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Sorption and Transport of Iron-Cyanide Complexes in Goethite-coated Sand

^a Arbeitsgruppe Bodenkunde und Bodenökologie, Fakultät für Geowissenschaften, Ruhr-Universität Bochum, D-44780 Bochum, Germany
^b Lehrstuhl für Bodenkunde, TU München, D-85350 Freising-Weihenstephan, Germany

View larger version (24K): [in a new window]   Fig. 1. Breakthrough curves of Cl- in goethite-coated sand at three pore-water velocities. Breakthrough curves are numbered according to Table 1. Symbols indicate measured data, the lines result from fitting the data to Eq. [2] using CXTFIT.

View larger version (22K): [in a new window]   Fig. 2. Breakthrough curves of ferricyanide in goethite-coated sand at three pore-water velocities (a, = 0.104 cm min-1; b, = 0.215 cm min-1; c, = 0.305 cm min-1). Lines result from simulations using batch-derived Langmuir isotherm parameters (Eq. [6], smax = 1.67 x 10-3 g g-1, KL = 176862 g-1 cm3) with four different forward rate parameters kf using CARRY. Arrows indicate the beginning of a flow interruption.

View larger version (21K): [in a new window]   Fig. 3. Breakthrough curves of ferrocyanide in goethite-coated sand at three pore-water velocities (a, = 0.104 cm min-1; b, = 0.209 cm min-1; c, = 0.305 cm min-1). Lines result from simulations using batch-derived Langmuir isotherm parameters (Eq. [6], smax = 2.79 x 10-3 g g-1, KL = 384326 g-1 cm3) with four different forward rate parameters kf using CARRY. Arrows indicate the beginning of a flow interruption.

View larger version (13K): [in a new window]   Fig. 4. Breakthrough curves of ferrocyanide in goethite-coated sand at three pore-water velocities (a, = 0.104 cm min-1; b, = 0.209 cm min-1; c, = 0.305 cm min-1). Lines result from fitting the data to the Langmuir isotherm (Eq. [6]) using MCMFIT. Fitted parameters are given in Table 3.