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PHREEQC, a geochemical transport model, is used to simulate diffusive transport of Pb through a 10-cm-thick clay liner. The results are compared to those of Roehl and Czurda [Applied Clay Science 12 (1998) 387] who studied Pb migration by diffusion in a carefully monitored laboratory experiment. The computer simulation accounts for effects due to adsorption by ion exchange, changes in CEC, variable...
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