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

TALANTA

卷:99

Article

Tormin, Thiago F.¹  Cunha, Rafael R.¹  Richter, Eduardo M.¹  Munoz, Rodrigo A. A.¹ 

[1] Univ Fed Uberlandia, Inst Quim, BR-2121 Uberlandia, MG, Brazil

关键词: Batch-injection analysis;    Multiple-pulse amperometry;    Biodiesel;    Antioxidants;    Simultaneous determination;   

DOI  :  10.1016/j.talanta.2012.06.024

来源: Elsevier

【 摘 要 】

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. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free