| A Study on Adsorption of Electrogenerated Cystine Precipitate onto An Electrode using Electrochemical Quartz Crystal Impedance System |
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| 作者姓名： | You Yu ZHANG Qing Ji XIE Yang Hui GUO Xiang Jun WANG Shou Zhuo YAO |
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| 作者单位： | Chemical Research Institute. Hunan Normal University，Changsha 410081 |
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| 摘 要： | Insiluquartzcrystalimpedance(QCI)measurementduringelectrochemicalperturbationshasfoundwideapplicationsininvestigatingmetalandpolymerdepositionetc'-',asitprovidesmultidimensionalinsitupiezoelectricinformation.QCIanalysishasbeenbasedontheButterworth-VanDyke(BVD)equivalentelectricalcircuitcomposedofamotionalarmandastaticarminparallel.Themotionalarmcontainsthreeequivalentcircuitelementsinseries,namely,themotionalresistanceRI,themotionalinductanceL,andthemotionalcapacitanceC,,whilethestaticar…
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A Study on Adsorption of Electrogenerated Cystine Precipitate onto An Electrode using Electrochemical Quartz Crystal Impedance System |
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| You Yu ZHANG, Qing Ji XIE, Yang Hui GUO, Xiang Jun WANG, Shou Zhuo YAO.A Study on Adsorption of Electrogenerated Cystine Precipitate onto An Electrode using Electrochemical Quartz Crystal Impedance System[J].Chinese Chemical Letters,1999(12). |
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| Authors: | You Yu ZHANG Qing Ji XIE Yang Hui GUO Xiang Jun WANG Shou Zhuo YAO |
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| Abstract: | An electrochemical quartz crystal impedance system has been applied to monitorgeneration of precipitate and adsorption of the precipitate onto An electrode during electrochmicaloxidation and Fe(CN)_6,3-/Fe(CN),6 4- electrochemical catalytic oxidation of L-cysteine in phosphateaqueous buffer (pH 7.4). Significant decreases in the resonant frequency and increases in themotional resistance and the static capacitance were found during the precipitate adsorption, and thefrequency shift found in solution was ca. 2 times that in air. Similar responses of quartz crystalimpedance and a white precipitate were obtained during redox titration of L-cysteine solutionusing K_3Fe(CN)_6 solution. FT-IR analysis indicated that the white precipitate is cystine. Theelectrode collection efficiency of the electrogenerated cystine was estimated. |
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| Keywords: | Electrochemical quartz crystal impedance system adsorption of electrogeneratedprecipitate cystine/cysteine Fe(CN)_6 3-/Fe(CN)_6 4- |
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