Formation of Prothiofos-oxon by Chlorination of Prothiofos in Tap Water

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  • KOBAYASHI Norihiro
    国立医薬品食品衛生研究所　生活衛生化学部室長・博士（工学）
  • TSUCHIYA Yuko
    国立医薬品食品衛生研究所　生活衛生化学部派遣研究員
  • IKARASHI Yoshiaki
    国立医薬品食品衛生研究所　生活衛生化学部部長・博士（薬学）

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  • 塩素処理による水道水中プロチオホスの分解とプロチオホスオキソンの生成挙動
  • エンソ ショリ ニ ヨル スイドウ スイチュウ プロチオホス ノ ブンカイ ト プロチオホスオキソン ノ セイセイ キョドウ

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Abstract

Generally, organophosphorus compounds form their oxones, which usually have stronger choline esterase inhibiting activity than their “originals” by chlorination in water treatment plant. Prothiofos, which is widely being used as organophosphorus insecticide, was recently added to the list of “the complementary items” in Japanese Waterworks act. For the reason, many of water suppliers are monitoring prothiofos in tap water. However, the formation of prothiofos-oxon by chlorination were not reported. In the present study, we have investigated the decomposition of prothiofos and the formation of prothiofos-oxon by chlorination of tap water. At the residual chlorine concentration 0.5 mg/L or more, decomposition of prothiofos and formation of prothiofos-oxon was observed in the chlorine concentration-dependent manner. Further, prothiofos-oxon formed by chlorination was stable over 72 hours in the residual chlorine level of 1 mg/L. These results showed that prothiofos-oxone was transformed from their originals by chlorination on the water purification process and was considerably steady at the actual residual chlorine level (1 mg/L or less) in tap water. Therefore, it is preferable that water suppliers should monitor prothiofos-oxon, rather than prothiofos in tap water.

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