Application of spectral β-correction method and partial least squares for simultaneous determination of V(IV) and V(V) in surfactant media

Simultaneous determination of V(IV) and V(V) was performed by application of partial least squares when the calibration matrix was obtained using β-correction spectra. Two reaction between V(IV) and V(V) and Pyrogallol Red as a ligand in presence of cethyltrimethylammoniumbromide (CTAB) media has been investigated and applied to the simultaneous spectrophotometric determination of these species. The parameters controlling behavior of the system were investigated and optimum conditions selected. Determinations were made over the concentration range 0.6–4.50 μg ml−1 of V(IV) and 0.3–5.50 μg ml−1of V(V). Applying this method to simultaneous determination of these metal ions in several real samples with total relative standard error less than 5% validated the proposed method.