Determination of vanadium by its catalytic effect on the oxidation of gallocyanine with spectrophotometric flow injection analysis

Authors: Ali A Ensafi, A Kazemzadeh

Publication date: 1996/2/29

Journal name: Microchemical journal

Volume: 53

Pages: 139-146

Publisher: Elsevier

The use of a gallocyanine-bromate oxidation system for the direct determination of
vanadium (0.020–100 ng/ml) with spectrophotometric detection is described. The decrease
in absorbance results from the oxidation of gallocyanine by bromate in the presence of
vanadium as a catalyst. The effects of important parameters, such as reagent concentration,
reagent flow rates, sample volume, length of the reaction coil, and temperature, are reported.
Vanadium can be determined at a rate of 40±5 samples/h. The limit of detection is 2 pg of ...