SPECTROPHOTOMETRIC DETERMINATION OF VANADIUM AS V(III) WITH DIBENZOYLMETHANE

A highly sensitive and selective method for the determination of trace amounts of vanadium is developed by effecting complexation of V(III), obtained on reduction of V(V) by dithionite, with dibenzoylmethane in neutral medium. The colored complex is extractable into chloroform, a bsorption maxima lying at 386 nm. The interfering effect of a large nu mber of elements is eliminated completely, which leads directly to the determination of the metal ion present in traces in samples. The meth od obeys Beer's law in the range 0-2.4 mug-V cm-3 with Sandell's sensi tivity of 2.46 x 10(-3) mug-V cm-2. Metal to ligand ratio in the extra cted species is determined as 1: 3.