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MessagePosté le: Sam 3 Sep - 09:42 (2016)    Sujet du message: Gc Ms Interfaces Pdf Download Répondre en citant

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Gc Ms Interfaces Pdf Download

Ionization occurs under vacuum conditions either by electron ionization or by chemical ionization [1]. Please refer to this blog post for more information. On the other hand, ionization in LC/MS typically occurs at atmospheric pressure and the ions are swept into the vacuum system through differentially pumped regions separated by apertures or capillaries [4]. Because ionization in GC/MS occurs under vacuum conditions and in LC/MS occurs at atmospheric pressure, the two separation methods require entirely different interfaces to the mass spectrometer and are thus usually performed on instruments dedicated to the particular chromatography method.However, GC/MS can also be achieved under atmospheric pressure ionization conditions. For some analyses, the limitation related to ionization of highly nonpolar compounds is advantageous, as is the simplified mass spectrum and easy molecular weight identification that results from less fragmentation observed in the AP ionization mode.Gas chromatography interfaced to mass spectrometry (GC/MS) is a well established and powerful method for the analysis of volatile and semi-volatile materials [1]. This page uses JavaScript to progressively load the article content as a user scrolls.

View full text Journal of the American Society for Mass SpectrometryVolume 16, Issue 11, November 2005, Pages 17301738 ArticleA Combination Atmospheric Pressure LC/MS:GC/MS Ion Source: Advantages of Dual AP-LC/MS:GC/MS Instrumentation Charles N. Please enable JavaScript to use all the features on this page. A timely example is metabolomics analysis [3].The effluent from the GC is introduced into the vacuum of the mass spectrometer either directly from capillary fused silica columns or after a differential pumping stage for higher gas load columns. Advantages of this additional capability versus LC/MS alone include higher chromatographic resolution in the GC versus LC mode, greater peak capacity for complex mixture analysis, higher sensitivity for a variety of volatile compounds, and the ability to observe compounds of low polarity that are not readily observed in LC/MS. Horning et al. These advantages are especially important in the study of complex mixtures. Related book content No articles found. Download PDF Opens in a new window. However, the primary use of this ionization method has been as an ionization interface between liquid chromatography and mass spectrometry [11].In recent years, atmospheric pressure mass spectrometers have proliferated, primarily because of electrospray ionization and the ease of interfacing this atmospheric pressure ionization method to liquid chromatographs [5].

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