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。