Determination of Vanadium by Its Catalytic Effect on the Oxidation of Gallocyanine with Spectrophotometric Flow Injection Analysis

✍ Scribed by Ali A. Ensafi; A. Kazemzadeh

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 132 KB
• Volume: 53
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1996.0019

✦ Synopsis

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 V(V) for a 200 l of sample volume. The relative standard deviation for 10 replicated determinations of 1.00 ng/ml of V(V) is 1.1%. A new manifold is proposed for the elimination of potential interferences. The system was also applied for the determination of vanadium in serum, petroleum crude, and river water.