Rapid extraction and spectrophotometric determination of vanadium(IV) with thiothenoyltrifluoroacetone

Abstract

Thiothenoyltrifluoroacetone in carbon tetrachloride—butanol (1:1) is used for extraction and spectrophotometric determination of vanadium (IV) at pH 4·5–5. The greenish—yellow complex is measured spectrophotometrically at 450 nm. The system conforms to Beer's law over the range 2–11 μg/ml of extract. The colour of the complex is stable for at least 80 hr. Vanadium (IV) was quantitatively extracted and determined in the presence of 120:1 w/w ratios of various ions. The method was made selective by using common sequestering agents or prior extraction with tributyl phosphate, diethylammonium diethyldithiocarbamate, α-furildioxime or acetylacetone. The method is rapid, simple, selective and sensitive.