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Phosphate Adsorption on an Oxisol¹

ABSTRACT

Adsorption isotherms for phosphate on the A and B horizon of an oxisol from Papua New Guinea showed high affinity adsorption at low solution concentrations and a linear increase in adsorption at higher solution concentrations. Adsorption increased with decrease in pH in the range 3 to 8. Comparison with data obtained under similar conditions with synthetic goethite (-FeOOH) and gibbsite [Al(OH)₃] suggested that phosphate reacted with FeOH and FeOH₂⁺ groups on soil iron oxide surfaces to form a binuclear bridging FeOP(O₂)OFe complex and with exposed Al(OH)H₂O on kaolinite edges and on hydroxy-aluminum species to form a binuclear or bidentate phosphate complex. At higher phosphate concentrations isotherms showed continued adsorption which may be due to a further reaction involving hydroxy-aluminum groups.

¹ Contribution from the Agric. Dep. Univ. of Papua New Guinea, P.O. Box 4820, P.N.G.

² Senior Lecturer in Soil Science, Soil Bureau, D.S.I.R., Lower Hutt, New Zealand.

Received for publication April 18, 1977. Accepted for publication August 1, 1977.

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