W. Frenzel, J. Oleksy-Frenzel, Jürgen Mörlen
May 25, 1992
Citations
0
Influential Citations
48
Citations
Journal
Analytica Chimica Acta
Abstract
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.