title: Competitive sorption and transport of Pb2+, Ni2+, Mn2+, and Zn2+ in lateritic soil columns.
abstract: Knowledge of sorption and transport of heavy metals in soils in the presence of other metals is crucial for assessing the environmental risk of these metals. Competitive sorption and transport of four metals, Pb(2+), Ni(2+), Zn(2+), and Mn(2+), were investigated using multi-metal column experiments with lateritic soils obtained from a gold mine impacted by acid mine drainage. Based on Pb(2+) breakthrough time for single-metal system at a pH of approximately 5, the sorption capacity of Pb(2+) was estimated to be higher in lateritic soil than the other metals. For multi-metal systems, the estimated retardation factors for the metals from highest to lowest were: Pb(2+)>Zn(2+)∼ Ni(2+)>Mn(2+), suggesting the mobility of metals through lateritic soil for a multi-metal system would be in the order of Mn(2+)>Ni(2+)∼ Zn(2+)>Pb(2+). For binary and multi-metal systems, the estimated sorption capacities of individual metals were found to be lower than the sorption capacities in single metal system - indicating possible competition for sorption sites. Mass recoveries estimates showed that the sorption of metals was more reversible under competitive multi-metal systems than in single metal systems.
authors.affiliation: National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM), Chulalongkorn University, Bangkok 10330, Thailand. lertc77@yahoo.com
authors.forename: Srilert
authors.initials: S
authors.lastname: Chotpantarat
authors.forename: Say Kee
authors.initials: SK
authors.lastname: Ong
authors.forename: Chakkaphan
authors.initials: C
authors.lastname: Sutthirat
authors.forename: Khemarath
authors.initials: K
authors.lastname: Osathaphan
mesh_terms: D000327:Adsorption; D004784:Environmental Monitoring / Q000379:methods*; D007854:Lead / Q000032:analysis; D008345:Manganese / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D008906:Mining; D009532:Nickel / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D015032:Zinc / Q000032:analysis
chemical_list: D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D007854:Lead; D008345:Manganese; D009532:Nickel; D015032:Zinc