浓度直读法快速测定碘盐中的微量碘

The Swift Determination of the Microscale Iodine in Iodo-salt by the Direct-reading Method of Concentration

目的为碘盐中微量碘的测定提供一种直观、快速的测定方法。方法用离子选择性电极浓度直读法测定碘盐中微量的碘。实验对离子强度缓冲调节剂、还原剂的选择及用量,方法回收率、精密度、检出限及干扰进行了探讨,并对实际样品进行了测定。结果方法的加标回收率为95.2%～111.5%,RSD(n=11)为0.9%,检出限为1.10×10-2mg/L。结论方法可靠,结果令人满意。

Objective： It afford a visualized and swift method to the determination of the micro-iodine in iodic-salt. Methods： This article adopted ion-selective electrode-direct reading method to determine the iodine in iodic-salt. The experiment researched the TISAB, reducing agent, the recovery, the precision and the detection limit and the interference of this method, and the samples was determined. Results： The recovery is 95.2%-111.5%, the RSD（ n=11） is 0.9%, the detection limit is 1.10×10^-22mg/L. Conclusions： This method is infallible and the result is satisfying.