Analytical Sciences

Abstract − Analytical Sciences, 17(8), 979 (2001).

Spectrophotometric Determination of Vanadium(V) in Minerals, Steels, Soil and Biological Samples Using Phenothiazine Derivatives
Mahaveer B. MELWANKI, Jaldappa SEETHARAMAPPA,  and Saraswati P. MASTI
Department of Chemistry, Karnatak University, Dharwad-580 003, India
Two simple, rapid and sensitive spectrophotometric methods have been proposed for the determination of vanadium(V) using butaperazine dimaleate (BPD) and propionyl promazine phosphate (PPP). These methods are based on the formation of red-colored radical cations on reaction with vanadium(V) in phosphoric acid medium, with their absorbance maxima at 513 nm. Beer's law is valid over the concentration range of 0.25 - 5.0 ug ml-1 and 0.2 - 4.0 ug ml-1, with Sandell's sensitivity values of 6.1 ng cm-2 and 6.0 ng cm-2 for BPD and PPP respectively. The proposed methods have been successfully applied to the analysis of vanadium steels, minerals, biological samples and soil samples.