Catalytic polarographic determination of vanadium (V) by using double polarographic peak

Document Type

Article

Publication Date

12-1-2000

Abstract

A new catalytic polarographic method for the determination of trace amounts of vanadium(V) has been proposed. The method is based on the catalytic effect of V(V) on the oxidation reaction between ethyl orange and bromate in the medium of sulfuric acid, with tartaric acid as an activator. Ethyl orange and its oxidation product exhibits voltammetric peak at - 0.62 V and - 0.52 V (vs .SCE) in ammoniacal buffer solution respectively. Under optimal experiment condition, the reaction was monitored by measuring the peak height decrease at - 0.62V (ΔI′p1) and the peak height increase at - 0.52V (ΔI′p1). Vanadium is determined according to ΔI = (ΔI′p1 + ΔI′p2), the linear range of determination is 0.25 ∼ 3.50 μg/L for vanadium(V), the detection limit is 0.12 μg/L. The method has been used to determine trace vanadium in food samples.

Publication Source (Journal or Book title)

Fenxi Huaxue

First Page

1142

Last Page

1143

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