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Sorption of Iron–Cyanide Complexes on Goethite in the Presence of Sulfate and Desorption with Phosphate and Chloride

Arbeitsgruppe Bodenkunde und Bodenökologie, Fakultät für Geowissenschaften, Ruhr-Universität Bochum, D-44780 Bochum, Germany

View larger version (9K): [in a new window]   Fig. 1. Sorption of iron–cyanide complexes on goethite in the presence and absence of equimolar amounts of sulfate and sorption of sulfate in the presence of iron–cyanide complexes as influenced by pH (a, ferricyanide; b, ferrocyanide). Initial concentration of each anion was 0.3 mmol L-1.

View larger version (12K): [in a new window]   Fig. 2. Sorption of iron–cyanide complexes and sulfate on goethite at variable iron–cyanide complex and constant sulfate concentrations at pH 3.5 (a, ferricyanide; b, ferrocyanide). Experimental conditions: ci ([Fe(CN)6]) = 0.025 to 0.48 mmol L-1; ci = 0.23 mmol L-1; I = 0.01 M. Regression equations for sorption data: ferricyanide, S = 20.5 - 19.8 exp; ferrocyanide, S = 22.2 - 24.1 exp; sulfate (presence of ferricyanide), S = 15 + 7.91 exp; sulfate (presence of ferrocyanide), S = 7.99 + 21.9 exp.

View larger version (11K): [in a new window]   Fig. 3. Sorption of iron–cyanide complexes and sulfate on goethite at variable sulfate and constant iron–cyanide complex concentrations at pH 3.5 (a, ferricyanide; b, ferrocyanide). Experimental conditions: ci = 0.05 to 0.9 mmol L-1; ci = 0.24 mmol L-1; I = 0.01 M. Regression equations for sorption data: ferricyanide, S = 18.5 - 18.3 exp; ferrocyanide, S = 17.5 - 1.5 exp; sulfate (presence of ferricyanide), S = 6.9 + 6.32 exp; sulfate (presence of ferrocyanide), S = 3.39 - 4.72 exp.

View larger version (26K): [in a new window]   Fig. 4. Desorption of iron–cyanide complexes by chloride solutions (0.04 to 1 M NaCl) at three initial pH values.

View larger version (23K): [in a new window]   Fig. 5. Desorption of iron–cyanide complexes by phosphate solutions (0.2 to 1.5 mM Na2HPO4) at three initial pH values.

View larger version (16K): [in a new window]   Fig. 6. Desorption of ferrocyanide by pH-adjusted phosphate solutions (0.24 to 15 mM Na2HPO4) at two initial pH values.