Spectrophotometric determination of Pb(II), Fe(III) and Bi(III) in complexes with 1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid (DACT).

A UV spectrophotometric method was developed for simultaneous determination of ions: Pb(II), Fe(III) and Bi(III) in complexes with DACT. Zero-order and derivative spectra were used for the determinations. Under the established experimental conditions the described method furnished reliable results with low limit of detection (from 0.09 microg x mL(-1) to 1.75 microg x mL(-1)), high recovery (from 96.08% to 97.81%) and broad range of linearity for the analyzed ions. Good precision of the method was confirmed in experiments on model solutions containing mixtures of ions studied at different concentrations and in statistical analysis of the data obtained.