Abstract
Titration curves of crystalline zirconium phosphate with alkaline earth metal hydroxides are strongly affected by hydrolysis of the exchanger and precipitation of insoluble phosphates. The degree of conversion of the exchanger at which phosphate precipitation begins depends on the alkaline earth metal ion, and the following values have been obtained: 70% for Ca 2+, 80% for Sr 2+ and 10% for Ba 2+. No exchange has been found with Mg(OH) 2, and this is probably due to steric reasons owing to its large hydrated ionic radius. X-ray diffraction shows that the exchange of Ca 2+ and Sr 2+ occurs with formation of the phases ZrCa 0·63(PO 4) 1·26(HPO 4) 0·74. 3H 2O and ZrSr 0·5PO 4. 3·5H 2O, with interplanar distances 9·98 and 10·2 A, respectively. Owing to their immiscibility with Zr(HPO 4) 2. H 2O a plateau in their titration curve is found. The results are compared with those reported by other authors.
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