Web of Science - 16
Co-authors Ravi Naidu
2001 Naidu R, Chen ZL, 'Application of co-electroosmotic capillary electrophoresis for the determination of inorganic anions and carboxylic acids in soil and plant extract with direct UV detection', CHROMATOGRAPHIA, 54 495-500 (2001)
DOI 10.1007/BF02491206
Citations Scopus - 14Web of Science - 14
Co-authors Ravi Naidu
2001 Chen ZL, Naidu R, Subramanian A, 'Separation of chromium (III) and chromium (VI) by capillary electrophoresis using 2,6-pyridinedicarboxylic acid as a pre-column complexation agent', JOURNAL OF CHROMATOGRAPHY A, 927 219-227 (2001)
DOI 10.1016/S0021-9673(01)01116-5
Citations Scopus - 50Web of Science - 46
Co-authors Ravi Naidu
2000 Xu J, Chen Z, Yu JC, Tang C, 'Separation and detection of metal ions in ecological samples by capillary zone electrophoresis with indirect UV detection', HRC Journal of High Resolution Chromatography, 23 511-514 (2000)
Citations Scopus - 10
2000 Chen Z, Zhu Y, 'Capillary gel electrophoretic separation of superoxide dismutases in leaf extracts of Triticum aestivum L.', Phytochemical Analysis, 11 362-365 (2000)

Capillary gel electrophoretic (CGE) separation of metal superoxide dismutase (SOD; EC 1.15.1.1) types is described. A mixture of standard SOD types was fully denatured into SDS-SO... [more]

Capillary gel electrophoretic (CGE) separation of metal superoxide dismutase (SOD; EC 1.15.1.1) types is described. A mixture of standard SOD types was fully denatured into SDS-SOD complexes in the presence of excess sodium dodecylsulphate (SDS). The SDS-SOD complexes were separated using an uncoated fused silica capillary filled with a polymer running buffer and detected spectrophotometrically at 200 nm. Three types of SOD were separated, namely, Cu/ZnSOD (32 kDa), FeSOD (38 kDa) and MnSOD (40 kDa). Calibration curves were linear in the concentration range of 0.1-5.0 mg/mL with a detection limit in the order of 0.05 mg/mL. The reproducibility of the migration time was high with a relative standard deviation of less than 1.50%. The proposed method was demonstrated to be applicable to the separation of SOD types in leaf extracts of wheat. Copyright © 2000 John Wiley & Sons, Ltd.

DOI 10.1002/1099-1565(200011/12)11:6&amp;lt;362::AID-PCA542&amp;gt;3.0.CO;2-U
Citations Scopus - 3
2000 Xu J, Chen Z, Yu JC, Tang C, 'Separation and detection of metal ions in ecological samples by capillary zone electrophoresis with indirect UV detection', Journal of Separation Science, 23 511-514 (2000)
Citations Scopus - 1
2000 Chen ZL, Warren CR, Adams MA, 'Separation of rubisco in extracts of plant leaves by capillary electrophoresis with sieving polymers', Analytical Letters, 33 579-587 (2000)

Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase; EC 4.1.1.39) was separated in extracts of plant leaves by capillary electrophoresis with replaceable polymers. Rubisco ex... [more]

Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase; EC 4.1.1.39) was separated in extracts of plant leaves by capillary electrophoresis with replaceable polymers. Rubisco extracted from plant leaves was fully denatured into small (15.8 kDa) and large (52.9 kDa) subunits in the presence of excess sodium dodecylsulfate (SDS). SDS-Rubisco complexes were separated by using an uncoated fused silica capillary filled with a replaceable polymer solution, with detection at 220 nm. A calibration plot of Rubisco concentration in plant extract versus peak area was linear over the concentration range of 0.09-1.2 mg mL -1 with a correlation coefficient (r 2 ) of 0.995 and a detection limit of 0.05 mg mL -1 . The reproducibility of migration times was less than 0.27% RSD (n=5) and reproducibility of peak area was better than 6.9%. The recovery of Rubisco in leaf tissues through the extraction and analysis procedure was 78.2% (±4.8) and through the analysis procedure alone was 96.9% (±5.1). The proposed method was used for the quantification of Rubisco in protein extracts from leaves of a variety of plant species.

Citations Scopus - 4
2000 Warren CR, Chen ZL, Adams MA, 'Effect of N source on concentration of Rubisco in Eucalyptus diversicolor, as measured by capillary electrophoresis', Physiologia Plantarum, 110 52-58 (2000)

Proteins in plant tissues have been extensively characterised by conventional methods such as liquid chromatography and polyacrylamide gel electrophoresis - methods that are tedio... [more]

Proteins in plant tissues have been extensively characterised by conventional methods such as liquid chromatography and polyacrylamide gel electrophoresis - methods that are tedious and time-consuming. Capillary electrophoresis is potentially a more simple and cost-effective method (with respect to time and consumables) but needs substantial development, especially for native plants which are frequently poor in protein and rich in interfering substances (oils, tannins, phenols). We report here the development of capillary electrophoresis (CE) for the separation of SDS-protein complexes (by molecular mass) and their quantification in plant tissues. In leaf extracts, two peaks dominated the electropherograms, these peaks had migration times corresponding to the small and large subunits of Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase; EC 4.1.1.39) and co-migrated with added purified Rubisco. Linearity of peak area, reproducibility of migration time and peak areas for the small and large subunit were excellent, suggesting Rubisco could be quantified with a high degree of accuracy. We determined how the concentration (0.5 or 4 mM) and form of N applied (nitrate versus ammonium) affects partitioning of N to Rubisco in seedlings of Eucalyptus diversicolor. Analysis of extracts from leaves of E. diversicolor was only possible after precipitation of proteins with trichloroacetic acid (TCA). Precipitation with TCA was highly reproducible and recovery of added Rubisco through procedures of extraction, precipitation and analysis were close to 100% for both subunits. An 8-fold difference in the concentration of N applied did not affect total N, the concentration of Rubisco or the fraction of N present as Rubisco. The similarity of total N may well reflect faster rates of growth in those plants receiving 4 mM N, and a subsequent 'dilution' of tissue N. The N source did not affect total N, the concentration of Rubisco or the fraction of N present as Rubisco. Despite similar Rubisco concentrations, the total concentration of soluble proteins was greater in ammonium-grown plants.

DOI 10.1034/j.1399-3054.2000.110107.x
Citations Scopus - 19
2000 Chen Z, LU XQ, Hall SB, Yang XH, 'Evaluation and characteristics of a Pb(II) ion-selective electrode based on aquatic humic substances .', Analytica Chimica Acta, 418 205-212 (2000)
Citations Scopus - 24
2000 Chen Z, Warren CR, Adams MA, 'Is photosynthesis related to concentrations of nitrogen and Rubisco in leaves of Australian native plants?', Australian Journal of Plant Physiology, 27 407-416 (2000)
Citations Scopus - 77
2000 Chen Z, Warren CR, Adams MA, 'Separation of amino acids in plant tissue extracts by capillary zone electrophoresis with indirect UV detection using aromatic carboxylates as background electrolyte.', Chromatographia, 51 180-186 (2000)
Citations Scopus - 20
2000 Chen ZL, Kookana RS, Naidu R, 'Determination of sulfonylurea herbicides in soil extracts by solid-phase extraction and capillary zone electrophoresis', CHROMATOGRAPHIA, 52 142-146 (2000)
DOI 10.1007/BF02490444
Citations Scopus - 26Web of Science - 25
Co-authors Ravi Naidu
1999 Yu Q, Tang C, Chen Z, Kuo J, 'Extraction of apoplastic sap from plant roots by centrifugation', New Phytologist, 143 299-304 (1999)

A centrifugal method for extracting apoplastic sap from roots of lupin (Lupinus angustifolius) and pea (Pisum sativum) plants, and a method to analyse malic dehydrogenase in the s... [more]

A centrifugal method for extracting apoplastic sap from roots of lupin (Lupinus angustifolius) and pea (Pisum sativum) plants, and a method to analyse malic dehydrogenase in the sap using capillary electrophoresis, are described. Osmolality of apoplastic sap was relatively constant at relative centrifugal forces (RCFs) between 600 and 3000 g for lupin, and between 600 and 4000 g for pea. Electropherograms of a marker enzyme (malic dehydrogenase) and other components in apoplastic and symplastic saps revealed that contamination occurred at 7000 g. It is suggested that apoplastic sap expelled from plant roots at RCF between 600 and 3000 g is free from symplastic contamination, and is regarded as being of apoplastic origin. The proposed method was used to measure apoplastic pH changes in the plant roots in response to external pH, ammonium, nitrate and vanadate.

DOI 10.1046/j.1469-8137.1999.00454.x
Citations Scopus - 35
1999 Chen Z, Yu JC, 'Potentiometric detection of ascorbate using a graphite carbon electrode', Talanta, 49 661-665 (1999)

A graphite carbon electrode was used for the potentiometric detection of ascorbate. The electrode exhibits a linear response with a slope of -42 ± 1.0 mV decade -1 in concentrat... [more]

A graphite carbon electrode was used for the potentiometric detection of ascorbate. The electrode exhibits a linear response with a slope of -42 ± 1.0 mV decade -1 in concentrations ranging from 5 x 10 -4 to 5.0 x 10 -2 M in 0.1 M NaOH solution with a detection limit of 5.0 x 10 -6 M. The response mechanism of this electrode was investigated by potentiometry, voltammetry, and scanning electron micoscropy (SEM), and it suggests that the electrode potential change resulted from the ion-exchange adsorption and subsequent oxidation of ascorbate on the electrode surface at pH 12-13. The electrode exhibits high sensitivity, selectivity and reproducibility.

DOI 10.1016/S0039-9140(99)00070-3
Citations Scopus - 7
1999 Lu X, Chen Z, Yang X, 'Spectroscopic study of aluminium speciation in removing humic substances by Al coagulation', Water Research, 33 3271-3280 (1999)

Removal of humic substances (HS) isolated from swamp water, surface soil, peat and brown coal by aluminium (Al) coagulation under different conditions was studied using the jar te... [more]

Removal of humic substances (HS) isolated from swamp water, surface soil, peat and brown coal by aluminium (Al) coagulation under different conditions was studied using the jar test method and spectroscopic techniques. At lower pHs < 4.5, humic substances formed soluble complexes with Al 3+ and the amounts of these HS-Al complexes increased with increasing concentration of the humic substances. Maximum removal of the humic substances was found to occur in the pH range from 5.0 to 7.0, due to the adsorption of humic substances on the surface of Al(OH)(3(s)) crystal. Sequential extraction of the humic substances adsorbed on Al(OH)(3(s)) using the Soxhlet technique with different solvents showed that the adsorption forces involved were great. The effects of humic substances on the Al speciation are discussed and a model is proposed to explain the mechanism for the removal of humic substances during the Al coagulation process. Copyright (C) 1999 Elsevier Science Ltd.

DOI 10.1016/S0043-1354(99)00047-0
Citations Scopus - 73
1999 Chen Z, Adams MA, 'Simultaneous determination of aliphatic and aromatic acids in plant tissue extracts by ion-exclusion chromatography', Analytica Chimica Acta, 386 249-256 (1999)
Citations Scopus - 25
1999 Chen Z, Adams MA, Landman P, Colmer TD, 'Simultaneous determination by capillary gas chromatography of organic acids, sugars, and sugar alcohols in plant tissue extracts as their trimethylsilyl derivatives', Analytical Biochemistry, 266 77-84 (1999)
Citations Scopus - 81
1999 Chen Z, Tang C, Xu JM, 'Non-suppressed conductivity and indirect UV detection of carboxylic acids in environmental samples by ion-exclusion chromatography using 2,6-pyridinedicarboxylic acidic eluent', Journal of Chromatography A, 859:173-181. 173-181 (1999)
Citations Scopus - 16
1999 Chen Z, Adams MA, 'Retention behaviour and simultaneous separation of carboxylic and aromatic acids using ion-exclusion chromatography', Journal of Liquid Chromatography &Related Technologies, 22 2595-2611 (1999)
1999 Chen ZL, Adams MA, '2,6-Pyridinedicarboxylic acid as an eluent for UV and conductivity detection of inorganic anions, magnesium and calcium in water by ion chromatography', Chromatographia, 49 496-502 (1999)

2,6-Pyridinedicarboxylic acid (2,6-PDC) was investigated as an eluent for ion chromatographic (IC) separation of inorganic anions, Mg 2+ and Ca 2+ followed by UV and conductivit... [more]

2,6-Pyridinedicarboxylic acid (2,6-PDC) was investigated as an eluent for ion chromatographic (IC) separation of inorganic anions, Mg 2+ and Ca 2+ followed by UV and conductivity detection. Other eluents containing trimesic, pyromellitic and commonly used gluconate/borate were also studied. Eluents containing 2, 6-PDC gave reasonable resolution and detection sensitivity for all analytes of interest. The effects of eluent pH and concentration of 2,6-PDC on the retention and sensitivity were investigated systematically. The separation and detection of HCO 3 - , H 2 PO 4 - , Cl - , NO 2 - , NO 3 - , SO 4 2- , Mg 2+ and Ca 2+ within 11 minutes were performed using 1 mM 2,6-PDC at pH 6.0. Detection limits were in the range 5-15 µM for UV detection and 1.5-4 µM for conductivity detection. The proposed method offers a quick, sensitive and simple means for the determination of common anions, Mg 2+ and Ca 2+ particularly in water samples.

DOI 10.1007/BF02467748
Citations Scopus - 16
1999 Chen ZL, Tang C, Yu JC, 'Simultaneous determination of inorganic anions and organic acids in environmental samples by capillary zone electrophoresis with indirect UV detection', HRC Journal of High Resolution Chromatography, 22 379-385 (1999)

Capillary zone electrophoresis (CZE) with indirect UV detection was developed for the simultaneous determination of inorganic anions and organic acids in environmental samples. Va... [more]

Capillary zone electrophoresis (CZE) with indirect UV detection was developed for the simultaneous determination of inorganic anions and organic acids in environmental samples. Various aromatic acids (benzoic, phthalic, trimellitic, and pyromellitic acids) were evaluated as background electrolytes (BGEs) to give high resolution and detection sensitivity. Co- electroosmotic conditions such as the concentration of BGE, electrolyte pH, and EOF modifier were systematically investigated. Three inorganic anions and ten organic acids were determined simultaneously in 10 min using an electrolyte containing 10 mM phthalic acid, 0.5 mM myristyltrimethylammonium bromide (MTAB), and 5% methanol (MeOH) (v/v) at pH 5.60. Linear plots for the test solutes were obtained in the concentration range 0.011.0 mM with detection limits in the range 5-30 µM. The proposed method was successfully demonstrated for the determination of inorganic anions and organic acids in natural water, soil, and plant extracts after direct sample injection.

DOI 10.1002/(SICI)1521-4168(19990701)22:7&amp;lt;379::AID-JHRC379&amp;gt;3.0.CO;2-G
Citations Scopus - 27
1999 Chen Z, Pourabedi Z, Hibbert DB, 'Stripping voltammetry of Pb(II), Cu(II), and Hg(II) at a nafion-coated glassy carbon electrode modified by neutral ionophores', Electroanalysis, 11 964-968 (1999)

The analysis of Pb 2+ , Cu 2+ and Hg 2+ by stripping voltammetry using a Nafion-coated glassy carbon electrode modified with diethyl-dithiocarbamic acid (DDTC) or 1,4,7,10,13,16... [more]

The analysis of Pb 2+ , Cu 2+ and Hg 2+ by stripping voltammetry using a Nafion-coated glassy carbon electrode modified with diethyl-dithiocarbamic acid (DDTC) or 1,4,7,10,13,16-hexaoxacyclooctadecane(18-crown-6) is described. Metal ions were accumulated at the electrode by complexing with the ionophore, reduction and detected by differential pulse anodic stripping voltammetry. A five-fold increase in the voltammetric response was achieved at the modified electrode compared to a bare glassy electrode. Parameters and conditions such as the modifier composition, the pH of supporting electrolyte, deposition potential, deposition time, and stripping mode were optimized. For five minutes preconcentration at DDTC in 100 mM KNO 3 , pH 2.5, linear calibration plots in the range 0.5 µM to 50 µM were obtained with a detection limit of 10 nM. For 18-crown-6, after accumulation at open circuit for 1 minute, a linear plot between 2 and 40 µM was achieved. The lifetimes of each electrode were more than three weeks.

Citations Scopus - 28
1999 Chen Z, Adams MA, 'Retention behavior and simultaneous separation of carboxylic and aromatic acids using ion-exclusion chromatography', Journal of Liquid Chromatography and Related Technologies, 22 2595-2611 (1999)

Ion-exclusion chromatography using a high-capacity sulphonated polystyrene-divinylbenzene (PS-DVB) resin was evaluated for the separation of a range of carboxylic and aromatic aci... [more]

Ion-exclusion chromatography using a high-capacity sulphonated polystyrene-divinylbenzene (PS-DVB) resin was evaluated for the separation of a range of carboxylic and aromatic acids. The parameters affecting the retention behaviour of these acids were examined in relation to their chemical structure. Results obtained on the ion-exclusion column for the separation of aromatic acids were similar to those obtained on a C 18 column. The ion-exclusion column exhibited both the ion-exclusion effect for the separation of hydrophilic carboxylic acids and the hydrophobic interaction for the separation of aromatic acids, which offered the possibility of simultaneous separation of carboxylic and aromatic acids by careful selection of separation conditions such as column temperature and content of organic modifier.

DOI 10.1081/JLC-100102046
Citations Scopus - 10
1998 Chen Z, 'Direct determination of phosphate in soil extracts by potentiometric flow injection using a cobalt wire electrode', Analytica Chimica Acta, 363 191-197 (1998)
Citations Scopus - 32
1998 Chen Z, De Marco B, Pejcic B, 'Flow injection potentiometric determination of phosphate in waste waters and fertilisers using a cobalt wire ion-selective electrode', Analyst, 123 1635-1640 (1998)
Citations Scopus - 35
1998 Chen Z, Landman P, Colmer TD, Adams MA, 'Simultaneous analysis of amino and organic acids in extracts of plant leaves as tert-butyldimethylsilyl derivatives by capillary gas chromatography', Analytical Biochemistry, 259 203-211 (1998)
Citations Scopus - 34
1998 Chen Z, Yang XH, Lu XQ, 'Ferric ion selective electrode based on graphite carbon electrode', Electroanalysis, 10 567-570 (1998)
Citations Scopus - 10
1998 Chen Z, Adams MA, 'Non-suppressed conductivity detection of organic acids in plant tissue extracts by ion-exclusion chromatography with aromatic acid eluents', Journal of Liquid Chromatography &Related Technologies, 21 2435-2445 (1998)
Citations Scopus - 8
1998 Chen Z, Alexander PW, 'Potentiometric flow injection detection of copper (II) with a graphite carbon electrode', Analytical Letters, 31 13-25 (1998)

A graphite carbon electrode has been evaluated in a potentiometric flow injection system for the detection of Cu 2+ . The electrode response characteristics were investigated by b... [more]

A graphite carbon electrode has been evaluated in a potentiometric flow injection system for the detection of Cu 2+ . The electrode response characteristics were investigated by both cyclic voltammetry and potentiometry, and it is suggested that the electrode potential change results in the adsorption of Cu 2+ at the electrode surface. The carbon electrode was used for the flow injection potentiometric detection of Cu 2+ in 0.05 mol/L NaAc-0.2 mol/L NaCl at pH of 6.0 carrier solution. A linear response in concentration range of 1x10 -5 -1x10 -2 mol/L was obtained with a detection limit of 5x10 -5 mol/L. The electrode described in this paper is simple and low cost.

Citations Scopus - 3
1998 Chen ZL, Glod BK, Adams MA, 'Indirect photometric detection of aliphatic acids separated by ion-exclusion chromatography using aromatic acidic eluents', Journal of Chromatography A, 818 61-68 (1998)

The use of aromatic acids as eluents for the indirect photometric detection of aliphatic acids in ion-exclusion chromatography is described. A range of aromatic acids (benzoic, sa... [more]

The use of aromatic acids as eluents for the indirect photometric detection of aliphatic acids in ion-exclusion chromatography is described. A range of aromatic acids (benzoic, salicylic, phthalic, trimesic and pyromellitic acids) were investigated to obtain optimal conditions of separation and detection as well as to obtain symmetrical peaks. Phthalic acid was the best compromise among the possible eluents. A theoretical treatment predicts a linear response of peak height to solute concentration. The peak height should also be proportional to the solute dissociation constant and inversely proportional to the dissociation constant and concentration of aromatic acids used as modifiers. These predictions were confirmed experimentally. A linear response was obtained over range of concentrations 0.1-10 mM in 1 mM phthalic acid. The proposed method was demonstrated for use in the analysis of aliphatic acids in extracts of agricultural and Australian native plants. Copyright (C) 1998 Elsevier Science B.V.

DOI 10.1016/S0021-9673(98)00494-4
Citations Scopus - 19
1998 Chen ZL, Adams MA, 'A metallic cobalt electrode for the indirect potentiometric determination of calcium and magnesium in natural waters using flow injection analysis', Talanta, 47 779-786 (1998)

A flow injection analysis of Ca 2+ and Mg 2+ using indirect potentiometric detection in natural Waters is proposed, where Ca 2+ or Mg 2+ are injected into a buffer carrier con... [more]

A flow injection analysis of Ca 2+ and Mg 2+ using indirect potentiometric detection in natural Waters is proposed, where Ca 2+ or Mg 2+ are injected into a buffer carrier containing phosphate, resulting in the formation of Ca 3 (PO 4 ) 2 or Mg 3 (PO 4 ) 2 . The consequent reduction in free phosphate in the carrier solution is detected using a metallic cobalt wire electrode. Indirect electrode response was used and the experimental conditions affecting electrode response were optimized. Responses were linear in the concentration range 5 x 10 -4 to 5 x 10 -3 M with a detection limit of 1 x 10 -5 M in 20 mM phosphate buffer at pH 8.0. The relative standard derivation at 1 mM of Ca 2+ and Mg 2+ were 3.9 and 3.7% (n = 10), respectively. EGTA and 8-hydroxyquinoline were used as the masking agents for Ca 2+ and Mg 2+ , respectively. Concentrations of Ca 2+ and Mg 2+ in natural waters were successfully determined by the proposed method.

DOI 10.1016/S0039-9140(98)00170-2
Citations Scopus - 13
1998 Chen ZL, Alexander PW, 'Potentiometric detection of anions separated by liquid chromatography using a metallic silver wire electrode', Instrumentation Science and Technology, 26 421-431 (1998)

A silver metallic wire electrode, coated with AgCl, used for potentiometric detection of inorganic anions in liquid chromatography, is described. The electrode response to the ani... [more]

A silver metallic wire electrode, coated with AgCl, used for potentiometric detection of inorganic anions in liquid chromatography, is described. The electrode response to the anions was evaluated by both static and flow injection measurements, and results have shown that the electrode exhibits sensitive response to Cl - and SCN - with a detection limit of 10 -6 M. The electrode was used as a potentiometric detector for the determination of anions following separation by ion chromatography using the eluent containing 5 mM phthalate at pH 4.2. Calibration plots were not linear, but give a useful working range of 5 ×10 -5 to 3 × 10 -2 M. It also demonstrated to be a useful detector for the detection of anions separated, where the separation of anions was preformed with a C 18 column using a 0.1 mM octylammonium salicylate as an ion-paring reagent, by ion-pair chromatography. The determination of chloride in waste water samples were demonstrated by proposed method.

Citations Scopus - 7
1997 Chen Z, Hibbert DB, 'Simultaneous amperometric and potentiometric detection of inorganic anions in flow systems using platinum and silver/silver chloride electrodes', Analytica Chimica Acta, 350 1-6 (1997)

Platinum and silver/silver chloride electrodes were evaluated for electrochemical detection (amperometry and potentiometry, respectively) of inorganic anions in flow systems. In f... [more]

Platinum and silver/silver chloride electrodes were evaluated for electrochemical detection (amperometry and potentiometry, respectively) of inorganic anions in flow systems. In flow injection analysis, a linear response over three decades and detection limit of 1x10 -7 M for I - and NO 2 - were obtained at an applied potential of +0.9 V (vs. Ag/AgCl) in 30 mM phosphate buffer at pH 3.0 as carrier. A silver/silver chloride electrode responded potentiometrically to halides and pseudo-halides in this buffer with a detection limit of 1x10 -5 M. The detector, which included both detection systems, was coupled with ion chromatography. Following separation by anion-exchange chromatography with 40 mM phosphate buffer at pH 4.5 as eluent, Cl - , Br - , I - , SCN - , and S 2 O 3 2- were determined potentiometrically with a detection limit of 1x10 -5 M, and, simultaneously, NO 2 - , Br - , I - , and SCN - were determined amperometrically with a detection limit of 1x10 -6 M. Ion-interaction chromatography with an eluent of 20 mM phosphate at pH 5.0 containing 5 mM tetrabutylammonium hydroxide separated and detected Br - , NO 2 - and SCN - .

DOI 10.1016/S0003-2670(97)00328-0
Citations Scopus - 14
1997 Chen Z, Wang SF, 'Determination of steroids in human urine by micellar liquid chromatography', Analytical Letters, 30 2315-2325 (1997)

A simple and sensitive method for the determination of steroids using micellar liquid chromatography is described. The steroids, including hydroxycorticosterone, corticosterone, n... [more]

A simple and sensitive method for the determination of steroids using micellar liquid chromatography is described. The steroids, including hydroxycorticosterone, corticosterone, northisterone, testosterone, mexdroprogesterone acetate and progesterone, were separated by reversed-phase using a micelles mobile phase following UV detection at 245 nm. The parameters affecting retention of the test solutes such as the concentration of sodium dodecyl sulfate (SDS) and n-butanol-1 in the mobile phase were investigated. It was found that the retention of the solutes was dependent on the composition of mobile phase. The linear calibration plots range from 0.1 to 10 µg ml -1 in mobile phase containing 5.0 x 10 -2 mol l -1 SDS/9 % n-butanol-1 at pH 6.0, and the detection limit in order of 0.1 µg ml -1 was obtained. The proposed method was used for the determination of steroids in urine using direct injection of samples without previous treatment.

Citations Scopus - 9
1997 Chen ZL, Hibbert DB, 'Simultaneous amperometric and potentiometric detection of sugars, polyols and carboxylic acids in flow systems using copper wire electrodes', Journal of Chromatography A, 766 27-33 (1997)

Copper wire electrodes, used for amperometric and potentiometric detection in flow injection analysis and high performance liquid chromatography, have been developed for the &apos... [more]

Copper wire electrodes, used for amperometric and potentiometric detection in flow injection analysis and high performance liquid chromatography, have been developed for the 'simultaneous' detection of sugars, polyols and carboxylic acids. Sugars and polyols were oxidised at +0.5 V (versus Ag|AgCI|0.1 M Cl - ) in 100 mM NaOH and citric acid was potentiometrically detected at a copper wire in Milli-Q water. Citric acid, acetic acid, glucose, fructose, glycerol and ethanol were separated by ion-exclusion chromatography with water as eluent and passed through the potentiometric detector then the amperometric detector after addition of 100 mM NaOH. The amperometric detector gave detection limits of 5, 5, 2 and 80 pmol for glucose, fructose, glycerol and ethanol, respectively, with a linear response over 3 decades (10 -6 -10 -3 M). For the potentiometric detector, the detection limits were 10 and 50 pmol for citric acid and acetic acid and linearity was in range of 10 -5 M-10 -3 M. Compared with a universal detector such as refractive index, the reported combination electrochemical detector shows high sensitivity and low detection limits.

DOI 10.1016/S0021-9673(96)00971-5
Citations Scopus - 53
1997 Chen ZL, Alexander PW, 'Potentiometric detection of aliphatic amines by flow injection analysis and ion-interaction chromatography with a metallic copper electrode', Journal of Chromatography A, 758 227-233 (1997)

The detection of aliphatic amines in flow systems with a potentiometric method based on a metallic copper wire electrode is described. The electrode is shown to give sensitive res... [more]

The detection of aliphatic amines in flow systems with a potentiometric method based on a metallic copper wire electrode is described. The electrode is shown to give sensitive response toward aliphatic amines in flow injection analysis. The parameters affecting the response characteristics of the electrode such as the pH of the carrier, the concentration of an ion-interaction reagent and the injection volume were investigated. The metallic copper electrode was applied to the detection of amines after separation by ion-interaction chromatography with a mobile phase containing a low concentration of octylammonium salicylate in unbuffered solution. Detection limits in the range of 0.5-1.0 nmol were obtained in the presence of 0.3 mM octylammonium salicylate at a pH of 6.0 and a flow-rate of 0.3 ml/min. A comparison of the potentiometric detection with conventional UV is given, showing comparable sensitivities. The potentiometric method offers a low cost, easily constructed detector with some possible applications.

DOI 10.1016/S0021-9673(96)00741-8
Citations Scopus - 16
1997 Chen Z, De Marco R, Alexander PW, 'Flow-injection Potentiometric Detection of Phosphates Using a Metallic Cobalt Wire Ion-selective Electrode', Analytical Communications, 34 93-95 (1997)

Flow-injection potentiometric detection of phosphate has been undertaken using a metallic cobalt wire ion-selective electrode. The electrode response to phosphate was characterise... [more]

Flow-injection potentiometric detection of phosphate has been undertaken using a metallic cobalt wire ion-selective electrode. The electrode response to phosphate was characterised by potential readings of high stability versus a Ag/AgCl reference electrode, and results have shown that the electrode displays high sensitivity and selectivity towards the phosphate ion. The metallic cobalt wire electrode was used for the flow-injection potentiometric detection of phosphate using a 0.04 mol l -1 potassium hydrogen phthalate carrier at pH 5.0. A linear response with a slope of -38.00 ± 0.5 mV decade -1 change in phosphate activity was obtained in the range 1.0 × 10 -5 -5.0 × 10 -3 mol l -1 , and the detection limit was 1 × 10 -6 mol l -1 . The phosphate electrode described in this paper is robust, simple to use, highly selective, inexpensive and highly stable.

Citations Scopus - 51
1997 Chen Z, Alexander PW, Haddad PR, 'Liquid chromatography of carboxylic acids using potentiometric detection with a tungsten oxide electrode', Analytical Chimica Acta, 338 41-49 (1997)
Citations Scopus - 18
1997 Chen Z, Alexander PW, 'Potentiometric detection of metal ions separated by liquid chromatography using a tungsten oxide electrode', Electroanalysis, 9 141-144 (1997)
DOI 10.1002/elan.1140091103
1997 Chen Z, Lu XQ, Yang XH, 'Characteristics of copper(II) ion-selective electrode based on aquatic humic substances', Electroanalysis, 9 1278-1282 (1997)
Citations Scopus - 4
1997 Chen Z, Alexander PW, 'Potentiometric flow-injection analysis of alkali and alkaline metals with a tungsten oxide coated nafion film sensor', Laboratory Robotics and Automation, 9 201-206 (1997)
1997 Chen Z, Alexander PW, 'Potentiometric Detection of Metal Ions Separated by Liquid Chromatography Using a Tungsten Oxide Electrode', Electroanalysis, 9 818-821 (1997)

The use of a tungsten oxide sensor for the potentiometric detection of metal ions separated by liquid chromatography is described. Separation of metal ions such as Fe 3+ , Fe 2+, ... [more]

The use of a tungsten oxide sensor for the potentiometric detection of metal ions separated by liquid chromatography is described. Separation of metal ions such as Fe 3+ , Fe 2+, Cu 2+ and Pb 2+ was performed by ion chromatography using a mobile phase containing 25 mM sodium tartrate/2 mM ethylenediamine at pH 3.8. Calibration plots were linear in the range 0.5 to 3.5 mM. Potentiometric detection was also applied to ion-interaction chromatography. The results showed that separation of metal ions was improved and the detection limits for the test metals in the range of 0.5-5 nmol were obtained in the presence of sodium citrate/1-octanesulfonic acid at pH 3.0. The potentiometric detection described in this article is shown to have advantages in terms of low cost, simplicity and sensitivity.

Citations Scopus - 4
1997 Chen Z, Yu JJ, Hibbert DB, 'Flow Injection, Amperometric Determination of Ethanol in Wines after Solid-Phase Extraction', Electroanalysis, 9 541-543 (1997)

Ethanol in wines was determined by flow injection analysis with an amperometric detector using an oxidized nickel wire. Solid-phase extraction with a strong anion exchanger was us... [more]

Ethanol in wines was determined by flow injection analysis with an amperometric detector using an oxidized nickel wire. Solid-phase extraction with a strong anion exchanger was used to remove interferences such as organic acids from the matrix, and the residue of the extraction was injected directly into the FIA system. The recoveries of ethanol from wines spiked with standards ranged from 101 % to 103 %. The response of the nickel electrode to ethanol is dependent on the applied potential and the pH of the carrier. The optimal conditions for the detection of ethanol were an applied potential of +0.60 V (vs. Ag/AgCl) in a carrier of 100 mM sodium hydroxide solution. The electrode exhibited a linear response from 10 -5 to 10 -3 M, with a detection limit of 1 × 10 -6 M. The method was demonstrated by the determination of ethanol in wines.

Citations Scopus - 7
1996 Chen Z, Alexander PW, 'Potentiometric detection of carboxylic acids by flow injection analysis using a tungsten oxide electrode', Analytical Chimica Acta, 332 187-192 (1996)
Citations Scopus - 13
1995 Chen Z, Zhao Y, Chen B, Sorrell CC, He YY, Zuge XB, 'Magnetic-filed-dependent vortex-glass scaling behaviour in V-Doped YBa2Cu3O7-Y system', Physica C, 248 328-334 (1995)
1995 Chen Z, Zhao Y, Chio B, Chen B, Sorrell CC, He YY, 'Effect of weak links on the scaling behaviour of IV-curves in a melt-textured YBa2Cu3O7-Y system. Physics Letter, 203:53-57.', Physics Letters A, 203 55-57 (1995)
DOI 10.1016/0375-9601(95)00382-D
1995 Glód BK, Alexander PW, Chen ZL, Haddad PR, 'Thermodynamic investigation of sample retention mechanism in ion-exclusion chromatography with inclusion compound in the mobile phase', Analytica Chimica Acta, 306 267-272 (1995)

In this paper the retention mechanism of the solute retention in ion-exclusion chromatography with ß-cyclodextrin in the mobile phase is presented. The values of the adsorption a... [more]

In this paper the retention mechanism of the solute retention in ion-exclusion chromatography with ß-cyclodextrin in the mobile phase is presented. The values of the adsorption and inclusion constants are estimated from the dependence of solute retention on cyclodextrin concentration. From the van't Hoff dependence the entropy and enthalpy changes are determined. It was found that increase of the temperature decreases the adsorption and the complexation constants. For adsorption negative values were obtained for enthalpy and entropy changes. Negative values for enthalpy and positive values for entropy changes were obtained for complexation. © 1995.

DOI 10.1016/0003-2670(94)00683-D
Citations Scopus - 13
1995 Gold BK, Alexander PW, Haddad PR, Chen ZL, 'Potentiometric detection using a metallic copper electrode in reversed-phase and ion-exclusion chromatography with eluents containing ion-interaction reagents', Journal of Chromatography A, 699 31-37 (1995)

The response characteristics of a metallic copper wire electrode used as a sensor electrode in a potentiometric detector after ion-interaction separations are determined. Volatile... [more]

The response characteristics of a metallic copper wire electrode used as a sensor electrode in a potentiometric detector after ion-interaction separations are determined. Volatile carboxylic acids have been selected as model compounds to test the sensor electrode. It is found that concentrations of an ion-interaction reagent (tetraethylammonium perchlorate) as small as 0.01 mM in an unbuffered mobile phase are optimal for the potentiometric detection and separation in two chromatographic systems, namely reversed-phase and ion-exclusion. The ion-interaction reagent gives improved solute peak shape and results in retention times becoming independent of solute concentration, without any adverse effect on detection sensitivity. An increase in the mobile phase concentration of the reagent results in increased solute retention in the ion-exclusion chromatography mode and variation of this concentration is a new parameter that can be used to control solute retention. Typical detection limits are 250, 510 and 360 pmol for acetic, propionic and butyric acids, respectively. © 1995.

DOI 10.1016/0021-9673(95)00046-P
Citations Scopus - 14
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Conference (4 outputs)

Year Citation Altmetrics Link
2016 Faustorilla M, Chen Z, Dharmarajan R, Naidu R, 'Solid phase extraction and fractionation of total petroleum hydrocarbons in contaminated soil by GC-MSD/FID techniques', Journal of Chromatography and Separation Techniques (2016)
DOI 10.4172/2157-7064.C1.020
Co-authors Ravi Naidu, Raja Dharmarajan
2015 Faustorilla V, Chen Z, Dharmarajan R, Mallavarapu M, Naidu R, 'Solid phase extraction and fractionation of total petroleum hydrocarbons in contaminated soil by GC-MSD technique' (2015) [E3]
Co-authors Ravi Naidu, Raja Dharmarajan
2015 Faustorilla V, Nanayakkara A, Chen Z, Dharmarajan R, Naidu R, 'Refined LVI-PTV-GC-MS for analysis of low level polycyclic aromatic hydrocarbons in contaminated groundwater and soil samples' (2015) [E2]
Co-authors Raja Dharmarajan, Ravi Naidu
2015 Wang L, Chen Z, Naidu R, 'ANALYTE ION DETECTION METHOD AND DEVICE (ProbeCARE TM )' (2015)
Co-authors Ravi Naidu, Liang Wang
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Patent (1 outputs)

Year Citation Altmetrics Link
2012 Wang L, Naidu R, Chen Z, mallavarapu M, Analyte Ion Detection Method and Device (2012)
Co-authors Megh Mallavarapu, Liang Wang, Ravi Naidu
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Grants and Funding

Summary

Number of grants 2
Total funding $580,441

Click on a grant title below to expand the full details for that specific grant.


20122 grants / $580,441

Green synthesis of iron nanoparticles and their application as a Fenton-like catalyst for the degradation of TPHs in ground water and oil sludge$362,441

Funding body: CRC - CRC - Cooperative Research Centre

Funding body CRC - CRC - Cooperative Research Centre
Scheme University of Newcastle
Role Lead
Funding Start 2012
Funding Finish 2015
GNo
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON N

Measurement of total petroleum hydrocarbon in soils and sediments $218,000

Funding body: Cooperative Research Centre

Funding body Cooperative Research Centre
Scheme Cooperative Research Centre
Role Lead
Funding Start 2012
Funding Finish 2015
GNo
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON N
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Research Supervision

Number of supervisions

Completed1
Current3

Total current UON EFTSL

PhD0.9

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2016 PhD Coupling Modified Bamboo Charcoal Immobilized Bacteria and Fenton Oxidation by Iron Based Nanoparticles for the Remediation of Antibiotic-Amoxicillin PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2015 PhD Modelling of dry spray desulfurization and denitrification reactors for integrated combustion flue gas cleaning PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2015 PhD Bio-Electrochemical Systems for Electricity and Hydrogen Production PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2016 PhD Green Synthesis of Iron Nanomaterials by Grape Leaf Extract and their Application in Removal of Contaminants PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
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Dr Zuliang Chen

Position

Conjoint Associate Professor
Global Centre for Environmental Remediation (GCER)
Global Centre for Environmental Remediation
Faculty of Science

Contact Details

Email zuliang.chen@newcastle.edu.au

Office

Room ATC
Building Advanced Technology Centre.
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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