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DIVISION S-2-SOIL CHEMISTRY

Nonequilibrium Sorption of Dimethylphthalate—Compatibility of Batch and Column Techniques

^a Federal Institute of Geosciences and Natural Resources, Stilleweg 2, 30655 Hannover, Germany
^b Department of Geoecology, Technical University Carolo-Wilhelmina, Langer Kamp 19 c, 38106 Braunschweig, Germany
^c Department of Civil Engineering, UAE University, Al-Ain, United Arab Emirates
^d Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824

Corresponding author (sven.altfelder{at}bgr.de)

This study reconciles an apparent inconsistency between the dimethylphthalate (DMP) batch and column data reported in the literature. Some researchers found that retardation coefficients obtained by fitting a linear two-stage model to column data were about 50% smaller than those calculated from the distribution coefficient of a 14-d isotherm. In this study, sorption parameters were derived independently by fitting a linear and a nonlinear two-stage model simultaneously to the 3- and 14-d isotherms as well as to a sorption rate study reported by others. With the sorption parameters and the dispersion coefficient obtained from a tritium tracer experiment, the column data were adequately predicted. A major part of the differences in the retardation coefficients observed in other research could be related to experimental difficulties in detecting the tailing of nonequilibrium breakthrough curves.

Abbreviations: DMP, dimethylphthalate • LEA, local equilibrium assumption

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