碘离子选择电极快速测定食盐中碘的含量  

Determination of iodine in table salt by iodide ion selective electrode

作　　者：李玉成 姚静 

机构地区：[1]锡盟民族技工学校,锡林浩特026000 [2]内蒙古环境科学研究院,呼和浩特010010

出　　处：《环境与发展》2011年第12期157-160,共4页Environment & Development

摘　　要：利用碘离子选择电极,以0.1 mol/L KNO3-0.01 mol/L酒石酸为总离子强度调节剂、Na2SO3为还原保护剂,将加碘食盐中的IO3-还原为I-,在双液接饱和甘汞电极为参比电极的条件下,采用直接电位法和标准曲线法直接测定了溶液中的碘含量,实验结果表明,本方法线性范围10-1～10-7mol/L,检测下限4.6×10-8mol/L,样品具有较好的回收率(98.2%-100.7%),可以用此方法测定食盐中I-的含量。This paper describes a rapid iodine content measure method by using the iodide ion selective electrode under a reducing buffer environment. With Na2SO3 as reducing agent and the buffer solution of 0.1 mol/L KNO^（3-）0.01moL/L tartaric acid, IO^（3-）is reduced to I^-. The iodide ion could be detected by the selective electrode with potentiometry. Then the detection result is compared with standard curved to determine the salt iodine content. The linear measurement interval is 10^（-1）～ 10^（-7） mol/L with the minimum detects concentration of 4.6 × 10^（-8）mol/L. The recovery coefficient is 98.2% - 100.7%.

关 键 词：碘离子选择电极 快速测定 食盐 

分 类 号：X836[环境科学与工程—环境工程]