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Determination of Vanadium by Spectrophotometry with 2-(tetrazolylazo)-5-Diethylamino-Benzoic Acid as a Color Reagent

Liang Hua

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Abstract

A method for the determination of vanadium by spectrophotometry has been developed. The conditions of color reaction of a new reagent of 2(tetrazolylazo)5diethylaminobenzoic acid(TTZDBA)with vanadium(Ⅴ)are studied.The results show that the new color reagent reacts with vanadium and forms a stable purple red complex in the medium of HAcNaAc (pH 3.5). The apparent molar absorptivity is 3.52×104  L·mol-1·cm-1 and the maximum absorption wavelength is at 566 nm. Beer′s law is obeyed in the range of 0～0.8 mg/L for V(Ⅴ).The method has been applied to the direct determination of vanadium in an aluminium alloy sample and a synthetic water sample with satisfactory results. The recovery of standard addition is 101.3%～102.7% with precision of 1.0%～2.5% RSD(n=6).

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A method for the determination of vanadium by spectrophotometry has been developed. The conditions of color reaction of a new reagent of 2(tetrazolylazo)5diethylaminobenzoic acid(TTZDBA)with vanadium(Ⅴ)are studied.The results show that the new color reagent reacts with vanadium and forms a stable purple red complex in the medium of HAcNaAc (pH 3.5). The apparent molar absorptivity is 3.52×104  L·mol-1·cm-1 and the maximum absorption wavelength is at 566 nm. Beer′s law is obeyed in the range of 0～0.8 mg/L for V(Ⅴ).The method has been applied to the direct determination of vanadium in an aluminium alloy sample and a synthetic water sample with satisfactory results. The recovery of standard addition is 101.3%～102.7% with precision of 1.0%～2.5% RSD(n=6).

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Available abstract

A method for the determination of vanadium by spectrophotometry has been developed. The conditions of color reaction of a new reagent of 2(tetrazolylazo)5diethylaminobenzoic acid(TTZDBA)with vanadium(Ⅴ)are studied.The results show that the new color reagent reacts with vanadium and forms a stable purple red complex in the medium of HAcNaAc (pH 3.5). The apparent molar absorptivity is 3.52×104  L·mol-1·cm-1 and the maximum absorption wavelength is at 566 nm. Beer′s law is obeyed in the range of 0～0.8 mg/L for V(Ⅴ).The method has been applied to the direct determination of vanadium in an aluminium alloy sample and a synthetic water sample with satisfactory results. The recovery of standard addition is 101.3%～102.7% with precision of 1.0%～2.5% RSD(n=6).

Key concepts: Vanadium, Molar absorptivity, Reagent, Spectrophotometry, Chemistry, Benzoic acid, Color reaction, Nuclear chemistry

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