高等学校化学学报

高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (9): 1367.

• 论文 • 上一篇    下一篇

脱乙酰壳多糖化学修饰电极测定铂的研究

王艳, 叶宪曾, 许振华, 李南强   

  1. 北京大学化学与分子工程学院, 北京, 100871
  • 收稿日期:1995-09-14 出版日期:1996-09-24 发布日期:1996-09-24
  • 通讯作者: 叶宪曾
  • 作者简介:王艳,女,河南师范大学访问学者.
  • 基金资助:

    国家自然科学基金;中国科学院长春应用化学研究所电分析化学开放研究实验室基金

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

WANG Yan, YE Xian-Zeng, XU Zhen-Hua, LI Nan-Qiang   

  1. College of Chemical and Molecular Engineering, Peking University, Beijing, 100871
  • Received:1995-09-14 Online:1996-09-24 Published:1996-09-24

PDF (PC)

被引次数

32

摘要： 用脱乙酰壳多糖修饰电极为工作电极,阳极溶出伏安法测定痕量铂。在pH=2～3的KClHCl底液中,-0.3V富集2min,静止15s,以0.2V/s扫速阳极溶出,峰电位在-0.16V(vs.SCE),铂(Ⅳ)离子浓度在0.5～5.0μg/mL范围内与峰高呈线性关系。富集10min后,可检测0.025μg/mL铂(Ⅳ).该法用于贵金属矿样的测定,无需分离,结果满意。用循环伏安法、紫外光谱和拉曼光谱研究了该法的电极过程机理。

关键词: 脱乙酰壳多糖, 化学修饰电极, 铂, 阳极溶出伏安法

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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