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ALUMINIUM AND IRON PHOSPHATE STUDIES RELATING TO SOILS
Author(s) -
BACHE B. W.
Publication year - 1963
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1963.tb00936.x
Subject(s) - solubility , phosphate , chemistry , aqueous solution , solubility equilibrium , hydrolysis , inorganic chemistry , soil water , aluminium , metal , metal ions in aqueous solution , equilibrium constant , phosphate minerals , organic chemistry , geology , soil science
Summary The reactions of variscite, AlPO 4 ·2H 2 O, and of strengite, FePO 4 ·2H 2 O, with dilute aqueous solutions have been investigated. Particular attention has been given to the effects of time of reaction, pH of solution, and the solution/solid ratio. Thermodynamic solubility constants are maintained only at low pH values, viz.:Surface hydrolysis reactions occur at higher pH values, releasing phosphate ions into solution and forming more basic insoluble metal phosphates. Solubility equilibria of these minerals are not likely to be relevant in soils at equilibrium.