DETERMINATION OF VANADIUM IN SILICATE MATERIALS BY ATOMIC ABSORPTION SPECTROPHOTOMETRY

A method was developed for the determination of vanadium down to 5 p.p.m. in silicate materials on the basis of a 1-g sample. The absorption of the vanadium was measured after aspiration of a solution of the vanadium-cupferron complex in n-butyl acetate. Vanadium(V) was extracted, after oxidation with potassium periodate, from an aqueous solution containing 5% (v/v) of sulphuric acid and 50 mg of molybdenum (as molybdate), to avoid serious interference by other elements. Sodium phosphate was added to mask any iron, which can be tolerated in amounts up to 200 mg in the aqueous solution being extracted. © 1969.