Voltammetric determination of tert-butylhydroquinone in biodiesel using a carbon paste electrode in the presence of surfactant

摘要: Abstract This paper reports an electroanalytical method developed for determining the antioxidant tert-butylhydroquinone (TBHQ) in biodiesel, based on enhancement effect of cetyltrimethylammonium bromide (CTAB). In pH 6.5 Britton–Robinson buffer, a poorly defined oxidation peak was observed TBHQ at carbon paste electrode (CPE). presence low concentrations CTAB, however, current markedly increased. Several parameters were studied and optimized development this methodology, under optimal conditions proportional to concentration range (1.05–10.15) × 10 −6  mol L −1 , with limits detection quantification 7.11 × 10 −8 2.37 × 10 −7 respectively, by linear sweep voltammetry (LSV). The applied determination soybean biodiesel samples. results satisfactory comparison those obtained using high-performance liquid chromatography (HPLC).