2008•Metallurgical AnalysisRequires access

Study on the chromogenic reaction of vanadium(V) with 2-(2-thiazolylazo)-5-sulfopropylaminophenol and its application

Yunxiang Zhao

Abstract

The chromogenic reaction of 2-(2-thiazolylazo)-5-sulfopropylaminophenol (TASPAP) with vanadium(Ⅴ) in aqueous solution was studied.Ⅴ(Ⅴ) reacts with TASPAP to form a stable purple complex in the HAc-NaAc buffer solution at pH 4.2.The maximum absorption peak of this complex lies at 570 nm and the apparent molar absorptivity is 5.53×104L·mol-1·cm-1.Beer′s law is obeyed in the range 0-1.75mg of Ⅴ(Ⅴ) per litre.Fe(Ⅲ) was masked by EDTA-Zn solution.The method is highly selective and has been applied to the direct determination of vanadium in steel samples and water with the standard addition recoieries for water samples of 98.0%-102.4%,and the results for determining alloy steel samples are in agreement with certified results.

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Key concepts: Vanadium, Molar absorptivity, Chromogenic, Chemistry, Aqueous solution, Buffer solution, Spectrophotometry, Certified reference materials