First-derivative spectrometric analysis of mixtures of peroxo complexes of titanium,vanadium, and molybdenum for respective metals

The application of first-derivative spectrometry to the simultaneous determination of titanium and vanadium; titanium and molybdenum; and vanadium and molybdenum in their mixtures with varying mass ratios has been described with hydrogen peroxide as color developing reagent. At a first-derivative isosbestic point for the peroxo complex of one constituent, the derivative absorbance of the other constituent is read and used for quantitation. The procedure does not require the solution of simultaneous equations. The first-derivative spectrometry is also feasible at 450.0 nm for the selective determination of titanium in the presence of vanadium, molybdenum, and tungsten.