酸化的および還元的土壌条件下の湛水土壌中におけるジフェニルエーテル系除草剤CNPの分解

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  • 小山田 正美
    Department of Agricultural Chemistry, Nagoya University (Present Address) Agricultural Research Laboratory, Mitsui Toatsu Chemicals Inc.
  • 鍬塚 昭三
    Department of Agricultural Chemistry, Nagoya University

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タイトル別名
  • Degradation of CNP, a Diphenyl Ether Herbicide, in Flooded Soil under Oxidative and Reductive Conditions

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Degradation of CNP, 2, 4, 6-trichlorophenyl 4′-nitrophenyl ether, in a flooded soil under oxidative (aerobic) and reductive (anaerobic) conditions was studied in the laboratory using 14C-CNP labelled at each of the benzene rings. The degradation rate of CNP differed depending upon the redox potential of the soil. The half-life period was 6 to 7 days under oxidative conditions and 1 to 2 days under reductive conditions. Degradation of CNP under oxidative conditions started after a short lag-period. The degradation products were identified as 2, 4, 6-trichlorophenyl 4′-aminophenyl ether, 2, 4, 6-trichlorophenyl 4′-acetylaminophenyl ether, 2, 4, 6-trichlorophenyl 4′-hydroxyphenyl ether, 2, 4, 6-trichlorophenol, p-nitrophenol, and p-aminophenol by tlc. Major products were the acylamino derivatives which under reductive conditions reached about 15.5% of applied radioactivity after 2 days and then decreased thereafter. The other products were detected only in small amounts. Most of the radioactivity was strongly adsorbed to the soil within a few days and was unextractable with organic solvents. This was attributed to complex formation between the amino derivative and soil constituents. More 14CO2 was liberated under oxidative, than reductive, flooded conditions.

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