Adsorptive stripping voltammetric determination of vanadium as chloranilic acid complex.

Traces of vanadium(V) can be determined up to 21 ng/l by adsorptive stripping voltammetry using 2,5-dichloro-1,4-dihydroxy-3,6-benzoquinone (chloranilic acid) as complex forming reagent. The complex is stable in a 0.1 mol/l acetate buffer (pH 4.6) solution and adsorbed at the electrode surface in a potential range between -150 mV and -400 mV. The adsorption process is solved by alternating current (ac) voltammetric measurements. The method is applied to different real samples.