Spectrophotometric determination of vanadium(v) as its 6-chloro-3-hydroxy-2-[2' -( 5' -methylfuryl)]-4H -chromen-4-one complex

Department of Chemistry, Kurukshetra University, Kurukshetra-136 119, Haryana, India

Manuscript received 26 April 1999. revised 27 September 1999. accepted 12 February 2000

A simple and sensitive spectrophotometric method for the determination of vanadium(v) has been developed using 6-chloro-3-bydroxy-2-[2'-(5'-metbylfuryl)]-4H-chromen-4-one as a complexing ligand. The dark yellow (1 : 1) coloured species extracted into chloroform from 0.3 M CH₃COOH medium shows λ_max at 432 nm. The method is free from the interference of a large number of elements especially the platinum metals. It obeys Beer's law in the range of 0.2-1.4 µg ml^-1 V^v with molar absorptivity and Sandell's sensitivity of 3.98 x 10⁴ dm³ mol^-1 cm^-1 and 0.0012 µg cm^-1, respectively. Analysis of various synthetic and technical samples has been carried out with satisfactory and reproducible results.