Precipitation of Phosphorus as NH4[MgPO4] · xH2O in the Presence of Citrates, d,l-tartaric Acid, and Their Complexes with Vanadium and Molybdenum
Russian Journal of Inorganic Chemistry
, E-ISSN: 1531-8613
Boreskov Institute of Catalysis SB RAS
For determination of phosphorus in Mo-V-phosphoric heteropoly acid solutions, it must be separated from considerable amounts of vanadium and molybdenum by precipitation as NH4[MgPO4] · xH2O. It is shown that the known method of its precipitation in citrate medium is too slow because of low reactivity of Mg(II)-citrate complexes. We propose to precipitate NH4[MgPO4] · xH2O in the presence of d,l-tartaric and next to purify the prepared precipitate. This method permits to shorten preparation of the pure precipitate in several times.