迄今,国内已发表的离子色谱法测定碘的文章不多,其检测限为5ppb。本文使用Dionex-2020i型离子色谱仪,AS_5柱、电化学检测器,利用I~-在银电极表面沉淀反应来实现检测。 对施加电位、淋洗液浓度及溶液pH值等作了一些实验,选用最佳条件,使I~-的测定可低达0.25ppb。用标准加入法则可测定 So far, there are not many articles published in China for the determination of iodine by ion chromatography, and the detection limit is 5 ppb. In this paper, Dionex-2020i ion chromatography, AS_5 column, electrochemical detector, the use of I ~ - silver electrode surface precipitation reaction to achieve detection. Some experiments were carried out on the applied potential, the concentration of the eluent and the pH value of the solution, and the optimal conditions were selected so that the determination of I ~ could be as low as 0.25 ppb. Standard addition rules can be determined