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KMID : 0903519950380030263
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1995 Volume.38 No. 3 p.263 ~ p.268
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Degradation of [14C] Carbofuran in Soils and Characterization of its Nonextractable Residues
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Abstract
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A study was undertaken to compare degradation patterns of carbofuran in soils between submerged and upland moisture conditions. [3-^(14)C]Carbofuran was treated in each soils at the rate of 1.0 ㎎/㎏ (87.8 kBq ^(14)C/50 g soil) and the time-course analysis for distribution of radioactivity and degradation products were conducted. Differences in the pathway and rate of carbofuran degradation in soils were observed between submerged and upland moisture conditions, major degradation being hydrolysis at 7-C position and oxidation at 3-C position, respectively. Carbofuran showed less persistence in soils of higher moisture contents. A significant portion, 24∼39% of the total radioactivity, resided in soils as nonextractable residues at 60 days after treatment. The nonextractable radioactivity was mainly located in soil organic matter, fulvic acid, humic acid and humin fractions. Gel filtration chromatography confirmed the incorporation of carbofuran and its degradation products into the organic matter.
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