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Phosphates in Soils Treàted with Sewage Water: III. Kinetic Studies on the Reaction of Phosphate with Aluminum Compounds¹

ABSTRACT

The reaction of phosphate with aluminumhydroxide and Al₂O₃ was studied at an initial phosphate concentration level of 0.35 mmoles/liter and a temperature of 20C. Solutions of KH₂PO₄ and synthetic inorganic sewage water were used as phosphate sources. In all experiments involved, a marked change of the reaction rate was found after about 1 day in the case of Al(OH)₃ and about 4 days in the case of Al₂O₃. This can be explained by the assumption that at these points the formation of a solid aluminum-phosphate is initiated. This new phase was later identified as Sterrettite by means of electronmicroscopy, electron diffraction, and X-ray diffraction.

Key Words: adsorption • precipitation • phosphate fixation • crystalline aluminum phosphate

¹ Contribution from the Lab. of Soils and Fert., Agric. State Univ., 3 De Dreyen, Wageningen, the Netherlands. Support in part by the Comm. on Manure and Odour Problems in Animal Husbandry is gratefully acknowledged.

² Chemist, Graduate Student, and Soil Scientist, respectively.

Received for publication November 6, 1975.