Nature 188, 1049 - 1050 (17 December 1960); doi:10.1038/1881049a0

Aluminium Ions in Aluminium Hydroxide, Phosphate and Soil–Water Systems

M. RAUPACH

Division of Soils, Commonwealth Scientific and Industrial Research Organization, Adelaide, South Australia.

IN recent years attention has been given to the solubility of aluminium phosphates in soils. Of the synthetic preparations examined, variscite, Al(OH)₂H₂PO₄, has been most extensively investigated and criteria for its existence in soils evaluated¹. It has been assumed that the solubility product of variscite can be determined from the activities of the ionic species in the expression K _sp = (Al³⁺)(OH^-)²(H₂PO₄ ^-) and predictions of the phosphate content of soils have been made on this basis².

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