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Some Aspects of Zinc and Copper Phosphate Formation in Aqueous Systems¹

ABSTRACT

Zinc and copper systems were titrated with NaOH in the presence of varying amounts of KH₂PO₄. The data indicated zinc formed the orthophosphate, Zn₃(PO₄)₂ · 4H₂O while copper precipitated as the basic phosphate, Cu₅(H₂PO₄)₂(OH)₈. The pK_sp calculated from the dissociation of these phosphates at their respective isoelectric pH values were 47.9 and 92.5 for zinc and copper phosphate, respectively. Basic copper phosphate was less soluble than zinc orthophosphate at all pH levels studied.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California, Davis.

² Assistant Soil Chemist and Principal Laboratory Technician, respectively.

Received for publication April 23, 1961. Accepted for publication July 7, 1961.