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Fast simultaneous determination of BHA and TBHQ antioxidants in biodiesel by batch injection analysis using pulsed-amperometric detection

2012; Elsevier BV; Volume: 99; Linguagem: Inglês

10.1016/j.talanta.2012.06.024

1873-3573

Thiago F. Tormin, Rafael R. Cunha, Eduardo M. Richter, Rodrigo A.A. Muñoz,

Pesticide Residue Analysis and Safety

We report the first amperometric method for the simultaneous determination of butylated hydroxyanisole (BHA) and tert-butylhydroquinone (TBHQ) in biodiesel using batch-injection analysis (BIA) coupled to pulsed-amperometry. A sequence of potential pulses was selected in order to detect TBHQ and BHA separately in a single injection step at a glassy-carbon electrode. Samples were diluted in 50% v/v hydroethanolic solution with 0.1 mol L−1 HClO4 (supporting electrolyte) before injection using an electronic pipette. The method is highly precise (RSD<1%, n=10), fast (170 injections h−1), accurate (recovery between 100 and 110%), presents low detection limits (73 and 75 nmol L−1 BHA and TBHQ, respectively), and can be easily adapted for on-site determinations.