ClO2+Cl2体系中ClO2和Cl2含量的测定

该文在经典碘量法的基础上 ,提出了一种测定ClO2 Cl2 混合体系中ClO2和Cl2 含量的方法。按通常的碘量法可测定体系的总有效氯 (ClO2 Cl2 ) ;向体系中加入一定量的掩蔽剂二甲亚砜后可有效地掩敝体系中的Cl2 ,进而可测定体系中的ClO2 。两者之差即为体系中Cl2 的含量。该测定方法具有良好的精密度和准确度 ,相对标准偏差低于 0 .1 5 % ,相对误差为 0 .0 5 %。

The Determination of Chlorine and Chlorine Dioxide in ClO2 + Cl2 Mixtures

This paper is a development of the classic method determining the concentration of chlorine dioxide in an aqueous. With the classic iodometric method,this paper can work out the total effective chlorine, the sum of the chlorine and chlorine dioxide in the system. By adding a few drops of dimethyl sulfoxide(DMSO) to mask the chlorine effectively, the concentration of chlorine dioxide was determined by general iodometric method.The masking efficiency of DMSO on chlorine and the effect of the excess DMSO on chlorine dioxide are discussed in detail. The result proves that the method has excellent accuracy and precision.The relative standard deviation is less than 0.15% and relative error is 0.05 %.