<報文>クロロプレン製造工場の汚染と対策

概要

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From 1970 the research on the effluent and the pollution of a chemical plant were continued at Itolgawa area in Nigata Prefecture. The main components of pollutants were chloroprene and vinyl chloride, which were the main products of the plant. From the first, GC-MS analysis was used to the effluent and SIM method was also used to environmental research of the atmosphere and sea water. As one of the result, it was found that chloroprene in the atmosphere was distributed to 15 km with 200 to 0.1ppb level. Then, in the sea, the effluent contained chloroprene was carried long and narrow as a belt and could not mix to sea water easily. These distrbution map was shown the good correspondence to the complaint about the odor. So that there were mountains, rivers and the sea in small area, the appearance of pollution were very complicated. But, the analytical data have explained that relationship. In this ten years, some equipments were arranged to the treatment of the effluent, of which the cocentration of chloroprene decreased to 1/100 of the original concentration. In future, the more advancements are expected to extingush the pollution of halogenated organics.