Degradation of the Herbicide Alloxydim-sodium in Soil

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  • 除草剤アロキシジムの土壌における分解
  • 除草剤アロキシジムの土壌における分解〔英文〕
  • ジョソウザイ アロキシジム ノ ドジョウ ニ オケル ブンカイ エイブン

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Abstract

Alloxydim-sodium (ADS), sodium salt of 2-(1-allyloxyaminobutylidene)-5, 5-dimethyl-4-(methoxycarbonyl)cyclohexane-1, 3-dione, 14C-labeled at butylidene-1 and ring-1, 5, respectively, was degraded with a half-life of about 5 days in Oiso soil at 25°C in the dark. The following were identified as degradation compounds by thin-layer cochromatography and mass spectrometry: deallyloxylated compound (I), two isomers of oxo-tetrahydrobenzoxazoles (II and III), deallyloxyaminated compound (VI), demethoxycarbonylated compound (VII) and ring-opened dicarboxylic acid (XX). These compounds further decomposed to 14CO2 for the extent of 20% of applied radioactivity at 28 days. Moreover, the evolution of 14CO2 was much faster in the case of XX incubation. In the sterilized soil, ADS degraded slowly and the oxazoles accumulated up to 43% at 28 days. The half-life of ADS under outdoor winter conditions was about 2 days and major degradation compound was I. The amount of soil-bound materials of ADS reached the maximum around 2 months after treatment, but thereafter decreased gradually.

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