METHOD OF QUANTITATIVELY DETERMINING IRON IN PHOSPHORIC ACIDS OBTAINED VIA SULFURIC ACID-ASSISTED DECOMPOSITION OF PHOSPHATE FEEDSTOCK FOLLOWED BY TRIBUTYL PHOSPHATE-ASSISTED PURIFICATION THEREOF

摘要

FIELD: analytical methods.;SUBSTANCE: method comprises diluting test sample of acid with orthophosphoric acid reagent at volume ratio of diluent to solution being analyzed equal to 1:(0.002-1) followed by photometric measurement within wavelength range 200-270 nm. A diluent, aqueous solutions of orthophosphoric acid reagent with P₂O₅ concentration 10-40% are used.;EFFECT: reduced consumption of reagents, number of operations, and analysis time.;2 cl, 1 tbl