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NONEQUILIBRIUM SORPTION DURING DISPLACEMENT OF HYDROPHOBIC ORGANIC CHEMICALS AND 45CA THROUGH SOIL COLUMNS WITH AQUEOUS AND MIXED SOLVENTS
Citation:
Nkedi-Kizza, P., M. Brusseau, P. Rao, AND A. Hornsby. NONEQUILIBRIUM SORPTION DURING DISPLACEMENT OF HYDROPHOBIC ORGANIC CHEMICALS AND 45CA THROUGH SOIL COLUMNS WITH AQUEOUS AND MIXED SOLVENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/183 (NTIS PB90140906), 1989.
Description:
A series of miscible displacement experiments was conducted to investigate the significance of intraorganic matter diffusion (IOMD) as the rate-limiting step in sorption of organic and inorganic solutes during steady water flow in soil columns. Displacement studies were performed using Eustis surface soil and the same soil treated with hydrogen peroxide to reduce soil organic carbon content from 0.2% to <0.01%. wo herbicides (diuron and atrazine) were also displaced with binary solvent mixtures containing varying fractions of methanol and water (0-50% methanol). icontinuum nonequillbrium sorption model was used to simulate the measured effluent breakthrough curves (BTCs) obtained by simultaneous displacement of a nonadsorbed tracer (tritiated water), an organic solute (herbicide), and a metal cation (45Ca).
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NONEQUILIBRIUM SORPTION DURING DISPLACEMENT OF HYDROPHOBIC ORGANIC CHEMICALS AND 45CA THROUGH SOIL COLUMNS WITH AQUEOUS AND MIXED SOLVENTS