Sorption and transport of cadmium, nickel, strontium, and calcium in soil
- Univ. of Arizona, Tucson, AZ (United States)
The sorption and transport of Cd, Ni, and Sr in a subsurface soil were investigated by using both batch and miscible-displacement experiments. The adsorption isotherms of Cd, Ni and Sr are strongly nonlinear and well described by the Freundlich equation (S=K{sub f}C{sup n}). Electrostatic adsorption is the major contributor to sorption of Cd, Ni and Sr. The sorption affinities of Cd and Ni are similar. The breakthrough curves were analyzed by use of models accounting for various combinations of instantaneous, rated limited, linear, and nonlinear sorption. The analysis revealed that nonlinear sorption was the major cause of nonideal transport, with rate-limited sorption, a relatively minor component. The transport of Cd, Ni, and Sr can be dramatically enhanced in the presence of Ca due to competition between Ca and these metals for surface exchange sites.
- OSTI ID:
- 126320
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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