摘要
为了满足用稳定性二氧化氯消毒饮用水的小型水厂快速检测余氯的需要,作者对邻联甲苯胺与ClO2和Cl2显色反应的原理进行了分析,结果表明,在相同条件下,余氯量相同的Cl2与邻联甲苯胺显色反应产生的颜色深度是ClO2的5倍。根据这一结果,用pH6.5的Na2HPO4-KH2PO4缓冲溶液将传统测定余氯的比色法中的K2CrO4-K2Cr2O7模仿标准色阶稀释5倍,同时增大显色液层厚度,以提高检测灵敏度,使之能直接用于稳定性二氧化氯消毒处理后的饮用水中余氯的检测。经碘量法验证,该方法简便、快速、灵敏、准确。
In order to meet the requirements of rapid determination of residual chlorine in drinking water in small water plants that uses the stable chlorine dioxide to disinfect drinking water,the principle of color reaction of omethyl benzidine with chlorine dioxide and chlorine is discussed. The result shows that under the same detecting conditions,the color darkness of the color reaction resulted from the same amount of residual chlorine with omethyl benzidine is 5 times of the color reaction resulted from chlorine dioxide with o-methyl benzidine.According to this result, the imitational standard color rank of K2CrO4- K2Cr2O7 used in traditional method of the detecting residual chlorine of colorimetric determination will be diluted 5 times by using the buffer solution of Na2HPO4-KH2PO4（pH=6-5）. And, the thickness of the color layer will be increased so as to enhance the sensitiveness of determination,making this method be directly used for detecting residual chlorine in the drinking water with stable chlorine dioxide after disinfected. This method was verified by iodimetry,and the result shows that it is simple,fast,sensitive and accurate.
出处
《工业水处理》
CAS
CSCD
北大核心
2007年第3期67-70,共4页
Industrial Water Treatment
关键词
二氧化氯
比色分析
饮用水
chlorine dioxide
colorimetric analysis
drinking water
