...的分布及其分布规律,同时研究消毒副产物随季节变化及地带性分布规律.方法 选取大庆、北京、天津、郑州、长沙和深圳6个城市,对其市政供水中水源、水处理等供水情况进行调查,同时对饮用水中主要消毒副产物三卤甲烷(THMs)及卤乙酸(HAAs)指标,以及天然有机物、pH、投氯量和水温进行监测.
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Image credit: flickr user THMS.
图片来源：flickr用户thms。
Analysis revealed that after a 48-hour period these treatments reduced THMs by respectively 30%, 87%, and 92%.
分析结果显示：经过不同的处理，48小时后三卤甲烷分别下降：30%，87%，和92%。
Trihalomethanes (THMs), which were found to be possible human carcinogens, are formed as the main disinfection by-products during the chlorination process of water treatment.
具有致癌、致突变作用的三卤甲烷是饮用水氯化消毒的主要副产物。
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