高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (1): 28.

• 论文 • 上一篇    下一篇

微分脉冲阳极溶出伏安法测定碘离子

田媛, 宋文波, 姜艳霞, 刘颖, 陈旭, 许宏鼎   

  1. 吉林大学化学系, 长春 130023
  • 收稿日期:1998-06-24 出版日期:1999-01-24 发布日期:1999-01-24

Determination of Iodine Ion by Differential Pulse Anodic Stripping Voltammetry

TIAN Yuan, SONG Wen-Bo, JIANG Yan-Xia, LIU Ying, CHEN Xu, XU Hong-Ding   

  1. Department of Chemistry, Jilin University, Changchun, 130023
  • Received:1998-06-24 Online:1999-01-24 Published:1999-01-24

摘要: 基于I-能被氧化生成IO3-的特性,以铂球电极为工作电极,研究了微分脉冲阳极溶出伏安法(DPAS)测定碘离子.由于产物IO3-在电极上有吸附,因而在+1.3V电清洗120s.在pH=4的0.1mol/LKH2PO4-K2HPO4缓冲溶液底液中,能检测出5.00×10-7mol/L的I-,在5.00×10-71.50×10-5mol/L范围内I-的浓度与峰电流有良好的线性关系.该方法用于海带、食用碘盐中碘的测定,取得了较好的结果.

关键词: 微分脉冲溶出伏安法, 碘, 海带, 食用碘盐

Abstract: I-may be oxidized to form IO3-.On this basis The determination of iodine ion by dif-ferential pulse anodic st ripping voltammetry(DPAS)on Pt ball work Electrode was investigated. For overcoming The absorption of IO3-, The Electrode was washed by Electrochemical method(at+1.3 V)for 120s.This method can detect 5.00×10-7mol/L I-in 0.1 mol/L KH2PO42K2HPO4buffer solution(pH=4).Agood proportionality between The peak currentof DPAS and iodineion concent ration in The range of 5.00×10-7~1.50×10-5mol/L has been observed. This met hod was successf ully applied to determination of iodine in kelp and edible salt.

Key words: Differential pulse anodic stripping voltammetry, Iodine, Kelp, Edible salt

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