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目的研究五步碘量法测定水中二氧化氯各反应成分含量方法的改进,提高测定结果的准确度。方法通过改变相关步骤反应pH值,改良五步碘量法,测定水中二氧化氯各种反应成分的含量。结果根据在不同pH条件下,碘与二氧化氯水溶液中各成分反应的产物不同,通过调节各步反应体系的pH值,用硫代硫酸钠标准溶液滴定整个反应中转化的等化学计量碘,继而用硫代硫酸钠标准溶液的消耗量来计算二氧化氯水溶液中各成分含量。结论通过适当调节五步碘量法各步反应体系pH值,采用延长吹脱氮气时间,可以提高二氧化氯制剂中各成分含量测定的准确性。
OBJECTIVE To study the method of five-step iodimetry to determine the content of chlorine dioxide in water and to improve the accuracy of the determination results. Methods By changing the pH value of the relevant steps and improving the five-step iodometric method, the content of various chlorine dioxide reactants in water was determined. Results According to the different pH conditions, the reaction of iodine and chlorine dioxide aqueous solution of different products, by adjusting the pH value of the reaction system, with sodium thiosulfate standard solution titration of the entire reaction of the transformation of the other stoichiometric iodine, Then use the consumption of sodium thiosulfate standard solution to calculate the content of each component in the aqueous solution of chlorine dioxide. Conclusion By adjusting the pH value of the reaction system in each step, the accuracy of determining the content of each component in chlorine dioxide can be increased by prolonging the time of nitrogen removal.