Flow Injection Catalytic Determination of Vanadium using the Indicator Reaction between Victoria Blue B and Bromate and A Citric Acid Activator

Abstract

A flow injection catalytic method is proposed for determination of trace vanadium based on its catalytic action on a new indicator reaction between Victoria blue B (VBB) and potassium bromate in the presence of citric acid as an activator and in dilute sulfuric acid medium. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance of VBB injected at the maximum absorption wavelength of 618 nm. The detection limit is 0.5 ng ml' 1 and is independent of the initial valence state of vanadium. The relative standard deviation is 1.5% obtained from 11 standard solutions each containing 2115

Flow-injection spectrophotometric determination of vanadium with malachite green oxalate by bromate in acidic and micellar medium

“…Catalytic spectrophotometry 1 4.1-33.3 [13] Catalytic spectrophotometry 4 400-4000 [14] Catalytic spectrophotometry 0.02 0-2.5 [15] Catalytic spectrophotometry 0.5 1-240 [16] Catalytic spectrophotometry 0.01 0.05-8.0 [17] Catalytic spectrophotometry 3 4-520 [18] Catalytic spectrophotometry 0.0088 0.05-50 [19] Catalytic spectrophotometry 0.01 0-0.5 [20] Proposed method 0.0052 0.01-0.14 -…”

“…Major sources for the emission of vanadium in the environment include combustion of fuel oils, dyeing, ceramics, ink, catalysts, and steel manufacturing [4]. A variety of methods have been used for determining vanadium; these include fluorometry [5], gas chromatography [6], neutron activation analysis [7][8], X-ray fluorescence spectrometry [9], emission spectroscopy [10], atomic absorption spectroscopy [11], and catalytic methods [12][13][14][15][16][17][18][19][20]. Flow injection analysis has analytical advantages such as rapid response, automation, low cost, simple instruments, high reproducibility, and high selectivity that make it possible to determine trace levels of vanadium in real samples.…”