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Polyetherimide–silicone: a 10 μm ultrathin composite membrane for faster and more sensitive membrane introduction mass spectrometry analysis

机译:聚醚酰亚胺 - 硅氧烷:10μm超薄复合膜,用于更快,更灵敏的膜引入质谱分析

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摘要

A polyetherimide (polyester)/silicone (PEI/S) sheet composite membrane with a 10 mu m thick cross-linked silicone layer is found to display the required mechanical properties to work efficiently as the solution/high vacuum interface in membrane introduction mass spectrometry (MIMS) analysis of volatile organic compounds (VOC) in water. Owing to much shorter response and recovery times, the PEI/S membrane allows much faster analysis and calibration procedures as compared to the 250 mu m silicone membrane usually used in MIMS, When using EI, owing to excessive water permeation, responses (signal intensity) for the PEI/S membrane are not always superior, being analyte-dependent, For the more polar VOCs, however, the PEI/S membrane shows 2-3 times greater responses, improving their relatively poor MIMS detection limits, When water-methane chemical ionization is applied, the problem of excessive water permeation is attenuated, and the PEI/S membrane displays greatly superior responses.
机译:聚醚酰亚胺(聚酯)/硅(PEI / S)片复合膜具有10微米厚的交联的有机硅层被发现有效地作为溶液/高真空在膜引入质谱法(界面以显示所需的机械性能,以工作在水中的挥发性有机化合物(VOC)的MIMS)分析。由于短得多的响应和恢复时间,所述PEI / S膜允许相比于250微米的硅膜一般在MIMS使用的,当使用EI,由于过量的水渗透快得多分析和校准程序,响应(信号强度)对于PEI / S隔膜并不总是优越,被分析物的依赖,对于更极性的挥发性有机化合物,然而,PEI / S隔膜节目的2-3倍有较大的反应,提高他们的相对贫困MIMS检出限,当水,甲烷的化学电离被施加过多的水渗透的问题被衰减,并且PEI / S膜显示器大大优于响应。

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