タイル工場より発生するフッ素による煙害について II

概要

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A smoke injury occurred in Gifu prefecture in May, 1964,by which fruit-trees, mulberry leaves and silkworms near a tile factory were injured. From the results of researches, it was found that the fluorine content in green body and glaze used in the factory were comparatively high, and fluorine in these raw materials was volatilized by firing in the course of tile manufacturing so that it injured them. So, it was recommended as a counter-step for the factory that the materials containing larger amount of fluorine should be changed into those of lower fluorine content and the stacks of the factory should be made 2 times higher. Thus, a clay containing 40 mg of fluorine per 100 g was changed into another clay containing 3 mg of fluorine per 100 g, a glaze was changed into one with lower fluorine content and the stacks were lengthened from 8 m to 21 m high, too. Therefore, in 1965,the fluorine content in flue gas were below 1/2,the amount of fluorine in the air near the factory measured by alkaline filter paper method diminished to 1/2〜1/6 and that in mulberry leaves decreased very remarkably. In this area, although a partial injury occurred in late antumn, the yields of cocoon in spring and early autumn in 1965 were very good, and it could generally be said that the smoke injury had remarkably decreased in this area.
公益社団法人日本薬学会の論文
1966-12-30