Abstract：
:The predictive accuracy of using the one-dimensional advection-dispersion equation to evaluate the fate and transport of solute in a soil column is usually dependent on the proper determination of chemical retardation factors. Typically, the distribution coefficient (Kd) obtained by fitting the linear sorption isotherm has been extensively used to consider general geochemical reactions on solute transport in a low-concentration range. However, the linear distribution coefficient cannot be adequately utilized to describe the solute fate at a higher concentration level. This study employed the nonlinear equilibrium-controlled sorption parameters to determine the retardation factor used in column leaching experiments. Copper and cadmium transportation in a lateritic silty-clay soil column was examined. Through the explicit finite-difference calculations with a third-order total-variation-diminishing (TVD) numerical solution scheme, all results of the theoretical copper and cadmium breakthrough curves (BTCs) simulated by using the Freundlich nonlinear retardation factors revealed good agreement with the experimental observations.
journal_name
Chemospherejournal_title
Chemosphereauthors
Chang CM,Wang MK,Chang TW,Lin C,Chen YRdoi
10.1016/s0045-6535(00)00176-4subject
Has Abstractpub_date
2001-06-01 00:00:00pages
1133-9issue
8eissn
0045-6535issn
1879-1298pii
S0045-6535(00)00176-4journal_volume
43pub_type
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