期刊
GEODERMA
卷 189, 期 -, 页码 278-287出版社
ELSEVIER
DOI: 10.1016/j.geoderma.2012.06.032
关键词
Chemical nonequilibrium two-site model; Heavy metals; HYDRUS-1D; Lateritic soil; Sorption
类别
资金
- Thailand Research Fund [MRG 5480118]
- Asahi Glass Foundation (AGF) Japan
- Thailand Toray Science Foundation (TTSF)
- Geology Department of Chulalongkorn University
Transport of heavy metals from acid mine drainage through soils can impact valuable water resources and have a deleterious effect on their associated ecosystems. The movement of single, binary and multi-metal systems through lateritic soil columns were experimentally determined and then modeled with the HYDRUS-1D using a local equilibrium convection-dispersion (CD,) model, or chemical nonequilibrium two-site model (TSM) with first order kinetics. The TSM model described the breakthrough curves better than the CDeq model in both binary and multi-metal systems. The (Q(max))/(Q(max)*) ratios were generally greater than unity suggesting that the presence of other metals reduced sorption through competition for sorption sites. Ratios of (Q(max))(Pb)(2+)/(Q(max))(secondary metals) ((Mn2+,) (Zn2+, Ni2+)) (ranging from 0.92 to 1.09) were lower than ratios of (Q(max)*)(Pb)(2+)/(Q(max)*)(secondary metals) ((Mn2+,) (Zn2+, Ni2+)) (ranging from 0.94 to 2.80), which indicated the highest sorption affinity of Pb2+ was under both binary and multi-metal systems. Furthermore, the fraction of the instantaneous equilibrium site (f) of all metals, particularly for secondary metals, tended to increase with increasing metal concentrations in the system, suggesting that diffusion probably dominates the sorption and transport of heavy metals in the system. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据