Studies on the Determination of Platinum for A Chitosan Chemically Modified Electrode

Abstract

Abstract: A chitosan-containing glassy carbon electrode was found to give highly sensitive voltammetric wave for Pt(Ⅳ)-HCl-KCl system by anodic stripping voltammetry.Various conditions for the determination of trace Pt(Ⅳ)were studied.The optimum chitosan amount in glassy carbon was 4μLof 1%chitosan.In a solution of 0.04 mol/L HCl-KCl(pH2.2),at-0.3 Vdeposited for 2 min, scan rate was 0.2V/s, the anodic stripping potential was-0.16 V(vs.SCE).The peak current is proportional to the Pt(Ⅳ)concentration between 0.5～5.0 μg/mL,r=0.9984.0.025μg/mL Pt(Ⅳ)was determined by deposition for 10 min.The method was fairly free from interference and could be applied to the determination of platinum in precious metal ores.The possible mechanism of electrochemical reaction has been proposed by the study of CV, UVand FT-Raman spectrometry and so on.

Key words: Chitosan, Chemically modified electrode, Platinum, Anodic stripping voltammetry

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WANG Yan, YE Xian-Zeng, XU Zhen-Hua, LI Nan-Qiang. Studies on the Determination of Platinum for A Chitosan Chemically Modified Electrode[J]. Chem. J. Chinese Universities, 1996, 17(9): 1367.

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Studies on the Determination of Platinum for A Chitosan Chemically Modified Electrode

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