Phosphate ion precipitation

Calcium and Phosphate Ions Precipitate and Rupture Secreted Matrix Vesicles... 

Phosphorus species. Phosphate ions precipitate cadmium phosphate, white, readily soluble in acids, complexed by at least one phosphate group. Diphosphate ion, [PiOt]" ", precipitates the diphosphate this is soluble in excess reagent and in inorganic acids, but not in dilute CH3CO2H. The reaction is not hindered by the presence of either tartrate or 8263 (separation from copper). Other phosphates include NH4Cd(HP04)0H, CA catena- PO ]2 and CA icyclo-V O h-I4H2O. 

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