[논문]Adsorption–desorption, persistence and leaching behavior of thifluzamide in alluvial soil

doi:10.1016/j.chemosphere.2004.06.033

Adsorption–desorption, persistence and leaching behavior of thifluzamide in alluvial soil

Chemosphere, v.57 no.6, 2004년, pp.471 - 480

Gupta, Suman (Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi 110 012, India) , Gajbhiye, Vijay T. (Corresponding author. Fax: +91 11 25843272)

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AbstractInvestigations were undertaken to study the adsorption–desorption, persistence and leaching of thifluzamide (2′,6′-dibromo-2-methyl-4′-trifluoromethoxy-4-trifluoro methyl-1,3-thiazole-5-carboxanilide) in an alluvial soil under laboratory conditions. The adsorption–desorption studies were carried out using batch equilibration technique. The results revealed high but weak adsorption of thifluzamide in alluvial soil with KF value of 9.62 and ‘n’ value of 0.63. About 47–62% of the adsorbed amount got desorbed in four desorption cycles, which further substantiate the hypothesis of weak binding. The hysteresis coefficient varied from 0.19 to 0.40. Persistence studies carried out at three concentration levels (0.1, 1.0 and 10.0 μgg−1) and under three moisture conditions (air-dry, field capacity moisture and submerged) revealed that thifluzamide is a persistent chemical and only 19.5–54.0% dissipation was recorded on 90th day. However, it appears that aerobic microbes are more efficient in degrading thifluzamide than anaerobic microbes. The preliminary leaching studies carried out in the laboratory revealed that thifluzamide was moderately mobile in alluvial soil. Only small amounts (<1%) were recovered from leachate fractions whereas major portion remained in 0–15 cm soil depth.

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Adsorption–desorption, persistence and leaching behavior of thifluzamide in alluvial soil

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