【摘要】 为掌握国标间接检测法测定三氯乙醛(CH)的准确度,文中分析国标法与EPA法测定CH的差异,比较其他消毒副产物在碱、中性条件下转化、常用添加剂高温碱性处理、不同CH与三氯甲烷(TCM)浓度比下减差这3个方面对CH浓度测定的影响,并对水厂和管网实际水样、加标水样及统一生成条件下的浓度进行分析。结果表明,造成2种检测方法CH浓度差异的原因主要是水体中的1,1,1-三氯丙酮和三氯乙酸。多数情况下,国标法检测相对偏差<15%,在可接受范围内。更多还原

【Abstract】 The difference between national standard and EPA method was investigated to understand the accuracy of national standard for indirect detection of chloral hydrate(CH) in drinking water. Factors which could affect the detection method of CH in drinking water were clarified. Several influences including transformation of other disinfection byproducts under alkaline and neutral conditions, treatment of additive agent with high temperature, and concentration ratios of CH and chloroform(TCM) were also studied. The concentration of CH in water samples collected from water treatment plant and pipe network, spiked water samples and water samples with uniform formation condition were measured, respectively. Results showed that difference of CH concentrations between the two methods was caused by effects of trichloroacetone and trichloroacetic acid. The relative standard deviations(RSDs) of national standard detection method were less than 15% in most test cases, which could be accepted.更多还原