Fate of the Herbicide Naproanilide in a Rice Paddy Model Ecosystem

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  • WANG Yei-Shung
    Department of Agricultural Chemistry, National Taiwan University
  • HWANG Kuan-Liang
    Department of Agricultural Chemistry, National Taiwan University
  • HSIEH Yar-Ning
    Department of Agricultural Chemistry, National Taiwan University
  • CHEN Yuh-Lin
    Department of Agricultural Chemistry, National Taiwan University

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Other Title
  • 水田モデル生態系における除草剤ナプロアニリドの運命
  • 水田モデル生態系における除草剤ナプロアニリドの運命〔英文〕
  • スイデン モデル セイタイケイ ニ オケル ジョソウザイ ナプロアニリド ノ

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Description

The metabolic fate of naproanilide was studied by using a 14C-labelled compound in a rice paddy model ecosystem in the laboratory. Seven metabolites, 2-(2-naphthoxy)propionic acid, methyl-2-(2-naphthoxy)propionate, 2-naphthol, 2, 3-naphthalenediol, 2, 6-naphthalenediol, 2, 7-naphthalenediol, 2-hydroxy-1, 4-naphthoquinone were identified and two unknown compounds were detected. In a 23-day experiment, 78.1, 7.8 and 1.5% of the total radioactivity were found in the sand, water and biota, respectively. The ecological magnification (EM) values were much smaller and the biodegradability indices (BI) values were much greater than those of persistent chlorinated hydrocarbon insecticides for these biota. Naproanilide seems to be degradable from an evironmental standpoint.

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