title: Reductive dehalogenation of endosulfan by cast iron: Kinetics, pathways and modeling.
abstract: Cast iron has been a material of choice for in-situ remediation of groundwater. In this study interaction of endosulfan with High Carbon Iron Filings (HCIF) was studied in batch reactors. Decline in total concentration (Ct) could be related to aqueous concentration (Ca) by equation dCt/dt = k1.M.Ca(n), where reaction rate constant (k1) and order (n) were found to be 1.246 × 10(-4) L g(-1) iron h(-1) and 1.47, respectively. Partitioning of endosulfan to HCIF could be explained by Freundlich isotherm. The process of simultaneous reductive dehalogenation and adsorption/desorption was successfully modelled. The reductive dehalogenation of endosulfan resulted in by-products identified as [(3a, alpha,7beta,7a alpha,8s)-4,5,6,7,8 Pentachloro 3a,4,7,7a-tetrahydro] (C9H3Cl5O3) and Benzofuran,4,5,7-trichloro-2,3-dihydro-2-methyl (C9H7Cl3O).
authors.affiliation: Department of Environmental Science and Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India.
authors.forename: Yangdup
authors.initials: Y
authors.lastname: Lama
authors.affiliation: Department of Environmental Science and Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India. Electronic address: aloksinha11@yahoo.com.
authors.forename: Alok
authors.initials: A
authors.lastname: Sinha
authors.affiliation: Department of Environmental Science and Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India.
authors.forename: Gurdeep
authors.initials: G
authors.lastname: Singh
authors.affiliation: Environmental Management Division, Central Institute of Mining and Fuel Research (Digwadih Campus), PO: FRI, Dhanbad, Jharkhand 828108, India.
authors.forename: Reginald E
authors.initials: RE
authors.lastname: Masto
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D004726:Endosulfan / Q000737:chemistry*; D060587:Groundwater / Q000737:chemistry; D054879:Halogenation; D007306:Insecticides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D007306:Insecticides; D014874:Water Pollutants, Chemical; D002244:Carbon; D007501:Iron; D004726:Endosulfan
keywords: Endosulfan; High Carbon Iron Filings (HCIF); Modeling; Pathways; Reductive dehalogenation