对于含有[HgI_4]~(2-Ⅰ-、Ⅰ_2)的混合溶液,可以用硫化物除Hg后测定碘。但过量硫离子的干扰要设法消除,致使操作复杂。本试验参照有关资料 以锌粉置换除汞后,用碘离子选择电极直接测碘。方法简单快速,重现性好,不受Cl~-影响,尤其对低含量碘的测定,结果符合分析误差要求。回收率98～102％,标准偏差0.69％,相对标准偏 For mixtures containing [HgI_4] ~ (2-I-, I_2), iodine can be determined by removing Hg from sulfide. However, the interference of excessive sulfur ions should be managed to eliminate, resulting in complicated operation. The test with reference to the relevant information to remove mercury after the replacement of zinc, iodide ion selective electrode with direct measurement of iodine. The method is simple and rapid, reproducible, and not affected by Cl ~ -, especially for the determination of low levels of iodine, the results meet the analytical error requirements. Recovery rate of 98 ~ 102%, standard deviation of 0.69%, relative standard deviation