title: Kinetic modeling of antimony(III) oxidation and sorption in soils.
abstract: Kinetic batch and saturated column experiments were performed to study the oxidation, adsorption and transport of Sb(III) in two soils with contrasting properties. Kinetic and column experiment results clearly demonstrated the extensive oxidation of Sb(III) in soils, and this can in return influence the adsorption and transport of Sb. Both sorption capacity and kinetic oxidation rate were much higher in calcareous Huanjiang soil than in acid red Yingtan soil. The results indicate that soil serve as a catalyst in promoting oxidation of Sb(III) even under anaerobic conditions. A PHREEQC model with kinetic formulations was developed to simulate the oxidation, sorption and transport of Sb(III) in soils. The model successfully described Sb(III) oxidation and sorption data in kinetic batch experiment. It was less successful in simulating the reactive transport of Sb(III) in soil columns. Additional processes such as colloid facilitated transport need to be quantified and considered in the model.
authors.affiliation: Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, China; University of Chinese Academy of Sciences, Beijing, China.
authors.forename: Yongbing
authors.initials: Y
authors.lastname: Cai
authors.affiliation: School of Environment and Materials Engineering, Yantai University, Yantai, Shandong, China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Mi
authors.affiliation: Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, China. Electronic address: hzhang@yic.ac.cn.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
keywords: Adsorption; Antimony(III); Oxidation; Soil; Transport