Spectrophotometric Determination of lron(III), Cobalt (II) and Nickel(ll) with Acetothioacetanilide

Chemistry Department, The University of Burdwan, Burdwan 713101

Manuscript received 21 March 1975; revised 30 July 1975; accepted 30 July 1975

lron(llI), cobalt(II) and nickel(II) have been extracted into chloroform from solutions of pH 7.1-8.3, 8.4--11.9 and 6.8--8.3 respectively as acetothioacetanilide complexes. The absorbance values of the extracts were measured at 500 nm, 625 nm and 496 nm respectively against pure chloroform and the metals have been determined with relative standard deviation of ±0.19%, ±1.15% and ±1.47% in the same order. The effect of the presence of various foreign ions have been studied and a procedure for the estimation of nickel content of steel has been developed.