2 '-Hydroxyacetophenonebenzoylhydrazone as an analytical reagent for the spectrophotometric determination of vanadium(III)

2'-Hydroxyacetophenonebenzoylhydrazone (HABH) forms a light red 1 : 2 (V : HABH) complex with V-III species at 50-60 degrees in 0.12-0.20 M CH3COOH me dium which is extracted into benzene and has lambda(max) at 465 nm, The mol ar absorptivity, Sandell's sensitivity and standard deviation are 1.05 x 10 (4) dm(3) mol(-1) cm(-1), 0.0049 mu g V cm(-2) and +/-0.0006 respectively, at 465 nm, Beer's law is obeyed over the concentration range 0-1.5 mu g V m l(-1). Large number of elements do not interfere. The method can be used to determine vanadium in a wide variety of synthetic and technical samples in cluding alleged steel and reverberatory flue dust.