The method of iodometric determination of chlorates impurities in sodium hypochlorite solutions for medical and veterinary purposes was developed. This method does not require sophisticated equipment and can be implemented directly where the solutions are used. The method is based on the different rates of interaction of ClO^- and with iodide ions depending on the acidity of the medium. We have shown that blank titration is advisable to improve the accuracy of the determination of low concentrations of chlorates in the matrix of hypochlorite which is present in excess since in this case possible systematic errors due to the presence of oxidizing impurities in the reagents are prevented. To quantify the low concentrations of chlorates, we proposed to remove 85-95% of hypochlorite ions by means of reducing their excess with sodium sulfite at pH 10.5. The solution of sodium sulfite does not require standardization before each analysis in the proposed procedure. The possibility of quantitative determination of chlorate impurities in the range of 2-50 mg/L in the presence of 50-500–fold excess of sodium hypochlorite with an error of 5% has been proved. The expanded uncertainty of chlorate determination did not exceed 0.6 mg/L.

中文翻译：

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电位滴定法测定次氯酸盐溶液中的氯酸盐杂质。

建立了碘量法测定医用和兽用次氯酸钠溶液中氯酸盐杂质的方法。该方法不需要复杂的设备，可以在使用解决方案的地方直接实现。该方法是基于CLO的相互作用的不同速率^-和碘离子取决于介质的酸度。我们已经表明，建议进行空白滴定以提高次氯酸盐基质中低浓度氯酸盐的测定精度，该次氯酸盐基质过量存在，因为在这种情况下，可以防止由于试剂中存在氧化性杂质而可能导致系统误差。为了量化低浓度的氯酸盐，我们建议通过在pH 10.5的亚硫酸钠中减少过量的次氯酸盐离子来去除85-95％的次氯酸盐离子。在拟议程序中的每次分析之前，亚硫酸钠溶液无需标准化。事实证明，在次氯酸钠过量50-500倍（误差为5％）的情况下，定量测定2-50 mg / L范围内氯酸盐杂质的可能性。