双硫腙萃取光度法测定管网水中的余氯  

Diphenyl-thiocarbazone Extraction and Spectrophotometry for Determination of Residual Chlorine in Water Distribution System

作　　者：刘建[1] 侯兴汉[1] 闫英桃[1] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054

出　　处：《中国给水排水》2006年第8期81-83,共3页China Water & Wastewater

摘　　要：建立了采用双硫腙萃取光度法间接测定管网水中余氯的新方法。其原理为：在中性条件下水中的余氯氧化锌粉，生成的锌离子与双硫腙生成1：2的红色配合物，用四氯化碳萃取该配合物．然后于535nm波长处测量吸光度，氯浓度在0．11～3．28mg／L范围内服从比尔定律。该方法的加标回收率为99．7％～100．7％。The diphenyl-thiocarbazone extraction and spectrophotometry were developed for indirect determination of residual chlorine in water distribution system. It was based on the principle that zinc powder was oxidized by residual chlorine in water under neutral condition, and the formed zinc ion was reacted with diphenyl-thiocarbazone into red complex with ratio of 1 ： 2, which was extracted with carbon tetrachloride; and then the absorbance was measured at wavelength of 535 nm. Chlorine concentration followed the Beer＇s law in the range of 0.11 - 3.28 mg/L. The method＇s recovery with standard addition was 99.7% - 100.7%.

关 键 词：余氯 双硫腙 分光光度法 

分 类 号：X832[环境科学与工程—环境工程]