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Ｓｎ（Ⅳ）在Ｈ＿２ＳＯ＿４－ＫＩ－ＶｉｔＣ－Ｖ（Ⅳ）体系中有一灵敏的极谱波，考察了影响极谱波的因素，发现硫酸浓度和温度对测定影响较大，硫酸浓度从０．８ｍｏｌ／Ｌ降至０．１ｍｏｌ／Ｌ方法灵敏度可提高近５０倍。本法对标准和样品６～７次平行测定的变异系数分别为＜５％和＜８％，加标回收率为９７．３％～１０１％。本法适于多数天然水中痕量Ｓｎ（Ⅳ）的测定。
Sn (Ⅳ) has a sensitive polarographic wave in H_2SO_4-KI-VitC-V (Ⅳ) system. The factors affecting the polarographic wave were investigated. It was found that the concentration of sulfuric acid and temperature had a great influence on the determination. / L down to 0.1mol / L method sensitivity can be increased nearly 50 times. The coefficient of variation of this method for parallel determination of standard and sample 6 ~ 7 times were <5% and <8% respectively, and the recoveries were 97.3% ~ 101%. This method is suitable for the determination of trace amounts of Sn (IV) in most natural waters.