Spectrophotometric Determination of Trace Cobalt with the New Reagent 2-(2-Thiazolylazo)-5-diethylaminobenzoic Acid

Abstract

Abstract: 2-(2-Thiazolylazo)-5-diethylaminobenzoic acid (TAEB) was synthesized and studied as a new reagent for the spectrophotometric determination of trace amount of cobalt. Its acid dissociation constants both in the absence and in the presence of Triton X-100 were determined. In a pH2.6~4.8 medium TAEBreacts with cobalt (Ⅲ) ions to form a stable complex, exhibiting an absorption maximum at 672nm. The molar absorptivity was found to be 1.26×10⁵dm³·mol^-1·cm^-1. The constituent of the complex was established as Co:TAEB =1:3. Interference from copper, nickel, iron and chromium ions and etc. can be eliminated by acidification with HCl after cobalt complex is formed. The method has been used for the determination of trace cobalt in steel and iron directly with satisfactory results.

Key words: Cobalt determination, Spectrophotometry, 2-(2-Thiazolylazo)-5-diethyl-aminobenzoic acid reagent

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Shen Hanxi, Li lianjun . Spectrophotometric Determination of Trace Cobalt with the New Reagent 2-(2-Thiazolylazo)-5-diethylaminobenzoic Acid[J]. Chem. J. Chinese Universities, 1988, 9(10): 1077.

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Spectrophotometric Determination of Trace Cobalt with the New Reagent 2-(2-Thiazolylazo)-5-diethylaminobenzoic Acid

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