Nonlinear and kinetic arsenic sorption behavior in soils: multiple reactions approach
In this study the extent of nonlinearity and kinetics of arsenic As(V) adsorption in soils was investigated. Batch kinetic experiments were carried out to determine adsorption of As(V) by three surface soils. Sorption isotherms exhibited strong nonlinearity as well as kinetic behavior where the rate of As(V) retention was initially rapid and followed by slow sorption over time. We evaluated a number of model versions of multireaction (MRM) and second-order (SOM) models for their predictive capability of arsenic adsorption in soils. Both models provided good overall predictions of the fate of arsenic in the soils investigated. Based on the goodness of fit to batch data, irreversible retention of the concurrent type appears to be the dominant mechanism and incorporation of an equilibrium sorbed phase should be avoided. We are not aware of others that provide such predictions of arsenic adsorption over time and wide range concentrations.
Arsenic adsorption modeling
H. M. Selim H. Zhang
School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
875-876
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）