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首页> 外文期刊>Analytical Communications >Polyetherimide-silicone: a 10 mu m ultrathin composite membrane for faster and more sensitive membrane introduction mass spectrometry analysis
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Polyetherimide-silicone: a 10 mu m ultrathin composite membrane for faster and more sensitive membrane introduction mass spectrometry analysis

机译:聚醚酰亚胺-硅酮:10微米超薄复合膜,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. [References: 27]
机译:发现具有10微米厚的交联有机硅层的聚醚酰亚胺(聚酯)/有机硅(PEI / S)片状复合膜具有所需的机械性能,可有效地用作膜引入质谱法中的溶液/高真空界面( MIMS)分析水中的挥发性有机化合物(VOC)。由于响应和恢复时间短得多,因此与MIMS中通常使用的250微米硅树脂膜相比,PEI / S膜的分析和校准程序要快得多。当使用EI时,由于过多的水渗透,响应(信号强度) PEI / S膜的性能并不总是优于分析物,而是依赖于分析物。然而,对于极性更大的挥发性有机化合物,PEI / S膜的响应性要高2-3倍,从而改善了其相对较差的MIMS检测限。应用电离作用后,过度的水渗透问题得到了缓解,PEI / S膜显示出优异的响应性。 [参考:27]

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