Mutual adsorption of lead (Pb) and phosphorus (P) at pH 5 onto three soil\nclays materials (kaolinite, montmorillonite, and allophane) was studied to\nknow interaction of the anion and the cation at surface of the clays. Adsorption\nof Pb was determined on montmorillonite, kaolinite and allophane with\nthe following pretreatments; 1) untreated clay (control), 2) phosphate treated\nclay (P-clay) and 3) clay pre-treated with both P and Pb (P-Pb-clay). Adsorption\nof P was determined on montmorillonite, kaolinite and allophane with\nthe following pretreatments; 1) control 2) Pb treated clay (Pb-clay) and 3)\nP-Pb-clay. The adsorption of Pb on the untreated clays was in the order:\nmontmorillonite > allophane > kaolinite. On allophane and kaolinite Pb adsorption\nwas in the order P-clay > P-Pb-clay > control. For montmorillonite,\nthe trend was: P-Pb-clay = control > P-clay. Phosphorus adsorption was in the\norder Pb-clay = P-Pb-clay > control for montmorillonite and kaolinite,\nPb-clay > control > P-Pb-clay for allophane. The findings suggested that\npre-treatment with phosphate increases Pb adsorption on kaolinite and allophane,\nand decrease on montmorillonite, while pretreatment with Pb increases\nphosphate sorption on all clays, and both Pb and P increased adsorption\non montmorillonite and kaolinite and decrease on allophane.
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