Spectrophotometric determination of Vanadium(V) in traces using solvent extraction technique

Abstract

A simple, rapid, sensitive and selective extractive method of spectrophotometric determination of vanadium(V) using 6-chloro-3-hydroxy-2-(4-methoxyphenyl)-4-oxo-4H-1-benzopyran (CHMPB) as a new complexing reagent has been developed. A 1:2 yellow V(V) – CHMPB complex is formed at 425 nm in CH₃COOH medium which is extractable into toluene and is stable for more than 6 hrs. The formed complex shows Beer’s law validity in the range  0.0-2.4 µg V ml^-1 with a molar absorptivity and Sandell’s sensitivity of 1.73 x 10⁴ l mol^-1 cm^-1 and 0.0033 µg V cm^-2, respectively at 425 nm. The method has good reproducibility , is free from the interference of a large numbers of elements and applied successfully to various synthetic and industrial samples including reverberatory flue dust and water samples.