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Laser desorption - Membrane introduction mass spectrometry

机译:激光解吸-膜导入质谱

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In this paper we describe the first use of laser desorption in conjunction with membrane introduction mass spectrometry (MIMS). In this technique, a low-powered carbon dioxide laser is used to irradiate the low-pressure (vacuum) side of a silicone membrane during a typical MIMS analysis of an aqueous solution. The absorption of laser energy results in direct membrane heating and rapid desorption of permeate molecules. This improves both the sensitivity and response times of MIMS when analyzing compounds having high molecular weight and low volatility. Two simple interfaces are described for performing laser desorption inside and outside the vacuum manifold of a GCQ ion trap mass spectrometer. Together with now injection (FI) sample introduction, we demonstrate direct on-line monitoring of;aqueous Solutions of high boding point (200-530 degrees C) polynuclear aromatic hydrocarbons such as naphthalene, anthracene, pyrene, benzo[b]fluoranthene, and indeno[123-cd]pyrene. [References: 53]
机译:在本文中,我们描述了激光解吸与膜导入质谱(MIMS)结合的首次使用。在该技术中,在水溶液的典型MIMS分析过程中,使用低功率的二氧化碳激光照射硅膜的低压(真空)侧。激光能量的吸收导致直接的膜加热和渗透物分子的快速解吸。当分析具有高分子量和低挥发性的化合物时,这可以提高MIMS的灵敏度和响应时间。描述了两个简单的界面,用于在GCQ离子阱质谱仪的真空歧管内部和外部执行激光解吸。结合现在的进样(FI)样品引入,我们展示了对具有高结合点(200-530摄氏度)的多核芳烃如萘,蒽,pyr,苯并[b]荧蒽和茚并[123-cd] py。 [参考:53]

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