离子选择性电极测定碘盐中碘含量及碘损失研究

Research on iodine losses and determination of iodine content in iodated salt by ion-selective electrode

实验采用碘离子选择性电极技术和标准曲线方法,在碘盐溶液中加入抗坏血酸将碘盐中的碘转化为I-后直接测定了内蒙古盐业公司呼和浩特市分公司生厂的碘盐中的碘含量,测定结果显示碘含量为29.85mg/kg,已达国家标准。同时还研究了温度对碘盐中碘含量的影响,结果显示:95～345℃范围内,食盐中碘含量保持在23.49mg/kg,385～700℃范围内,食盐中碘含量在14.27～4.956mg/kg范围,由此可见温度对碘含量的影响较大。

A new method for determining the content of iodine in iodated salt using calibration curve method by means of ion-selective electrode technique was studied, based on the fact that iodine in iodated salt was reduced to I- by ascorbic acid. The experiment determined the content of iodine in iodated salt which was produced in Hohhot of Inner Mongolia, and the result showed that the content of iodine reached to about 29.85 mg/kg, which reaches to the national standard. At the same time, the experiment also researched the impact of temperature on the content of iodine in iodated salt. Among the range of 95～345 ℃, the content of iodine in iodated salt remained at 23.49mg/kg, but in the range of 385～700 ℃, the content of iodine in the iodated salt remained in the range of 14.27～4.956 mg/kg, therefore, we knew that the temperature largely affected the content of iodine in iodated salt.