A new voltammetric method for the simultaneous determination of the antioxidants TBHQ and BHA in biodiesel using multi-walled carbon nanotube screen-printed electrodes

作者：Caramit Ricardo Pini; de Freitas Andrade Adriana Garabini; Gomes de Souza Joao Batista; de Araujo Tatiane Alfonso; Viana Luiz Henrique; Goncalves Trindade Magno Aparecido; Ferreira Valdir Souza

来源：Fuel, 2013, 105: 306-313.

DOI：10.1016/j.fuel.2012.06.062

• Biodiesel
• Antioxidants
• Surfactants
• Electroanalysis
• Screen-printed electrodes

An electroanalytical method for the simultaneous detection and quantification of tert-butylhydroquinone (TBHQ) and butyl hydroxyanisole (BHA) in biodiesel was developed using a voltammetric technique and screen-printed electrodes. The supporting electrolyte solution was composed of Britton-Robinson buffer (0.04 mol L-1) containing methanol (2.0%) and the cationic surfactant cetyltrimethylammonium bromide (CTAB). In the presence of CTAB, the peak current intensity and voltammetric resolution increased significantly for both studied antioxidants. Using the optimized conditions, the method presented a linear response in the concentration range of 5.0 x 10(-7)-1.0 x 10(-5) mol L-1 for TBHQ (r = 0.999) and BHA (r = 0.999) with detection limits of 3.40 x 10(-7) mol L-1 and 1.76 x 10(-7) mol L-1, respectively. The proposed method was successfully applied for the quantification of TBHQ and BHA in biodiesel samples after a simple and rapid dilution with recoveries from 97.90% to 110.0% and 91.90% to 101.0%, respectively. The obtained results were satisfactory when compared with those obtained using high-performance liquid chromatography (HPLC). Additionally, the proposed method can be easily adapted for on-site analysis.

• 出版日期2013-3