Spectrophotometric determination of copper(II) and nickel(II) using thiosemicarbazone of citral

Thiosemicarbazone of citral, a condensation product of industrially and ecofriendly terpenoid serve as very good analytical reagent for biologically important metal copper and nickel. The analytical properties of thiosemicarbazone of citral (CDOTSC) are described for the first time., The reagent gives brown colour complex with copper and grey colour complex with nickel in sodium acetate buffer medium of 5.6 and 2.6 respectively. The molar absorptivities of copper and nickel complexes respectively are 8.75 x 10(3) and 1.25 x 10(4) L mol(-1) cm(-1). These colour reactions have been investigated for the spectrophotometric determination of copper(II) and nickel(II) in aqueous medium.