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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

View larger version (20K): [in a new window]   Fig. 1. Measured and simulated batch data for dimethylphthalate (DMP) on Oakville A and B soils. Simulations were carried out with the linear and nonlinear two-stage model

View larger version (17K): [in a new window]   Fig. 2. Measured and simulated breakthrough curves of dimethylphthalate (DMP) column experiments with Oakville A soil. The simulated breakthrough curves were estimated using the parameter set given in Table 1. The local equilibrium assumption (LEA) breakthrough curves were calculated with the 14-d distribution coefficient given by Maraqa et al. (1998). The letters in each figure denote first moments E[T] calculated from the measured curve (a), fitting CXTFIT to measured data (b), the 14-d distribution coefficient (c) (all given by Maraqa et al., 1998), and the parameters of the linear two-stage model estimated from the batch data (d) (this work)

View larger version (17K): [in a new window]   Fig. 3. Measured and simulated breakthrough curves of dimethylphthalate (DMP) column experiments with Oakville B soil. For further information see caption of Fig. 2

View larger version (22K): [in a new window]   Fig. 4. Simulated dimethylphthalate (DMP) breakthrough curves at six different flow velocities using linear sorption rate parameters estimated for Oakville B soil. The quantification limit used to calculate recovery in Table 3 is also shown. The experimental conditions chosen for the three highest flow velocities are the same as those of the Exp. B1, B2, and B3 (figure modified after Selim et al., 1976)

View larger version (22K): [in a new window]   Fig. 5. The product of the Damköhler number and the percentage fraction of variance due to kinetic sorption as a function of pulse length T0 and Peclet number P. Numbers on curves indicate values of (1 - ß)2P

View larger version (24K): [in a new window]   Fig. 6. Simulated breakthrough curves calculated for three sets of linear sorption rate parameters at two pore water velocities. Solid lines represent curves at a pore water velocity of 36.47 cm h-1, while the dotted lines represent curves at 0.00073 cm h-1. The second set of parameters is identical to that given for dimethylphthalate (DMP) sorption to Oakville B soil in Table 1. The first and last set of parameters were obtained by varying f, while keeping the product fkD constant