title: Sorption kinetics of arsenic on laterite soil in aqueous medium.
abstract: The efficiency of a locally available laterite soil in removing both arsenite and arsenate from aqueous medium by adsorption was evaluated. It was observed that in batch experiment conducted at 0.5 mg/L initial concentration of arsenic, laterite soil could remove up to 98% of arsenite and 95% of arsenate under optimized conditions. The kinetic profiles under various conditions were developed. Both arsenite and arsenate removal followed pseudo--second order reaction kinetic model. Pore and film diffusion coefficients were determined from the half-time equation and film diffusion appeared to be the rate-limiting. This was further supported by multiple interruption tests.
authors.affiliation: Civil Engineering Department, Indian Institute of Technology, Kharagpur, India.
authors.forename: Sanjoy K
authors.initials: SK
authors.lastname: Maji
authors.forename: Anjali
authors.initials: A
authors.lastname: Pal
authors.forename: Tarasankar
authors.initials: T
authors.lastname: Pal
authors.forename: Asok
authors.initials: A
authors.lastname: Adak
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D004050:Ditiocarb; D007700:Kinetics; D008962:Models, Theoretical; D012987:Soil / Q000032:analysis*; D014867:Water / Q000737:chemistry*
chemical_list: D012987:Soil; D014867:Water; C001924:silver diethyldithiocarbamate; D004050:Ditiocarb; D001151:Arsenic