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Spectrophotmetric determination of phenolic compounds by flow-injection analysis

✍ Scribed by Wolfgang Frenzel; Jolanta Oleksy-Frenzel; Jürgen Mörlen

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
677 KB
Volume
261
Category
Article
ISSN
0003-2670

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✦ Synopsis

Flow-inJection procedures for the spectrophotometrlc determmatlon of phenol by two different colour reactions have been developed The common Cammoantlpyrme (4-AAP) reaction and the oxldatwe coupling of phenol with 3-methyl-2-benzothlahne hydrazone (MBTH) are both readily applicable and permit the determmatlon of phenol at a samphng rate of 60 h-' and a relative standard devlatlon better than 3% The sensltwlty of the MBTH method IS about four times higher than that of the CAAP reaction, with detection limits of 12 and 30 gg/l phenol, respectively A study of the responses of the two methods to phenol derwatwes revealed particular merits and hmltations The 4-AAP reaction products have slmdar absorbance maxima but the reactlvlty IS comparatively low MBTH reacts with several para-substituted phenols and exhlblts higher response factors Because the absorption maxima of the products differ slgmficantly, a problem IS the appropriate choice of the measunng wavelength

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