Showing papers by "Gyanendra Singh published in 1989"
01 Aug 1989-Journal of Environmental Science and Health Part B-pesticides Food Contaminants and Agricultural Wastes
TL;DR: In this paper, the degradation flux of each isomer continued to increase for 60 days after treatment and then decreased, and the β-isomer degradation was the slowest, followed by δ−, β−, α− and γ−isomers.
Abstract: Hexachlorocyclohexane and its α‐, β‐, γ‐, and δ‐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 β‐isomer degradation was the slowest, followed by δ‐, α‐ and γ‐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 β‐isomer was observed in rice grains at harvest from higher treatment, but not the recommended dose.
5 citations