Adsorption of Phosphate by Aluminum and Iron in Soils1
- Pa Ho Hsu2
A slightly acid soil was treated with dilute phosphate solutions of pH 7 to study the mechanism of phosphate fixation. Two reactions operating at different rates were recognized. The one which proceeded more rapidly is believed to be due to surface adsorption of phosphate on the amorphous aluminum hydroxides and iron oxides already in this soil. The other, a much slower reaction, is due to the surface adsorption on similar amorphous hydroxides and oxides developed during the experiment. Experimental work showed that the solubilities of variscite, of synthetic Al(OH)2H2PO4, and of synthetic Fe(OH)2H2PO4 were considerably increased in the presence of this soil indicating that these compounds are not likely to be the products of fixation under these conditions.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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