微分脉冲阳极溶出伏安法测定碘离子

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.

Determination of Iodine Ion by Differential Pulse Anodic Stripping Voltammetry

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.