Abstract
A micro amount of vanadium contained in common salt was determined by graphite furnace atomic absorption spectrophotolnetry in conjunction with extraction technique. Vanadium is reacted with 3, 5-dibromosalicylaldehyde-2-benzothiazolylhydrazone (BSTH) to form a stable complex in the presence of zephiralnine, which is extracted into chloroform and then back-extracted with a small amount of hydrochloric acid into aqueous phase. Vanadium concentrated in aqueous phase is determined by graphite furnace atomic absorption spectrophotometry. The optimum conditions on the extraction and the back-extraction for concentration of vanadium were examined. Micro amount of vanadium was quantitatively extracted into 10ml of 5.0×10-4 MBSTH chloroform solution in the presence of zephiramine from aqueous solution at pH3.8, by shaking 10min. And then extracted complex was back-extracted with 0.5ml of 3.5 M hydrochloric acid into aqueous phase. When a known amount of vanadium was added to the common salt samples, vanadium was recovered satisfactorily. The proposed method has been successfully applied to the determination of micro amount of vanadium in colnmon salt. The method is simple, rapid, and sensitive for the determination of vanadium.
