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Effects of pH and Electrolytes on Inositol Hexaphosphate Interaction with Goethite

Università di Torino, DIVAPRA-Chimica Agraria via Leonardo da Vinci 44, Grugliasco 10095 (TO) Italy

View larger version (146K): [in a new window]   Fig. 1. Transmission electronic micrograph of goethite

View larger version (10K): [in a new window]   Fig. 2. Variation of (a) zeta potential () and (b) apparent particle size (dz) of goethite with pH in 0.01 M KCl and 0.0033 M CaCl2

View larger version (9K): [in a new window]   Fig. 3. Effect of the pH on sorption of inositol hexaphosphate (IHP) and inorganic phosphate (Pi) by goethite in 0.01 M KCl: Variation of (a) the sorbed amount (Qa), (b) zeta potential (), and (c) apparent particle size (dz) with the pH

View larger version (8K): [in a new window]   Fig. 4. Effect of the pH on sorption of inositol hexaphosphate (IHP) and inorganic phosphate (Pi) by goethite in 0.0033 M CaCl2: variation of (a) the sorbed amount (Qa), (b) zeta potential (), and (c) apparent particle size (dz) with the pH

View larger version (13K): [in a new window]   Fig. 5. Aqueous speciation of inositol hexaphosphate (IHP) and inorganic phosphate (H2PO-4) at increasing pH

View larger version (27K): [in a new window]   Fig. 6. Mechanism of adsorption of myo-inositol hexaphosphate on the goethite surface at pH 4.5. For the sake of simplicity, the H and OH of the phosphate groups were omitted (by Ognalaga et al., 1994)

View larger version (11K): [in a new window]   Fig. 7. Precipitate formation of Ca3-IHP and CaHPO4 at increasing pH. On the y axis the activity of IHP6- or H2PO-4 is reported