Universidade Federal de Uberlândia Instituto de Química, Av. João Naves de Ávila, Bloco 1D 38.400-902 2121, Uberlândia, MG, Brazil.
Talanta. 2012 Sep 15;99:527-31. doi: 10.1016/j.talanta.2012.06.024. Epub 2012 Jun 20.
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) HClO(4) (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.
我们报道了一种使用批量注射分析（BIA）结合脉冲安培法同时测定生物柴油中丁基羟基茴香醚（BHA）和叔丁基对苯二酚（TBHQ）的电流测定法。为了在单个注射步骤中在玻碳电极上分别检测 TBHQ 和 BHA，我们选择了一系列电位脉冲。在使用电子移液器注射之前，将样品用 50%（体积分数）v/v 的氢乙醇溶液在 0.1 mol L(-1) HClO(4)（支持电解质）中稀释。该方法具有很高的精度（RSD<1%，n=10）、快速（170 次注射 h(-1)）、准确（回收率在 100%到 110%之间）、检测限低（BHA 和 TBHQ 的检测限分别为 73 和 75 nmol L(-1)），并且可以很容易地适应现场测定。
