Spectrophotometric determination of vanadium in fuel oil and stack gas using 2-[2-(3,5-dibromopyridyl)azo]-5-dimethylaminobenzoic acid
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 109 (4) , 461-463
- https://doi.org/10.1039/an9840900461
Abstract
Vanadium(V) reacts with 2-[2-(3,5-dibromopyridyl)azo]-5-dimethylaminobenzoic acid in aqueous acetone solution to give a blue colour with an absorbance peak at 640 nm. The colour in aqueous acetone solution was stable and the system conformed to Beer's law; the optimum range for measurement in 1.0-cm cells was 0.05–0.5 p.p.m. The reagent was very sensitive and reacted with vanadium(V) to form a 1 : 1 complex. The apparent molar absorptivity of the vanadium complex was 5.95 × 104 l mol–1 cm–1. Common anions and cations did not interfere. Interferences from copper, iron and nickel can be avoided by using the 8-hydroxyquinaldine extraction method. The proposed method is simple and sensitive and has been applied to the determination of vanadium in fuel oil and stack gas.Keywords
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