Li C, Luo Y, Zhang K, Zhao R
Hua Xi Yi Ke Da Xue Xue Bao. 1994 Dec;25(4):460-2.
Sn(IV) has a sensitive polarographic wave in the system of H2SO4-KI-VitC-V (IV). We examined the factors influencing the polarographic wave and found that the concentration of sulfuric acid and temperature were critical factors for the determination. The sensitivity of the method was increased nearly 50-fold by decreasing the concentration of sulfuric acid from 0.8 mol/L to 0.1 mol/L. The coefficient of variation (CV) percentages of the method were less than 5% and 8% for 6-7 determinations of Sn (IV) standard and sample respectively. The recovery ranged from 97.3% to 101%. The proposed method is suitable for direct determination of trace Sn (IV) in most natural water samples.
在硫酸-碘化钾-维生素C-钒（IV）体系中，锡（IV）有一个灵敏的极谱波。我们研究了影响该极谱波的因素，发现硫酸浓度和温度是测定的关键因素。通过将硫酸浓度从0.8mol/L降至0.1mol/L，该方法的灵敏度提高了近50倍。该方法对锡（IV）标准溶液进行6-7次测定的变异系数（CV）百分比小于5%，对样品进行6-7次测定的变异系数（CV）百分比小于8%。回收率在97.3%至101%之间。该方法适用于直接测定大多数天然水样中的痕量锡（IV）。
