<報文>水道水中の発ガン性有機塩素化合物の全国調査

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On the problem of the carcinogenic organic chloridein drinking water, its detection and measurement, its reserches in different areas in Japan, and its origin were reported. The authors discovered chloroform, carbon tetrachloride etc. in water by using GC-MS in 1970 and after that invented the quantitative analitical method using the vacuum evaporation technique. From the reserches in fifty main cities in Japan, it was found that the water of all those cities contained organic chlorides such as chloroform, carbon tetrachloride, dichloromethane, bromodi-chloromethane and trichloroethylene with maximum to 88ppb. Then it was clarified that these organic chlorides in water were generated through the chlorinated process of the water supplly plant. This mechanisum may be surely related to the reaction of chlorine and some unkown organic compounds in the water. To prevent this pollutions the ozone treatment, in place of the chlorine treatment, is considered useful.