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 HighWire Citing Articles via Google Scholar Google Scholar Articles by Ainsworth, C. C. Articles by Sumner, M. E. Search for Related Content PubMed Articles by Ainsworth, C. C. Articles by Sumner, M. E. Agricola Articles by Ainsworth, C. C. Articles by Sumner, M. E.

Effect of Aluminum Substitution in Goethite on Phosphorus Adsorption: II. Rate of Adsorption¹

ABSTRACT

The effects of initial pH, P concentration, Al substitution and method of synthesis on the rate of phosphate adsorption by a series of -FeOOH samples containing up to 30 mol % Al were investigated. The results, plotted as first-order reactions with respect to phosphate disappearance, were characterized by an initial fast phase followed by a pseudo-first-order reaction. An approximation of the magnitude of the fast phase was made by extrapolating the first-order line back to zero time. The difference between the initial and zero time first-order concentration was then considered to be the magnitude of the rapid phase of the reaction. Phosphate concentration, initial pH, and method of synthesis influenced this parameter. Al substitution had little effect. However, Al substitution did affect the pseudo-first-order rate constant at all pH levels and lower P concentrations. It is postulated that Al substitution may sterically hinder the sorption of phosphate. The various synthesis methods affected the magnitude of the fast phase and the pseudo-first-order rate. This may be due to the apparent change in the number of active sites related to changes in synthesis as discussed in part 1.

¹ Contribution from the Agron. Dep., College Stn., Univ. of Georgia, Athens, GA 30602.

² Former Graduate Research Assistant and Professor, Agron. Dep., Univ. of Georgia, Athens, GA 30602.

Received for publication March 6, 1984. Accepted for publication February 25, 1985.

This article has been cited by other articles:

				J. O. Agbenin Extractable Iron and Aluminum Effects on Phosphate Sorption in a Savanna Alfisol Soil Sci. Soc. Am. J., March 1, 2003; 67(2): 589 - 595. [Abstract] [Full Text] [PDF]