Spectrophotmetric determination of phenolic compounds by flow-injection analysis

doi:10.1016/0003-2670(92)80199-H

Analytica Chimica Acta

Volume 261, Issues 1–2, 25 May 1992, Pages 253-259

https://doi.org/10.1016/0003-2670(92)80199-H Get rights and content

Abstract

Flow-injection procedures for the spectrophotometric determination of phenol by two different colour reactions have been developed. The common 4-aminoatnipyrine (4-AAP) reaction and the oxidative coupling of phenol with 3-methyl-2-benzothiazoline hydrazone (MBTH) are both readily applicable and permit the determination of phenol at a sampling rate of 60 h⁻¹ and a relative standard deviation better than 3%. The sensitivity of the BMTH method is about four times higher that of the 4-AAP reaction, with detection limits of 12 and 30 μg/l phenol, respectively. A study of the response of the two methods to phenol derivatives revealed particular merits and limitations. The 4-AAP reaction prouducts have similar absorbance maxima but the reactivity is comparatively low. MBTH reacts with products differ singificantly, a problem is the appropriate choise of the measuring wavelength.

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Spectrophotmetric determination of phenolic compounds by flow-injection analysis

Abstract

Anal. Chem.

Fresniu'Z. Anal. Chem.

J. Chromatogr.

Chromatographia

Anal. Chem.

Fresnius J. Anal. Chem.

Justus Leibigs Ann. Chem.