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Residence Time Effects on Arsenate Adsorption/Desorption Mechanisms on Goethite

^a Dep. of Geological Sciences, 4044 Derring Hall, Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061-0420
^b Dep. of Plant, Soil, and Entomological Sciences, Univ. of Idaho, Moscow, ID 83844-2339
^c Dep. of Plant and Soil Sciences, Univ. of Delaware, Newark, DE 19717-1303

View larger version (12K): [in a new window]   Fig.1. Schematic illustration of the proposed adsorption mechanisms of arsenate onto goethite

View larger version (10K): [in a new window]   Fig. 2. Arsenate sorption isotherm in triplicate on goethite at pH 6 and 298 K. The ionic strength was 0.1 M in NaNO3, and the solid/solution was 10 g L-1

View larger version (16K): [in a new window]   Fig. 3. Arsenate (2 mM) sorption kinetics on goethite at pH 6. The ionic strength was 0.1 M in NaNO3 and the solid/solution was 10 g L-1

View larger version (13K): [in a new window]   Fig. 4. Arsenate (2 mM) sorption kinetics on goethite at pH 4. The ionic strength was 0.1 M in NaNO3 and the solid/solution was 10 g L-1

View larger version (19K): [in a new window]   Fig. 5. Arsenate desorption kinetics in the presence of phosphate (6 mM) at pH 6. The ionic strength was 0.1 M in NaNO3, and the solid/solution was 10 g L-1

View larger version (14K): [in a new window]   Fig. 6. Arsenate desorption in the presence of phosphate (6 mM) at pH 4. The ionic strength was 0.1 M in NaNO3, and the solid/solution was 10 g L-1

View larger version (29K): [in a new window]   Fig. 7. The k3 weighted normalized functions for samples incubated with arsenate for different lengths of time and the scorodite sample diluted 1% by weight in boron nitride. The solid line represents the experimental data, and the dotted line represents the multishell fit to the data

View larger version (31K): [in a new window]   Fig. 8. Fourier transforms (radial structure functions, RSF) of the normalized functions in Fig. 7 for samples incubated for different lengths of time, and scorodite diluted 1% by weight in boron nitride. The solid line represents the experimental data, and the dotted line represents the multishell fit to the data

View larger version (24K): [in a new window]   Fig. 9. The k3 weighted normalized functions for samples incubated for 1032 h with arsenate and then desorbed for various times in the presence of 6 mM phosphate solution and the scorodite sample diluted 1% by weight in boron nitride. The solid line represents the experimental data, and the dotted line represents the multishell fit of the data

View larger version (23K): [in a new window]   Fig. 10. Fourier transforms (radial structure functions, RSF) of the normalized functions in Fig. 9 for samples adsorbed for 1032 h and desorbed for various times in the presence of 6 mM sodium phosphate solution. The scorodite standard diluted 1% by weight in boron nitride is also shown for comparison. The solid line represents the experimental data, and the dotted line represents the multishell fit to the data