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人们虽然很关心饮水中存在着的低剂量致突变物与致癌物,但对其中非挥发性有机质的情况却并不了解。为此,作者进行了研究。结果发现,氯化作用能使饮水中产生非挥发性的致突变物,而以亚硫酸盐处理氯化过的水则大大减少其中致突变物。作者于1978年9～12月期间先后数次取城市污水厂经过石灰软化处理后的水样进行研究。其水源为密西西比河水。所有水样在实验室内均作相同处理,仅在氯化或脱氯步骤有所不同。氯化水样方法有两种,一种是以液氯氯化,另一种是水中加入NH_4OH再加液氯使之
Although people are concerned about the low doses of mutagens and carcinogens present in drinking water, they do not understand the nonvolatile organic matter. To this end, the author conducted a study. The results showed that chlorination can produce non-volatile mutagens in drinking water, while sulfite treatment of chlorinated water greatly reduces the mutagen. During the period from September to December 1978, the author studied several water samples from urban sewage treatment plants after lime softening treatment. Its source is the Mississippi River water. All water samples are processed identically in the laboratory and only differ in the chlorination or dechlorination steps. There are two methods of chlorinated water samples, one is liquid chlorinated, the other is added to the water NH4OH plus liquid chlorine so that