• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Electroanalysis >Simultaneous determination of quinoline and pyridine compounds in gasoline and diesel by differential pulse voltammetry
【24h】

Simultaneous determination of quinoline and pyridine compounds in gasoline and diesel by differential pulse voltammetry

机译：差分脉冲伏安法同时测定汽油和柴油中喹啉和吡啶化合物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The presence of trace basic organonitrogen compounds such as quinoline and pyridine in derivative petroleum fuels plays an important role in maintaining the engines of vehicles. However, these substances can contaminate the environment and so must be controlled because most of them are potentially carcinogenic and mutagenic. For these reasons, a reliable and sensitive method was developed for the determination of basic nitrogen compounds in fuel samples such as gasoline and diesel. This method utilizes preconcentration on an ion-exchange resin (Amberlyte IR - 120 H) followed by differential pulse voltammetry (DPV) on a glassy carbon electrode. The electrochemical behavior of quinoline and pyridine as studied by cyclic voltammetry (CV) suggests that their reduction occurs via a reversible electron transfer followed by an irreversible chemical reaction. Very well resolved diffusion-controlled voltammetric peaks were obtained in dimethylformamide (DMF) with tetrabutylammonium tetrafluoroborate (TBAF(4) 0.1 mol L-1) for quinoline (-1.95 V) and pyridine (-2.52 V) vs. Ag vertical bar AgCl vertical bar KClsat reference electrode. The proposed DPV method displayed a good linear response from 0.10 to 300 mg L-1 and a limit of detection (LOD) of 5.05 and 0.25 mu g L-1 for quinoline and pyridine, respectively. Using the method of standard additions, the simultaneous determination of quinoline and pyridine in gasoline samples yielded 25.0 +/- 0.3 and 33.0 +/- 0.7 mg L-1 and in diesel samples yielded 80.3 +/- 0.2 and 131 +/- 0.4 mg L-1, respectively. Spike recoveries were 94.4 +/- 0.3% and 10 +/- 0.5% for quinoline and pyridine, respectively, in the fuel determinations. This proposed method was also compared with UV-vis spectrophotometric measurements. Results obtained for the two methods agreed well based on F and t student's tests.
机译：衍生石油燃料中痕量碱性有机氮化合物（如喹啉和吡啶）的存在在维护车辆发动机方面起着重要作用。但是，这些物质会污染环境，因此必须加以控制，因为其中大多数可能具有致癌性和致突变性。由于这些原因，开发了一种可靠而灵敏的方法来测定汽油和柴油等燃料样品中的碱性氮化合物。该方法利用在离子交换树脂（Amberlyte IR-120 H）上的预浓缩，然后在玻璃碳电极上进行差分脉冲伏安法（DPV）。通过循环伏安法（CV）研究的喹啉和吡啶的电化学行为表明，它们的还原是通过可逆的电子转移然后发生不可逆的化学反应而发生的。在二甲基甲酰胺（DMF）和四氟硼酸四丁基铵（TBAF（4）0.1 mol L-1）中，喹啉（-1.95 V）和吡啶（-2.52 V）相对于Ag垂直条AgCl垂直获得了很好分辨的扩散控制伏安峰bar KClsat参比电极。提出的DPV方法在0.10至300 mg L-1范围内显示出良好的线性响应，对喹啉和吡啶的检出限（LOD）分别为5.05和0.25μg L-1。使用标准添加方法，同时测定汽油样品中的喹啉和吡啶可得到25.0 +/- 0.3和33.0 +/- 0.7 mg L-1，而柴油样品中可得到80.3 +/- 0.2和131 +/- 0.4 mg L-1。在燃料测定中，喹啉和吡啶的加标回收率分别为94.4 +/- 0.3％和10 +/- 0.5％。将该方法与紫外可见分光光度法进行了比较。根据F和t学生的检验，两种方法获得的结果非常吻合。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号