Abstract
A new, simple, sensitive and selective kinetic spectrophotometric method was developed for the determination of ultra trace amounts of vanadium(V). The method is based on the catalytic effect of vanadium(V) on the oxidation of malachite green oxalate (MG) by bromate in acidic and micellar medium. The reaction was monitored spectrophotometrically by measuring the decrease in the absorbance of malachite green oxalate (MG) at 625 nm with a fixed-time method. The decrease in the absorbance of MG is proportional to the concentration of vanadium(V) in the range of 1-100 ng/mL with a fixed time of 0.5-2 min from the initiation of the reaction. The limit of detection is 0.71 ng/mL of vanadium(V). The relative standard deviation for the determination of 5, 30, 50 ng/mL of vanadium(V) was2.5% 2.6%, 2.4% and respectively. The method was applied to the determination of vanadium(V) in water samples.
Highlights
Vanadium is a biologically essential element[1].Its inclusion in enzymes such as bromoperoxide and nitrogenase reveals the importace of its redox chemistry
In order to overcome these problems, we developed and validated a rapid, sensitive and selective kinetic spectrophotometric method for the determination of vanadium(V)
An aliquot of the solution containing 1-100 ng/mL vanadium(V) was transferred into a 10 mL volumetric flask and 1.6 mL of 5.0 M phosphoric acid, 1.6 mL of 1.079×10-4 M malachite green oxalate (MG) and 2.8 mL Triton x-100 solution were added to the flask
Summary
Vanadium is a biologically essential element[1].Its inclusion in enzymes such as bromoperoxide and nitrogenase reveals the importace of its redox chemistry. Vanadium pentoxide dust and fumes are strong respiratory irritants, owing to their capacity to lessen the viability of alveolar macrophages, which play an important role in the lung defense against environmental contaminations.The determination of vanadium has received extensiveattention because of its increasing importance in biological and environmental studies This metal is widely distributed in the earth’s crust but in low abundance.Major sources for the emission of vanadium in the environment include combustion of fuel oils, dyeing, ceramics, ink, catalyst and steel manufacturing.Vanadium in trace amounts represents an essential element for normal cell growth, but it can be toxic when present in higher concentrations[7]. A 100 μg/mL stock standard solution of vanadium(V) was prepared by dissolving 0.023 g of NH4VO3 (Merck, W=116.94 g / mol) in distilled water and diluted to 100 mL in a 100 mL volumetric flask.
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