メトキシフェノンの土壌および作物残留

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  • Residue of Methoxyphenone in Various Soils and Crops

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Residues of 3, 3′-dimethyl-4-methoxybenzophenone and its metabolite 3, 3′-dimethyl-4-hydroxybenzophenone (OH metabolite) in soils and crops were investigated by means of the gaschromatograph with ECD. The OH metabolite was acetylated with acetic anhydride and pyridine for analysis with GC-ECD.<br>In upland soil and submerged soil, the half-lives of methoxyphenone were 23-30 days and 7-10 days, respectively.<br>The formation of OH metabolite reached as much as 1% of applied methoxyphenone in upland soil and 26-55% in submerged soil. Neither methoxyphenone nor OH metabolite were found in rice plant even at a treatment with twice amount of recommended dosage. The residue levels were below the detection limit in various crops except in carrot where 0.042ppm of methoxyphenone was detected.

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