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E-Journal of Chemistry
Volume 8, Issue 2, Pages 711-720
http://dx.doi.org/10.1155/2011/525912

Dual-Wavelength Spectral Correction Method for Simultaneous Determination of V(IV) and V(V)

R. Mirzajani and A. R. Kiasat

Chemistry Department, College of Sciences, Shahid Chamran University, Ahvaz, Iran

Received 21 July 2010; Accepted 5 September 2010

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Simultaneous determination of V(IV) and V(V) was performed when the calibration matrix was obtained using beta-corrected spectral data. The method is based on the reaction between V(IV) and V(V) and 4-(2-pyridylazo)-resorcinol (PAR) as a ligand at pH 6. Using β-correction technique true absorbance of chelate produced can be calculated because the quantity of absorbance, which has related to the fraction of reagent that reacted with metal ion and has been subtracted when reagent applied as reference by this correction has compensated. The parameters controlling behavior of the system were investigated and optimum conditions selected. Calibration model was constructed based on absorption spectra in the 540-600 nm range for 25 different mixtures of V(IV) and V(V) in the concentration ranges of 0.10-4.00 µgmL−1 of V(IV) and 0.10-5.00 µgmL−1of V(V). Applying this method to the analysis of mixtures of V(IV) and V(V) in waste water and soil samples with total relative standard error of less than 4.3% validated the proposed method.