Abstract
The interactions between soluble orthophosphates and lime (CaCO3) have been extensively studied because of the frequent occurrence of soil systems rich in CaCO3 and the dominant effect of calcium carbonate on phosphate solubility. Several investigators have suggested that in these systems chemically defined calcium phosphate species are precipitated. Cole and Olsen1 found that the solubility of phosphate in calcareous soils seems to be controlled by a di-calcium phosphate (DCP) solid phase, although the solubility product inferred (2.89 × 10−9) is significantly less than that measured2 for DCP (2 × 10×7). Similar results have been reported for the interaction between fish-pond sediments and the aqueous phase3. On the other hand, Stum and Leckie4 have suggested that the solubility of phosphate in calcareous systems may be controlled by the chem-isorption of phosphate on CaCO3 particles, with the formation of amorphous calcium phosphates3 or of surface complexes.4 We now describe experiments which argue for the formation of a surface complex of calcium-carbonate–phosphate with well defined chemical composition.
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References
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Avnimelech, Y. Calcium-carbonate–phosphate surface complex in calcareous systems. Nature 288, 255–257 (1980). https://doi.org/10.1038/288255a0
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DOI: https://doi.org/10.1038/288255a0
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