Abstract

Anna Zharova^1,2, Ilia Komendo² and Roman Sandu³

DOI : http://dx.doi.org/10.13005/ojc/340115

The main aim of this research is to obtain high purity potassium dihydrogen phosphate solution with Al, Cr, Fe and Ti impurity content < 0.05 ppmw (5∙10^-6 wt.%) by the simple and effective process of impurities coprecipitation with insoluble precipitants. The completeness of the coprecipitation with different coprecipitants of the above-mentioned impurities in saturated potassium dihydrogen phosphate solutions (KH₂PO₄, KDP) was studied. Well-known coprecipitants such as inorganic phosphates, hydrated oxides and organic complexing agents were tried out to concentrate impurities in solid phase. Optimum conditions contributing to the maximum coprecipitation of the metal impurities were found for each coprecipitant. The obtained results are applicable both for KDP solution purification and for impurity concentration and separation in analytical chemistry.

KDP; Potassium Dihydrogen Phosphate; Coprecipitation; Inorganic Salts Purification

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