HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hsu, P. H. Search for Related Content PubMed Articles by Hsu, P. H. Agricola Articles by Hsu, P. H.

Adsorption of Phosphate by Aluminum and Iron in Soils¹

ABSTRACT

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.

¹ Contribution No. 63-26 from the College of Mineral Industries, The Penn. State Univ. Presented before Div. II, Soil Sci. Soc. Am., Ithaca, N. Y., Aug. 21, 1962. The author expresses his sincere thanks to Drs. T. F. Bates and D. E. Baker, Penn. State Univ., for their critical review and comments in the preparation of this report.

² Research Associate in Mineralogy.

Received for publication August 26, 1963. Accepted for publication March 11, 1964.