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Dissipation behavior of hexachlorocyclohexane isomers in flooded rice soil



Dissipation behavior of hexachlorocyclohexane isomers in flooded rice soil



Journal of Environmental Science & Health Part B Pesticides Food Contaminants & Agricultural Wastes 24(4): 335-348



Hexachlorocyclohexane and its .alpha.-, .beta.-, .gamma.-, and .delta.-HCH isomer's dissipation behavior in flooded soil under the cover of rice crop was studied with the recommended (2.5 kg a.i./ha) and double the recommended doses. The degradation flux of each isomer continued to increase for 60 days after treatment and then decreased. Among the different isomers, the .beta.-isomer degradation was the slowest, followed by .delta.-, .alpha.- and .gamma.-isomers. Several reasons are suggested for this degradation behavior of different HCH isomers. Partition distribution coefficients (Kd) of all isomers showed a positive correlation with incubation time and their respective degradation rates. This study was compared with non-flooded plots where all the isomers persisted for a longer period. Measurable translocation and accumulation of .beta.-isomer was observed in rice grains at harvest from higher treatment, but not the recommended dose.

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Accession: 007218056

Download citation: RISBibTeXText

DOI: 10.1080/03601238909372653



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