Abstract
tert-Butylhydroquinone (TBHQ) and tert-butylhydroxyanisole (BHA) are oxidized on a glassy carbon electrode modified with multiwalled carbon nanotubes in a 0.1 M LiClO4 supporting electrolyte in the medium of 1 mM Brij®35 at 0.27 and 0.47 V, respectively. A method for their chronoamperometric determination is developed. It is shown that a steady-state electrolysis is achieved within 100 s. The analytical range is 2.50–1000 µM for TBHQ and 1.50–100 and 250–1000 µM for BHA with the detection limits (S/N = 3) 0.64 and 0.38 µM, respectively. The relative standard deviation in the determination of TBHQ and BHA in model solutions does not exceed 6%. The method was tested on micellar extracts of linseed oils. The accuracy measure is 100 ± 1%, which points to the absence of matrix effects in the determination of TBHQ and BHA.
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Original Russian Text © G.K. Ziyatdinova, K.S. Os’kina, E.R. Ziganshina, H.C. Budnikov, 2015, published in Zhurnal Analiticheskoi Khimii, 2015, Vol. 70, No. 12, pp. 1310–1315.
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Ziyatdinova, G.K., Os’kina, K.S., Ziganshina, E.R. et al. Chronoamperometric determination of synthetic phenolic antioxidants in Brij® 35 micellar medium. J Anal Chem 70, 1501–1506 (2015). https://doi.org/10.1134/S1061934815120175
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DOI: https://doi.org/10.1134/S1061934815120175