塩素処理による水中有機物の化学変化 I  P=S型有機りん系農薬からP=O型の生成

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タイトル別名
  • Chemical Changes of Some Organic Compounds in Chlorinated Water. I. Formation of the P=O Analogs from the P=S Type of Organophosphorous Pesticides

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As fundamental studies on chemical changes of organophosphorus pesticides during chlorination of the water, fate of 11 kinds of P=S type and 2 kinds of P=O type pesitcides in the chlorinated water was examined by thin-layer and gas chromatographic methods. Most of these pesticides examined were found to undergo a chemical change in water containing free chlorine as small as 0.1 ppm. Therefore, at a higher concentration of free chlorine, the P=S compounds were easily oxidized to P=O analogs in the water. However, P=O analogs were not detected from Dimethoate and Ethion in the water, while Dipterex, a P=O compound, underwent dehydrochlorination and rearrangement to form DDVP. Among the P=O derivatives formed from P=S compounds, Malaoxon, Paraoxon, and Diazoxon were comparatively stable in the water but Methyl paraoxon, Sumioxon, and Phosvel-oxon were markedly hydrolyzed and formed phenolic compounds in the water. Oxidation of P=O compounds with free chlorine was hardly influenced by the presence of magnesium, calcium and ferric ions less them 1.0 ppm but suppressed by a ferrous ion.

収録刊行物

  • 衛生化学

    衛生化学 22 (4), 196-205, 1976

    公益社団法人 日本薬学会

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