Abstract
The study of the stability and physicochemical transformations of calcium and magnesium phosphate sorbents in a solution of calcium chloride and complexing agents: disodium salt of ethylenediaminetetraacetic acid and oxyethylidenediphosphonic acid established that calcium phosphates undergo no significant changes in aqueous systems under study, while magnesium phosphates (trimagnesium phosphate and magnesium hydrogenphosphate) are converted into calcium phosphates in solutions of CaCl2, therewith the introduction of ethylenediaminetetraacetic acid (EDTA) into the solution of CaCl2 has no significant effect on the magnesium phosphate conversion process, and introduction of oxyethylidene diphosphonic acid (OEDP) inhibits crystallization of calcium phosphate formed. Observed conversions should be considered when using magnesium and calcium phosphates as sorbents.
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