Rapid spectrophotometric determination of chromium(VI) using cyclohexane-1,3-dione bisthiosemicarbazone monohydrochloride

Abstract

Cyclohexane-1,3-dione bisthiosemicarbazone monohydrochloride produces coloured solutions with the chromium(VI) ion in a sodium acetate - hydrochloric acid medium. The yellow species obtained (molar absorptivity 1.2 × 10⁴ l mol^–1 cm^–1 at 370 nm) has been used for the spectrophotometric determination of micro-amounts of chromium(VI). Am important advantage of the method is that the tolerance limit for associated ions is very high. Hence this method can be used for the determination of chromium in alloy steels.