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A Novel Method of the Preparation ofChemically Modified Electrodes
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作者 LI Gen-xi LIAO Xiang-min FANG Hui-qun and CHEN Hong-yuan(Department of Chemistry,Institute of Coordination Chemistry ,Nanjing University,Manjing,210008 ) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1995年第1期67-70,共4页
ANovelMethodofthePreparationofChemicallyModifiedElectrodesLIGen-xi,LIAOXiang-min,FANGHui-qunandCHENHong-yuan... ANovelMethodofthePreparationofChemicallyModifiedElectrodesLIGen-xi,LIAOXiang-min,FANGHui-qunandCHENHong-yuan(DepartmentofChem... 展开更多
关键词 chemically modified electrodes Preparation method silver Phenoth-iazine HEMOGLOBIN
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A Glassy Carbon Electrode Modified with Cellulose Nanofibrils from Ammophila arenaria for the Sensitive Detection of L-Trytophan
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作者 Sondes Bourigua Feriel Boussema +4 位作者 Zayneb Jebali Houcine Barhoumi Hatem Majdoub Abderrazak Maaref Nicole Jaffrezic-Renault 《Journal of Sensor Technology》 2024年第3期35-50,共16页
L-tryptophan is an essential amino acid for human health. Nanofibrillated cellulose (NFC) from marram grass (Ammophila arenaria) extracted from plants harvested in the center of Tunisia was used for the first time for... L-tryptophan is an essential amino acid for human health. Nanofibrillated cellulose (NFC) from marram grass (Ammophila arenaria) extracted from plants harvested in the center of Tunisia was used for the first time for the modification of a glassy carbon electrode (GCE), for the sensitive detection of L-tryptophan (Trp). After spectroscopic and morphological characterization of the extracted NFC, the GC electrode modification was monitored through cyclic voltammetry. The NFC-modified electrode exhibited good analytical performance in detecting Trp with a wide linear range between 7.5 × 10−4 mM and 10−2 mM, a detection limit of 0.2 µM, and a high sensitivity of 140.0 µA∙mM−1. Additionally, the NFC/GCE showed a good reproducibility, good selectivity versus other amino acids, uric acid, ascorbic acid, and good applicability to the detection of Trp in urine samples. 展开更多
关键词 Nanofibrillated Cellulose CHITOSAN chemically modified Glassy Carbon Electrode Electrochemical Detection L-TRYPTOPHAN
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Unique Nafion-Os(bpy)3^(2+) Modified Electrodes
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作者 Pei Fang LIU Jun Tao LU Jia Wei YAN(Department of Chemistry. Wuhan University. Wuhan 430072) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第10期857-860,共4页
It was newly found that the electrodes modified by applying ethanol solutions of Nationcontaining os(bpy)32+ onto the substrate electrode (the one-step method) show two pairs of stableredox peaks of Os(bpy)32+/3+ on c... It was newly found that the electrodes modified by applying ethanol solutions of Nationcontaining os(bpy)32+ onto the substrate electrode (the one-step method) show two pairs of stableredox peaks of Os(bpy)32+/3+ on cyclic voltammogram near 0.54V and 0.25V, respectively. Thesemoditied electrodes can effectively mediate and catalyze the first and second steps of nitritereduction in acidic media in the potential region 0-0.9V when the loading in the coating (X=F(Os2+) / F(SO3-)) and pH in solution are below 0. 17 and 4, respectively. When X is between 0.33and 0. 17. only the current peak near 0.54V appears regardless of solution pH and only the first stepof NO2 reduction is catalyzed. Thus the modified electrode provides a very useful flexibility thatone can control the reaction pathway and catalytic activity of nitrite reduction by simply changingthe concentration of the mediator in the coating. 展开更多
关键词 chemically modified electrodes nitrite reduction electro-catalysis. sensors.
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Electrochemical Behavior of Eu^(3+) on Eastman AQ-29D Chemically Modified Electrode
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作者 叶宪曾 卜一工 李南强 《Journal of Rare Earths》 SCIE EI CAS CSCD 1994年第1期48-51,共4页
The electrochemical behaviors of Eu3+ on Eastman AQ-29D/glassy carbon(GC) chemically modified electrode(CME) were studied. It was found that the reduction-oxidation process of Eu3+ is in a semi-infinite condition in 0... The electrochemical behaviors of Eu3+ on Eastman AQ-29D/glassy carbon(GC) chemically modified electrode(CME) were studied. It was found that the reduction-oxidation process of Eu3+ is in a semi-infinite condition in 0.1 mol/L NaCIO4 supporting electrolyte(pH 4.4). The calibration curve was linear over the range 1.0×10-7 to 1.0×105 mol/L of Eu3+.The charge transport apparent diffusion coefficient of Eu3+ in the polymer film was determined to be(3.2±1.1)×10-11cm2/s by chronocoulometry. 展开更多
关键词 EUROPIUM chemically modified electrode(CME) Eastman AQ-29D CHRONOCOULOMETRY
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Cyclic Voltammetric Responses of Nitrate Reductase on Chemical Modified Electrodes
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作者 YaRuSONG HuiBoSHAO 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第7期653-654,共2页
Electrochemistry of nitrate reductases (NR) incorporated into 2-aminoethanethiol self-assembled on the gold electrode and polyacrylamide cast on the pyrolytic graphite electrode was examined. NR on chemical modified ... Electrochemistry of nitrate reductases (NR) incorporated into 2-aminoethanethiol self-assembled on the gold electrode and polyacrylamide cast on the pyrolytic graphite electrode was examined. NR on chemical modified electrode showed electrochemical cyclic voltammetric responses in phosphate buffers. 展开更多
关键词 NR cyclic voltammetric response chemical modified electrode.
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Electrochemical Behaviour of Europium-Ferrocene Derivative Complex Chemi cally Modified Electrodes
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作者 YANG Qing-hua, YE Xianzeng, HUANG Chun-hui (College of Chemical and Molecular Engineering, Peking University, Beijing 100871, China) 《Journal of Rare Earths》 SCIE EI CAS CSCD 2000年第1期13-13,共1页
Electrochemical behaviours of Europium-ferrocene derivative complex chemically modified electrodes were studied in the paper. Various factors which affect the voltammetry of the thin film modified electrodes, and the... Electrochemical behaviours of Europium-ferrocene derivative complex chemically modified electrodes were studied in the paper. Various factors which affect the voltammetry of the thin film modified electrodes, and the charge transport process of the thin film electrode were discussed. Size of the hydrated anion (counter ion), concentration of the electrolyte, swelling property of the film in the solvent and thickness of the film have significant effects on the voltammetry of the thin film electrode. Electrochemical behaviours of europium-ferrocene derivative compelx chemically modified electrode were studied in an aqueous solution. When scan ning between 0-0.8 V (vs. SCE), experimental results indicate that the chemically modified electrode has good stability and reproducibility. The apparent rate constant of electrode reaction is deteminedd to be 6.7×10-1 s-1. 展开更多
关键词 rare earths europium. ferrocene derivative coordination. chemically modified electrode thin film electrode
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Electrocatalytic oxidation of methanol at platinum electrode modified with Eu-Fe cyanide-bridged binuclear complexes 被引量:3
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作者 Ma, Yong Jun Pan, Yu Ying +2 位作者 Wang, Wei Feng Yang, Mei Xia Zhou, Min 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第3期337-340,共4页
The electrocatalytic oxidation of methanol at the platinum electrode modified with Eu-Fe cyanide-bridged binuclear complexes (Eu-Fe film) was investigated for the first time by cyclic voltammetry.Compared with the bar... The electrocatalytic oxidation of methanol at the platinum electrode modified with Eu-Fe cyanide-bridged binuclear complexes (Eu-Fe film) was investigated for the first time by cyclic voltammetry.Compared with the bare platinum electrode,the results showed that the modified electrode had excellent electrocatalytic activity for the oxidation of methanol;the oxidation peak potential shifted more negatively and the peak current increased about twenty times.The electrooxidation of methanol at the modified elect... 展开更多
关键词 METHANOL ELECTROCATALYSIS Cyanide-bridged binuclear complexes EUROPIUM chemically modified electrode
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Study of the electrochemical properties of a transition metallic ions modified electrode in acidic VOSO_4 solution 被引量:3
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作者 WANG Wenhong WANG Xindong 《Rare Metals》 SCIE EI CAS CSCD 2007年第2期131-135,共5页
Graphite material was used as the electrode for an all-vanadium redox flow battery, and the electrode was modified by transition metallic ions to enhance its electrochemical behavior. An porous graphite composite elec... Graphite material was used as the electrode for an all-vanadium redox flow battery, and the electrode was modified by transition metallic ions to enhance its electrochemical behavior. An porous graphite composite electrode has high specific surface area and high current density. The electrode modified by transition metallic ions has improved catalysis behavior that can catalyze the V(Ⅱ)-V(Ⅴ) redox reaction showed by cyclic voltammograms. This article studied the impedance of the modified electrode by electrochemical impedance spectroscopy (EIS), and approved that the electrode modified by Co^2+ and Mn^2+ has a lower charge transfer resistance than the non-modified electrode. The effect of average particle size distribution is at lower frequencies that the slope of Warburg impedance is reduced by large particle size distribution. The voltage efficiency of the Co^2+ modified electrode test cell is 81.5%, which is higher than that of the non-modified electrode. 展开更多
关键词 secondary energy source redox flow battery porous electrode ac impedance chemical modified electrode
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Determination of 6-Mercaptopurine in Rat Blood by Microdialysis Coupled with High Performance Liquid Chromatography on a Functionalized Multi-wall Carbon Nanotubes Modified Electrode 被引量:1
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作者 LINLi QIUPei-hong +2 位作者 XIEXia-feng CAOXu-ni JINLi-tong 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第2期141-144,共4页
A new chemically modified electrode(CME) immobilized on the surface of multi-wall carbon nanotubes functionalized with carboxylic groups was fabricated. The results indicate that the CME exhibits efficiently electroca... A new chemically modified electrode(CME) immobilized on the surface of multi-wall carbon nanotubes functionalized with carboxylic groups was fabricated. The results indicate that the CME exhibits efficiently electrocatalytic oxidation of 6-mercaptopurine(6-MP). The CME can be used as the working electrode in the liquid chromatography for the determination of 6-MP. The peak current of 6-MP is linearly changed with its concentration ranging from 4.0×10 -7 to 1.0×10 -4 mol/L with the calculated detection limit (S/N=3) of 2.0×10 -7 mol/L. Coupled with microdialysis sampling, the method has been successfully applied to assessing the content of 6-MP in rat blood. 展开更多
关键词 MERCAPTOPURINE Multi-wall carbon nanotube Chemical modified electrode HPLC Microdialysis sampling
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Copper modified platinum electrode for amperometric detection of spectinomycin sulfate by anion-exchange chromatography 被引量:1
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作者 Ling Ling Xi Pei Min Zhang Yan Zhu 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第10期1245-1247,共3页
A La^3+-Cu/Pt modified electrode was fabricated by electrodepositing process in CuS04 solution by adding a small amount of lanthium compound, and it was employed for direct current (DC) amperometric detection of sp... A La^3+-Cu/Pt modified electrode was fabricated by electrodepositing process in CuS04 solution by adding a small amount of lanthium compound, and it was employed for direct current (DC) amperometric detection of spectinomycin by anion-exchange chromatography. Without derivatization, this method can simultaneously determine the main component and impurities in spectinomycin pharmaceutical raw material. Ease of preparation, being applied in DC detection mode and good catalytic stability confirmed the interests of this modified electrode as amperometric sensor for the determination of spectinomycin. 展开更多
关键词 Copper/platinum chemically modified electrode High performance anion-exchange chromatography Direct current amperometricdetection SPECTINOMYCIN
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Indirect Differential Pulse Voltammetric Determination of Aluminum by a Pyrocatechol Violet-Modified Electrode
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作者 Shu Ping BI Gang CHEN(Department of Chemistry. Naming University, Naming 210093) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第3期247-250,共4页
A PCV-modified electrode was simply prepared by dip-coating a pyrolytic graphite electrode in a NaAc-HAc buffer solution of PCV. The peak currents of differential pulse voltammograms (DPV) decrease with the addition o... A PCV-modified electrode was simply prepared by dip-coating a pyrolytic graphite electrode in a NaAc-HAc buffer solution of PCV. The peak currents of differential pulse voltammograms (DPV) decrease with the addition of Al and the peak potentials remain the same. The decreasing of Delta i(p) is linear with Al concentration in the range of 1 x 10(-8) similar to 1 x 10(-7) mol/L. The detection limit is 5 x 10(-9) mol/L and the relative standard deviation for 4 x 10(-8) mol/L Al is 2.9% (n=8). No serious interference was found. The determination of Al in water samples is reported. 展开更多
关键词 pyrocatechol violet (PCV) ALUMINUM chemically modified electrode differential pulse voltammetry indirect determination drinking water
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Studies on the Electrochemistry of Dopamine at a Pyrocatechol Sulfonephthalein Modified Glassy Carbon Electrode
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作者 CAI Chen-xin and XUE Kuan-hong (Department of Chemistry, Nanjing Normal University, Nanjing 210097, P. R. China) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2000年第1期42-48,共7页
The electrochemical response of dopamine(DA) at a pyrocatechol sulfonephthalein modified glassy carbon(PS/GC) electrode is reported. The electrode can be used as a detector for the determination of dopamine with a hi... The electrochemical response of dopamine(DA) at a pyrocatechol sulfonephthalein modified glassy carbon(PS/GC) electrode is reported. The electrode can be used as a detector for the determination of dopamine with a high stability and a good sensitivity. The cyclic voltammetric results indicated that there was a couple of well-defined redox peaks for dopamine at the PS/GC electrode with E_(pa)= 220 mV, E_(pc)=95 mV and the formal potential E^(o')= 157. 5 mV(vs. SCE) at 100 mV/s in the buffer solution of pH 7. 0. The PS/GC electrode can also be used to separate the electrochemical responses of ascorbic acid and DA by 54 mV with the differential pulse voltammetry. Under the selected conditions, the oxidation peak currents are linear with DA concetration in the range of 5. 0 × 10^(-6) to 5. 0 × 10^(-4) mol/L, and the detection limit is 1. 0 ×10^(-6) mol/L at S/N=3. Normalized with concentration, the relative sensitivity of dopamine to ascorbic acid reaches ca. 30. 8: 1. 展开更多
关键词 chemically modified electrode NEUROTRANSMITTER DOPAMINE Ascorbic acid Pyrocatechol sulfonephthalein
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Studies on the Erythromycin-Modified Glassy Carbon Electrod and Interaction with DNA
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作者 Xiao Quan LU Xi Bin ZHOU +2 位作者 Jing Wan KANG Zai Xin GENG Jin Zhang GAO(Institute of Chemistry, Northwest Normal University, Lanzhou 730070) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第4期307-310,共4页
The chemically modified electrode (CME) which was constructed by covalent attaching erythromycin (ERM) to the glassy carbon (GC) surface was investigated in Tris-HCl buffer (pH=6.0) by cyclic voltammetry (CV) and diff... The chemically modified electrode (CME) which was constructed by covalent attaching erythromycin (ERM) to the glassy carbon (GC) surface was investigated in Tris-HCl buffer (pH=6.0) by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). In the potential range of -0.5~0.4V, CME yields a pair of stable redox wave. It is the carbonyl group of the ERM molecule immobilized on the GC surface that undergoes two electron redox process involving two protons. The interaction of CME with DNA was also studied by DPV. The CME shows the same interaction with DNA as that in the solution. And the result was proved by fluorescence. 展开更多
关键词 Erthromycin chemically modified electrode VOLTAMMETRY INTERACTION DNA
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Electrochemical Determination of Trace Amounts of Lead (Ⅱ) and Cadmium (Ⅱ) at a Calix[6]arene Modified Carbon Paste Electrode
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作者 JIXiao-bo WUYun-hua FEIJun-jie HUSheng-shui 《Wuhan University Journal of Natural Sciences》 CAS 2004年第6期943-948,共6页
An electrochemical method for the simultaneous determination of lead(II) and Cadmium(II) with a calix[6]arene modified carbon paste electrode (CPE) has been developed. Pb2+ and Cd2+ were accumulated at the surface of ... An electrochemical method for the simultaneous determination of lead(II) and Cadmium(II) with a calix[6]arene modified carbon paste electrode (CPE) has been developed. Pb2+ and Cd2+ were accumulated at the surface of the modified electrode via formation of chemical complexes with calix[6]arene, and reduced at 1.40 V. During the following anodic potential sweep, reduced lead and cadmium were oxidized, and two well-defined striping peaks appeared at about ?0.60 V and ?0.84 V. Compared with a bare carbon paste electrode, the calix[6]arene modified CPE greatly improves the sensitivity of determining lead and cadmium. The stripping peak currents change linearly with the concentration of Pb2+ 3.0×10?8–8.0×10?6 mol·L?1 and with that of Cd2+ 6.0×10?8–1.0×10?5 mol ·L?1. The detection limits of Pb2+ and Cd2+ are found to be 8.0×10?9 mol·L?1 and 2.0×10?8 mol·L?1, respectively. The modified carbon paste electrode was applied to determine trace levels of lead and cadmium in water samples. Comparing with that of atomic absorption spectrometry, the results suggests that the calix[6]arene modified CPE has great potential for the practical sample analysis. Key words lead(II) - cadmium(II) - calix[6]arene - differential pulse stripping voltammetry - chemically modified electrode CLC number O 657.15 Foundation item: Supported by the National Natural Science Foundation of China (60171023)Biography: JI Xiao-bo (1980-), male, Master, research direction: electroanalytical chemistry. 展开更多
关键词 lead(II) cadmium(II) CALIX[6]ARENE differential pulse stripping voltammetry chemically modified electrode
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Electrochemical Behavior and Its Electrocatalytic Activity of A P-Mo Heteropolyanion Modified ITO Electrode
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作者 Xiao Feng QIU Jin Zhong XU +1 位作者 Jun Jie ZHU Hong Yuan CHEN 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第7期649-652,共4页
s: A new method for the preparation of an organic-inorganic composite film of the heteropolyanion has been developed by modifying P(Mo2O7)6-7 to the indium tin oxide (ITO) electrode surface. The modified electrode dis... s: A new method for the preparation of an organic-inorganic composite film of the heteropolyanion has been developed by modifying P(Mo2O7)6-7 to the indium tin oxide (ITO) electrode surface. The modified electrode displayed a strong catalytic activity towards the reduction of IO3-. In the range of 1.0?0-6~5?0-4mol/L, the catalytic current was linear proportional to the IO3- concentration. 展开更多
关键词 chemically modified electrode HETEROPOLYANION indium tin oxide electrode IO_(3)^(-).
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Ion Recognition and Analytical Application of a Fibroin Modified Electrode
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作者 QiongCHENG TuZhiPENG +1 位作者 XiaoBoHU CatherineF.YANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第12期1473-1476,共4页
A novel fibroin modified electrode with ion recognition was reported. The membranewith isoelectric point of pH 4.5, was modified on graphite and carbon fiber electrodes. ThepH-responsive ion recognition of the modifie... A novel fibroin modified electrode with ion recognition was reported. The membranewith isoelectric point of pH 4.5, was modified on graphite and carbon fiber electrodes. ThepH-responsive ion recognition of the modified electrode was investigated by use of someneurocompounds. The fibroin carbon fiber electrode has been used for in-vivo determination. 展开更多
关键词 Silk fibroin pH-responsive ion selectivity chemically modified electrode
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Bi_(2)O_(3)/ZnO nanocomposite:Synthesis,characterizations and its application in electrochemical detection of balofloxacin as an antibiotic drug 被引量:3
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作者 Sana Ansari M.Shahnawaze Ansari +1 位作者 Soami P.Satsangee Rajeev Jain 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2021年第1期57-67,共11页
In the present work,a chemically modified electrode has been fabricated utilizing Bi_(2)O_(3)/ZnO nanocomposite.The nanocomposite was synthesized by simple sonochemical method and characterized for its structural and ... In the present work,a chemically modified electrode has been fabricated utilizing Bi_(2)O_(3)/ZnO nanocomposite.The nanocomposite was synthesized by simple sonochemical method and characterized for its structural and morphological properties by using XRD,FESEM,EDAX,HRTEM and XPS techniques.The results clearly indicated co-existence of Bi_(2)O_(3) and ZnO in the nanocomposite with chemical interaction between them.Bi_(2)O_(3)/ZnO nanocomposite based glassy carbon electrode(GCE)was utilized for sensitive voltammetric detection of an anti-biotic drug(balofloxacin).The modification amplified the electroactive surface area of the sensor,thus providing more sites for oxidation of analyte.Cyclic and square wave voltammograms revealed that Bi_(2)O_(3)/ZnO modified electrode provides excellent electrocatalytic action towards balofloxacin oxidation.The current exhibited a wide linear response in concentration range of 150e1000 nM and detection limit of 40.5 nM was attained.The modified electrode offered advantages in terms of simplicity of preparation,fair stability(RSD 1.45%),appreciable reproducibility(RSD 2.03%)and selectivity.The proposed sensor was applied for determining balofloxacin in commercial pharmaceutical formulations and blood serum samples with the mean recoveries of 99.09% and 99.5%,respectively. 展开更多
关键词 ZnO nanoparticles chemically modified electrode VOLTAMMETRY Drug analysis
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Electrochemical Properties of Polypyrrole-Coated Microelectrode Array and the Fabrication of Polypyrrole-Based Microelectronic Devices 被引量:2
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作者 CAI Chen-xin,JU Huang-xian and CHEN Hong-yuan (Department of Chemistry,Nanjing University,Nanjing,210093) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1995年第2期163-169,共7页
Conducting polymers have been studied extensively. An interesting property of the conducting polymer is that the conductivity of some polymers, such as polypyrrolc, polyaniline, poly(3-methylthiophene) etc. , is affec... Conducting polymers have been studied extensively. An interesting property of the conducting polymer is that the conductivity of some polymers, such as polypyrrolc, polyaniline, poly(3-methylthiophene) etc. , is affected by the voltage applied to them. For polypyrrole, the oxidized state is an electronic conductor and the reduced state is essentially insulating. Using this property, one can fabricate the polymer-based electronic devices. Experimental results of Pickun 展开更多
关键词 MICROELECTRODE Microeiectrode array chemically modified electrode Polymer-based electronic devices POLYPYRROLE
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Direct Electrochemistry with Nitrate Reductase in Chitosan Films
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作者 XiaoXiaCHEN JingBoHU +1 位作者 HongWU HuiBoSHAO 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第4期447-448,共2页
Stable films made from chitosan (CS) on pyrolytic graphite electrode (PGE) gave direct electrochemistry for incorporated enzyme nitrate reductase (NR). Cyclic voltammetry of CS / NR films showed a pair of well-defined... Stable films made from chitosan (CS) on pyrolytic graphite electrode (PGE) gave direct electrochemistry for incorporated enzyme nitrate reductase (NR). Cyclic voltammetry of CS / NR films showed a pair of well-defined and nearly reversible redox peaks at about -0.430 V vs. SCE at pH 7.0 phosphate buffers. 展开更多
关键词 Nitrate reductase CHITOSAN cyclic voltammetry chemical modified electrode.
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Electrocatalytic Oxidation and Ion Chromatography Detection of S_2O^(2-)_3, SO^(2-)_3, I^- and SCN^- at Glassy Carbon Electrode with Functionalized Multi-Wall Carbon Nanotubes Film
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作者 XUJi-ming WANGYan-ping +1 位作者 XIANYue-zhong JINLi-tong 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2004年第5期529-533,共5页
In this research, a glassy carbon electrode modified with the functionalized multi-wall carbon nanotubes(MWNT-COOHs) film was used as an amperometric sensor for the determination of S_2O^(2-)_3, SO^(2-)_3, I^- and SCN... In this research, a glassy carbon electrode modified with the functionalized multi-wall carbon nanotubes(MWNT-COOHs) film was used as an amperometric sensor for the determination of S_2O^(2-)_3, SO^(2-)_3, I^- and SCN^-. The electrochemical behavior of those oxidizable inorganic anions at this modified electrode was studied by means of cyclic voltammetry(CV). The experimental results indicate that the modified electrode exhibits a high electrocatalytic activity towards the oxidation of those anions with a relatively high sensitivity, a good stability and a long-life. Separated by ion chromatography(IC) with 1.25 mmol/L H_2SO_4 as an eluent, those oxidizable anions can be determined by the MWNT-COOHs modified electrode successfully. Under the optimal chromatographic conditions, the detection limits are 1.5×10^(-7) mol/L for S_2O^(2-)_3, 2.5×10^(-7) mol/L for SO^(2-)_3, 1.2×10^(-7) mol/L for I^- and 2.0×10^(-7) mol/L for SCN^-, respectively. The method was applied successfully to the determination of those anions in environmental water 展开更多
关键词 Amperometric detection MWNT-COOHs chemically modified electrode Ion chromatography
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