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Competitive Sorption of Arsenate and Phosphate on Different Clay Minerals and Soils

Dipartimento di Scienze del Suolo, della Pianta e dell'Ambiente, Università di Napoli Federico II, Via Università 100, 80055 Portici (Napoli), Italy

View larger version (15K): [in a new window]   Fig. 1. Amounts of PO4 (empty symbol) and AsO4 (full symbol) sorbed on (A) goethite, pyrolusite, (B)Andisol-16 and gibbsite. The surface coverage was near 100% for goethite, gibbsite, and pyrolusite and about 50% for Andisol-16.

View larger version (16K): [in a new window]   Fig. 2. (A) Amounts of AsO4 (expressed as percentages of AsO4 fixed in the absence of PO4; Table 3) sorbed on goethite and gibbsite in the presence of increasing concentration of PO4. (B) Amounts of PO4 (expressed as percentages of PO4 fixed in the absence of AsO4; Table 3) sorbed on goethite and gibbsite in the presence of increasing concentration of AsO4.

View larger version (13K): [in a new window]   Fig. 3. (A) Effect of contact time (h) on the sorption of PO4 and AsO4 on Andisol-16 at pH 5.0. The oxyanions were added alone (filled symbols) or as a mixture at an initial AsO4/PO4 molar ratio of 1 (open symbols). (B) Effect of contact time (h) on rf (rf = sorbed AsO4/sorbed PO4 molar ratio).