Cyclohexane-1,3-dione bisthiosemicarbazone monohydrochloride as a spectrophotometric reagent for the rapid determination of chlorate in perchloric acid medium

Abstract

Cyclohexane-1,3-dione bisthiosemicarbazone monohydrochloride produces coloured solutions with chlorate ions in perchloric acid medium, in the presence of chloride ions. The yellow colour obtained (molar absorptivity 1.7 × 10⁴ l mol^–1 cm^–1 at a wavelength of 402 nm) has been used for the spectrophotometric determination of trace amounts of chlorate. The reaction is of considerable interest, as at present few useful colour reactions are known for the chlorate ion. An important advantage of using this reagent is the stability of the yellow coloured solution obtained.