METHOD OF PURIFYING AQUEOUS SOLUTIONS FROM IRON (III) Russian patent published in 2015 - IPC C02F1/64 G01N33/18 C01G49/00 C02F101/20 

FIELD: chemistry.

SUBSTANCE: invention can be used in analytical chemistry of iron, particularly for concentration of iron (III) from water and aqueous solutions and quantitative determination of iron (III) in a concentrate. To carry out the method, iron (III) is precipitated from an aqueous solution into a solid phase in the formed two-phase system. The method includes placing an analysed sample in a glass vial, acidifying with hydrochloric or sulphuric acid to obtain hydrogen ion concentration of 0.1-0.2 mol/l in the final volume of 20.00 ml, adding equal volumes of 5.00 ml each of aqueous solutions of 0.4 M antipyrine and 2 M sodium perchlorate, diluting with distilled water to 15.00 ml, tightly closing the vial with a plug, intensely shaking for 10 minutes, settling at room temperature, filtering the iron (III) free mother solution from the precipitate and determining content of iron (III) in the concentrate-precipitate with known techniques.

EFFECT: method enables to purify water and aqueous solutions of salts of different metals from iron (III) in a wide range of acidity of quantitative extraction of iron precipitate, simple process, improved safety and environmental friendliness of the purification method.

5 dwg, 2 tbl