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Adsorption of Arsenate and Arsenite on Ferrihydrite in the Presence and Absence of Dissolved Organic Carbon

^a Dep. of Plant and Soil Sciences, Univ. of Delaware, 152 Townsend Hall, Newark, DE 19717
^b Dep. of Crop and Soil, Environmental Science, 236 Smyth Hall, Virginia Polytech. Inst. & State Univ., Blacksburg, VA 24061
^c Dep. of Plants, Soils, and Biometeorology, College of Agriculture, Utah State Univ., Logan, UT 84322

View larger version (19K): [in a new window]   Fig. 1. Adsorption edges of As(V), As(III), humic acid (peat), Suwannee River fulvic acid, and citric acid on ferrihydrite (Fe5OH8· 4H2O). Ferrihydrite suspension concentration = 1.00 g L-1, As(V) = 1.0 mM, As(III) = 1.0 mM, dissolved organic carbon (DOC) = 1.0 mM C, background electrolyte = 0.01 M NaNO3.

View larger version (19K): [in a new window]   Fig. 2. The As(V) adsorption edges on ferrihydrite (Fe5OH8·4H2O) in the presence and absence of dissolved organic carbon (DOC): humic acid (peat), Suwannee River fulvic acid, and citric acid. Ferrihydrite suspension concentration = 1.00 g L-1, As(V) = 1.0 mM, DOC = 1.0 mM C, background electrolyte = 0.01 M NaNO3.

View larger version (12K): [in a new window]   Fig. 3. Dissolved organic carbon (DOC) adsorption edges on ferrihydrite (Fe5OH8·4H2O) in the presence and absence of As(V): (a) humic acid (peat), (b) Suwannee River fulvic acid, (c) citric acid. Ferrihydrite suspension concentration = 1.00 g L-1, As(V) = 1.0 mM, DOC = 1.0 mM C, background electrolyte = 0.01 M NaNO3.

View larger version (19K): [in a new window]   Fig. 4. The As(III) adsorption edges on ferrihydrite (Fe5OH8·4H2O) in the presence and absence of dissolved organic carbon (DOC): humic acid (peat), Suwannee River fulvic acid, and citric acid. Ferrihydrite suspension concentration = 1.00 g L-1, As(III) = 1.0 mM, DOC = 1.0 mM C, background electrolyte = 0.01 M NaNO3.

View larger version (12K): [in a new window]   Fig. 5. Dissolved organic carbon (DOC) adsorption edges on ferrihydrite (Fe5OH8·4H2O) in the presence and absence of As(III): (a) humic acid (peat), (b) Suwannee River fulvic acid, (c) citric acid. Ferrihydrite suspension concentration = 1.00 g L-1, As(III) = 1.0 mM, DOC = 1.0 mM C, background electrolyte = 0.01 M NaNO3.

View larger version (17K): [in a new window]   Fig. 6. Eluted fractions as a function of applied pore volumes. Dissolved organic carbon (DOC) = 1.0 mM C, As(V) = 1.0 mM, background electrolyte = 0.01 M CaCl2.