除草剤 naproanilide の水中での太陽光による光分解速度

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  • 船越 安信
    Life Science Laboratory, Central Research Institute, Mitsui Toatsu Chemical, Inc.
  • 南保 俊夫
    Life Science Laboratory, Central Research Institute, Mitsui Toatsu Chemical, Inc.
  • 榎本 みどり
    Life Science Laboratory, Central Research Institute, Mitsui Toatsu Chemical, Inc.

書誌事項

タイトル別名
  • Photolysis Rate of the Herbicide Naproanilide Exposed to Sunlight in Water
  • 除草剤naproanilideの水中での太陽光による光分解速度〔英文〕
  • ジョソウザイ naproanilide ノ スイチュウ デ ノ タイヨウコウ

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The photolysis rate (conversion per unit energy) of naproanilide (2-(2-naphthoxy)-propionanilide) in water was related with sunlight energy (below 340nm). This relation was expressed by the following equation under seasonal sunlight conditions in an FRA-greenhouse. P=P′×exp (-K×E′), where P is the concentration of remaining naproanilide, P′ is an initial concentration of naproanilide, K is a photolysis constant and E′ is the energy (cal/cm2) of sunlight (below 340nm). The energy required to photodecompose the 50% of the starting material (PL50; cal/cm2) was expressed by the following equation. PL50=0.693/K. The PL50 value of naproanilide was 10.3mcal/cm2 (below 340nm) and reproducible in the FRA-greenhouse. Since the half-life period of naproanilide by photolysis depends on experimental conditions, such as weather and solar altitude, it would be better to use the PL50 value rather than the half-life period to express the reliable photostability of naproanilide. The photolysis rate of naproanilide was pH-independent in water, and slower in O2-free water than in natural water. Sunlight energy (below 340nm) was measured with a UV radio meter UVR-254 (Tokyo Kagaku Kikai Co., Ltd.) in the FRA-greenhouse at Chigasaki City (139°30′ east, 35°29′ north). These data are useful to estimate the photostability of naproanilide in water under natural sunlight conditions.

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