title: Complete dechlorination of endosulfan and lindane using Mg0/Pd(+4) bimetallic system.
abstract: A Mg0/Pd(+4) bimetallic system was evaluated to dechlorinate endosulfan and lindane in the aqueous phase. Studies were conducted with endosulfan and lindane separately, with or without acid in a 1:1 (v/v) water:acetone phase. In the absence of any acid, higher degradation of endosulfan and lindane was observed using Mg0/Pd(+4) doses of 10/0.5 and 4/0.1 mg/mL, respectively. Acetone plays an important role in facilitating the dechlorination reaction by increasing the solubilities of pesticides. Dechlorination kinetics for endosulfan and lindane (30 and 50 mg/L [30 and 50 ppm] concentration of each pesticide) were conducted with varying Mg0/Pd(+4) doses, and the time-course profiles were well-fitted into exponential curves. The optimum observed rate constants (k(obs)) for endosulfan and lindane were obtained with Mg0/Pd(+4) doses of 5/0.5 and 4/0.1 mg/mL, respectively. Gas chromatography-mass spectrometry analyses revealed that endosulfan and lindane were dechlorinated completely into their hydrocarbon skeletons-Bicyclo [2,2,1] hepta 2-5 diene and benzene, respectively.
authors.affiliation: Centre for Environmental Science and Engineering, Indian Institute of Technology, Powai, Mumbai, India.
authors.forename: Prakhar
authors.initials: P
authors.lastname: Aginhotri
authors.forename: Amit B
authors.initials: AB
authors.lastname: Mahidrakar
authors.forename: Sumit Kumar
authors.initials: SK
authors.lastname: Gautam
mesh_terms: D002713:Chlorine / Q000737:chemistry*; D004726:Endosulfan / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D001556:Hexachlorocyclohexane / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry*
chemical_list: D010575:Pesticides; D008345:Manganese; D002713:Chlorine; D001556:Hexachlorocyclohexane; D010165:Palladium; D004726:Endosulfan