<報文>相模川および多摩川水系における揮発性有機物汚染の把握

概要

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In the former paper, some halogenated organics were found to generate in the chlorination process of the water suppiy. But the small amounts of these compounds were already contained in the river water before chlorination. To trace the origin of these, the river Sagami and Tama were investigated from the source to the outfall of the both rivers. In all samples, some organics, such as benzene, toluene, acetone, chloroform, 1,1,1-trichloroethane and trichloroethylene, were determined to a level of 0.1 to 100 ppb. By means of diagrams, the following facts were considered : aromatic compounds were partially relating to the air pollution ; chlorinated solvents were flowed into the rivers as pollutants ; acetone and chloroform were, besides of the case evidently affected by factories, unable to explain with the origin. This question is expected to examine at next chance.