Application of alternating current polarography in determination of vanadium in fuels and asches

Polarographic behaviour of vanadium (4) on mercury dropping cathode in trapezoidal mode of alternating current polarography at the background of phosphate - and rhodanide-ions has been studied. At the background of rhodanide-acetate solutions in pH range of 0.6-2.5 an evidently pronounced and reprhducible peak of vanadium reduction with the potential -0.59 V is formed. The possibility of vanadium determination in the presence of Al3+, Cr3+, Fe3+, Fe2+, Mn2+, Ni2+, Co2+ is shown. The method of vanadium determination in oil, petroleum residue and asches is developed. The determination limit is 0.1 μg/ml