一个EI&CI双电离TOFMS的性能评估与一个流量调节GC×GC系统混合
Steffen Bräkling1, Marleen Vetter1, Ralf Kurtenbach2
1TOFWERK, 3645 Thun, Switzerland.
Journal of the American Society for Mass Spectrometry
|July 22, 2024
概括
这项研究引入了一种新的双离子化飞行时间质谱仪 (TOFMS),用于全面的二维气体染色学 (GC×GC). 该系统可以在电子电离 (EI) 和化学电离 (CI) 之间快速切换,以加强交通排放分析.
科学领域:
- 分析化学 分析化学
- 质谱测量质量谱测量
- 染色体学 染色体学 是一种染色体学.
背景情况:
- 二维气体染色学 (GC×GC) 与质谱学 (MS) 结合,是复杂混合物分析的强大技术.
- 优化MS性能,包括电离技术和获取速度,对于有效的GC×GC连线是至关重要的.
研究的目的:
- 评估双电离TOFMS (EI和CI源) 与GC×GC的性能和兼容性.
- 调查GC×GC-MS串联的关键性能指标,包括获取速度,离子源响应和EI/CI切换能力.
- 展示开发的系统用于分析现实世界样本的应用,例如交通排放.
主要方法:
- 一个新的双电离TOFMS系统与并行EI和CI源被开发和合到一个GC×GC系统.
- 快速切换离子光学能够在EI和CI频谱之间进行100Hz的切换.
- 通过调查采集速度,离子源响应,GC传输效率和数据对齐来评估系统的性能.
- 将 Spectra 的质量与标准单四极 MS 设置进行了比较.
- 使用高流量比来提高CI的灵敏度.
主要成果:
- 双电离 TOFMS 证明了 GC×GC 的有效连接,具有 100 Hz 的快速 EI/CI 切换.
- 通过优化与CI源的流量比率,可以显著提高CI灵敏度 (高达37倍).
- 保持了Spectra质量,同时实现了高采集速度,这对GC×GC至关重要.
- 该系统成功分析了交通排放样本的热溶解GC×GC-EI&CI-TOFMS.
结论:
- 开发的双电离TOFMS与GC×GC高度兼容,提供增强的灵敏度和EI和CI模式之间的快速切换.
- 这种先进的分析系统提供了一个强大的平台,用于详细描述交通排放等复杂样本.
- 这些发现凸显了平行EI/CI TOFMS在环境监测和其他领域进行全面和敏感分析的潜力.
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