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

被引：80
作者：
Tormin, Thiago F. [1 ]
Cunha, Rafael R. [1 ]
Richter, Eduardo M. [1 ]
Munoz, Rodrigo A. A. [1 ]
机构：
[1] Univ Fed Uberlandia, Inst Quim, BR-2121 Uberlandia, MG, Brazil
来源：
TALANTA | 2012年 / 99卷
关键词：
Batch-injection analysis; Multiple-pulse amperometry; Biodiesel; Antioxidants; Simultaneous determination; FLOW-INJECTION; TERT-BUTYLHYDROQUINONE; BUTYLATED HYDROXYANISOLE; STORAGE STABILITY; OIL; ELECTROANALYSIS; PARACETAMOL; COPPER;
D O I：
10.1016/j.talanta.2012.06.024
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
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.
引用
收藏
页码：527 / 531
页数：5
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