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The Dissolution of Complex Ferric Phosphates Under Controlled E_h and pH Conditions¹

ABSTRACT

The dissolution of complex ferric phosphates, CaFe₂H₄(PO₄)₄ · 8H₂O and KFe₃H₁₄(PO₄)₈ · 4H₂O, was studied in a reduced chemical system. Both salts dissolved incongruently to release calcium and phosphorus in a molar ratio of 1:2 and solid FePO₄. Below an E_h of — 200 mV further P was released due to FePO₄ dissolution. Potassium ferric phosphate crystals dissolved rapidly with complete release of K, whereas dissolution of calcium ferric phosphate was retarded probably due to interference by precipitated FePO₄. The solubility of precipitated FePO₄ differed slightly from that observed with crystalline strengite and at pH 6 and 7, ferric hydroxides apparently entered into the reaction.

¹ Contribution from Dep. of Agronomy (Soils), Louisiana State Univ., Baton Rouge, La. 70803. This study was conducted in co-operation with Tennessee Valley Authority, Muscle Shoals, Alabama.

² Senior Research Scientist on leave from C.S.I.R.O., Division of Land Research, P.O. Box 1666, Canberra, Australia and Professor of Soils, respectively.

Received for publication November 15, 1971. Accepted for publication October 20, 1972.