Extractive photometric simultaneous determination of iron(II) and copper(II) with syn-phenyl-alpha-pyridyl ketoxime and analysis of ferrites

A rapid method of simultaneous spectrophotometric determination of up to 4 ppm of iron(II) and 20 ppm of copper(II) in a mixture by chloroform extraction of the syn-phenyl-alpha-pyridyl ketoxime complexes at pH 10.0, is developed. Measurements are made at 550 and 475 nm. Two simultaneous equations are solved to obtain the concentrations of the two ions. Analysis of five synthetic mixtures in triplicate gave relative standard deviations of 0.7% for Fe(II) and 1.1% for Cu(II).