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Published online 5 April 2007
Published in Soil Sci Soc Am J 71:674-681 (2007)
DOI: 10.2136/sssaj2006.0299
© 2007 Soil Science Society of America
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Modeling Cadmium Transport in Soils Using Sequential Extraction, Batch, and Miscible Displacement Experiments

Daniel C. W. Tsang*, Weihua Zhang and Irene M. C. Lo

Department of Civil Engineering, The Hong Kong Univ. of Science and Technology, Hong Kong, China


Figure 1
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  		Fig. 1. Sorption kinetics of Cd of soils from The Hong Kong University of Science and Technology (UST), Tai Mo Shan (TMS), and Clearwater Bay (CWB) at: (a) 10–5 M; (b) 10–3 M. The pH was 5.0 ± 0.2. Each point is the average of triplicates. Error bars are standard deviations that are often smaller than the symbols.

 

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  		Fig. 2. Sorption isotherms of Cd (log scale) of soils from The Hong Kong University of Science and Technology (UST), Tai Mo Shan (TMS), and Clearwater Bay (CWB). The pH values ranged between 4.7 and 5.0. Each point is the average of triplicates and error bars represent the standard deviation (often smaller than the symbols). Freundlich isotherms yielded r2 > 0.98.

 

Figure 3
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  		Fig. 3. Experimental data and optimized simulations for Cd transport in soil from The Hong Kong University of Science and Technology at four input concentrations: (a) 10–5 M; (b) 5 x 10–5 M; (c) 10–4 M; and (d) 10–3 M.

 

Figure 4
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  		Fig. 4. Experimental data and optimized simulations for Cd transport in Tai Mo Shan soil at input concentrations of (a) 10–5 M and (b) 10–3 M, and in Clearwater Bay soil at (c) 10–5 M and (d) 10–3 M.

 




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