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Competitive Adsorption of Arsenate and Arsenite on Oxides and Clay Minerals

Salinity Laboratory, 450 W. Big Springs Road, Riverside, CA 92507

View larger version (24K): [in a new window]   Fig. 1. Arsenic adsorption on amorphous Al oxide as a function of pH and As redox state: (a) arsenate; (b) arsenite. Single ion systems: AsT = 20 µM. Binary systems: AsT = AsT = 20 µM. Suspension density: 1 g L-1.

View larger version (25K): [in a new window]   Fig. 2. Arsenic adsorption on amorphous Fe oxide as a function of pH and As redox state: (a) arsenate; (b) arsenite. Single ion systems: AsT = 20 µM. Binary systems: AsT = AsT = 20 µM. Suspension density: 0.5 g L-1.

View larger version (27K): [in a new window]   Fig. 3. Arsenic adsorption on kaolinite as a function of pH and As redox state: (a) arsenate; (b) arsenite. Single-ion systems: AsT = 20 µM. Binary systems: AsT = AsT = 20 µM. Suspension density: 40 g L-1.

View larger version (26K): [in a new window]   Fig. 4. Arsenic adsorption on illite as a function of pH and As redox state: (a) arsenate; (b) arsenite. Single-ion systems: AsT = 20 µM. Binary systems: AsT = AsT = 20 µM. Suspension density: 40 g L-1.

View larger version (26K): [in a new window]   Fig. 5. Arsenic adsorption on montmorillonite as a function of pH and As redox state: (a) arsenate; (b) arsenite. Single-ion systems: AsT = 20 µM. Binary systems: AsT = AsT = 20 µM. Suspension density: 40 g L-1.

View larger version (22K): [in a new window]   Fig. 6. Application of the constant capacitance model to As adsorption on amorphous Al oxide as a function of solution pH: (a) fit to arsenate adsorption in single-ion system; (b) fit to arsenite adsorption in single ion system; (c) prediction of competitive arsenate and arsenite adsorption in binary system. Model results are indicated by solid lines.

View larger version (20K): [in a new window]   Fig. 7. Application of the constant capacitance model to As adsorption on amorphous Fe oxide as a function of solution pH: (a) fit to arsenate adsorption in single-ion system; (b) fit to arsenite adsorption in single-ion system; (c) prediction of competitive arsenate and arsenite adsorption in binary system. Model results are indicated by solid lines.

View larger version (22K): [in a new window]   Fig. 8. Application of the constant capacitance model to As adsorption on KGa-2 kaolinite as a function of solution pH: (a) fit to arsenate adsorption in single ion system; (b) fit to arsenite adsorption in single ion system; (c) prediction of competitive arsenate and arsenite adsorption in binary system. Model results are indicated by solid lines.

View larger version (21K): [in a new window]   Fig. 9. Application of the constant capacitance model to As adsorption on IMt-2 illite as a function of solution pH: (a) fit to arsenate adsorption in single ion system; (b) fit to arsenite adsorption in single-ion system; (c) prediction of competitive arsenate and arsenite adsorption in binary system. Model results are indicated by solid lines.

View larger version (22K): [in a new window]   Fig. 10. Application of the constant capacitance model to As adsorption on SAz-1 montmorillonite as a function of solution pH: (a) fit to arsenate adsorption in single ion system; (b) fit to arsenite adsorption in single ion system; (c) prediction of competitive arsenate and arsenite adsorption in binary system. Model results are indicated by solid lines.