Phosphorus adsorption by kaolinite and montmorillonite: I. Effect of time, ionic strength, and pH

B. Bar-Yosef, U. Kafkafi, R. Rosenberg, G. Sposito

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Phosphate reactions in soils are affected by various factors operating simultaneously. The objective of this work was to study specific effects of total P concentration, pH, ionic strength, and equilibration time on P partitioning between solid and solution phases of Ca- and K-kaolinite and -montmorillonite suspensions as model systems of soils containing these minerals decreased Cp in both clay systems. Phosphorus adsorption by Ca-clay exceeded that by K-clay. This, and the effect of EC on Cp are suggested to operate via their effect on the extent of the diffuse double layer, which determine the accessibility of P to adsorption sites on clays' edges. Phosphorus solution concentration as a function of pH was minimal in the studied clays around pH 6. In the investigated pH range (5-9), P partitioning was controlled by adsorption, which could be described by a modified Langmuir model. The model accounts for effects of Cp and pH on adsorption and considers retention of individual P species by the adsorbent. -from Authors

Original languageEnglish
Pages (from-to)1580-1585
Number of pages6
JournalSoil Science Society of America Journal
Volume52
Issue number6
DOIs
StatePublished - 1988
Externally publishedYes

Fingerprint

Dive into the research topics of 'Phosphorus adsorption by kaolinite and montmorillonite: I. Effect of time, ionic strength, and pH'. Together they form a unique fingerprint.

Cite this