期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 79, 期 2, 页码 409-414出版社
ELSEVIER
DOI: 10.1016/j.colsurfb.2010.05.008
关键词
TBHQ; Carbon paste electrode; Bromide cetyltrimethylammonium; Determination; Biodiesel
资金
- Fundacao de Apoio ao Desenvolvimento do Ensino, Ciencia e Tecnologia do Estado de Mato Grosso do Sul-FUNDECT [23/200.222/2007]
This paper reports an electroanalytical method developed for determining the antioxidant tert-butylhydroquinone (TBHQ) in biodiesel, based on the enhancement effect of cetyltrimethylammonium bromide (CTAB). In pH 6.5 Britton-Robinson buffer, a poorly defined oxidation peak was observed for TBHQ at a carbon paste electrode (CPE). In the presence of low concentrations of CTAB, however, the oxidation peak current was markedly increased. Several parameters were studied and optimized for the development of this methodology, and under optimal conditions the oxidation peak current was proportional to TBHQ concentration in the range of (1.05-10.15) x 10(-6) mol L-1, with limits of detection and quantification of 7.11 x 10(-8) mol L-1 and 2.37 x 10(-7) mol L-1, respectively, by linear sweep voltammetry (LSV). The method was applied to TBHQ determination in soybean biodiesel samples. The results were satisfactory in comparison with those obtained using high-performance liquid chromatography (HPLC). (C) 2010 Elsevier B.V. All rights reserved.
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