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The Nature of Phosphate Sorption by Calcium Carbonate¹

ABSTRACT

Studies on the nature of phosphate sorption by calcium carbonate indicate that when soluble phosphate fertilizers are added to calcareous soils, the reactions with calcium carbonate consist of rapid monolayer sorption on CaCO₃ surfaces and, at high phosphate concentrations in the vicinity of fertilizer particles, the precipitation of dicalcium phosphate, or a compound with similar properties. The initial products of these reactions are characterized by very high specific surfaces and greater phosphorus solubility than the stable hydroxyapatite or fluorapatite. Dynamic equilibrium in calcareous soils involves all of these forms of phosphate. Some of the effects of the ionic environment on solubility of calcium phosphates were calculated and experimentally verified.

¹ This work was conducted cooperatively with the Colorado Agr. Exp. Sta., Colorado A & M College, Fort Collins, Colo. Authorized by the director of the Colorado A & M Agr. Exp. Sta. for publication as Scientific Journal Series No. 410. Presented before Division IV, Soil Science Society of America, Cincinnati, Ohio, Nov. 20, 1952.

² Division of Soil and Plant Relationships B.P.I.S.A.E., U. S. Dept. of Agriculture, Fort Collins, Colo. The authors wish to acknowledge the helpful assistance of William L. Hill.

Received for publication March 20, 1953.