Using Square Wave Voltammetry on Ultramicroelectrodes To Determine Synthetic Antioxidants in Vegetable Oils
Using Square Wave Voltammetry on Ultramicroelectrodes To Determine Synthetic Antioxidants in Vegetable Oils
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DOI：
10.1021/ed083p1349
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发表时间：
2006-09
影响因子：
3
通讯作者：
C. Ceballos;M. Zón;H. Fernández
中科院分区：
文献类型：
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作者：
C. Ceballos;M. Zón;H. Fernández
结合化学萃取，标准加入法，和电分析技术的基本概念的实验报告。使用添加到商业植物油样品中的合成抗氧化剂（叔丁基羟基甲苯，BHT）的测定来进行实验室实验。在几个连续步骤中使用非水溶剂（乙腈，ACN）提取BHT。在碳纤维超微电极（UME）上通过方波伏安法（SWV）进行其定量。该分析基于标准加入法，对从0.1 M H2SO 4/ACN反应介质中的浸提液中获得的样品进行分析。学生获得经验，在不同方面的实验化学工作的一个真实的矩阵。本实验是一个适合于化学仪器类课程的本科化学仪器实验。
An experiment that combines essential concepts of chemical extraction, the standard-addition method, and electroanalytical techniques is reported. The determination of a synthetic antioxidant (t-butylhydroxytoluene, BHT) added to a commercial vegetable oil sample is used to perform the laboratory experiment. BHT is extracted with a nonaqueous solvent (acetonitrile, ACN) in several successive steps. Its quantification is performed by square wave voltammetry (SWV) at a carbon fiber ultramicroelectrode (UME). The analysis is based on the standard-addition method on samples obtained from extract solutions in the 0.1 M H2SO4/ACN reaction medium. Students obtain experience in different aspects of experimental chemistry working on a real matrix. This undergraduate chemical instrumental experiment is appropriate for a course on chemical instrumentation.