摘要:

Pyrolysis gas chromatography (PGC) is an indirect method of investigation in which the sample is pyrolyzed, the resulting volatile products are analyzed by gas chromatógraphy (GC), and the substance under investigation is characterized on the basis of GC of the volatile products of its pyrolysis. By qualitative and quantitative analysis of the products formed in the pyrolysis of the sample, one can determine the structure and composition of the system under study. Unlike other chemical methods widely used in PGC, pyrolysis is a complex reaction normally proceeding in many directions and involving many stages. Nevertheless, despite these difficulties, the resulting products are adequately representative of the composition and structure of the pyrolyzed samples, which is precisely what makes PGC a valuable method and provides for its development.

ISSN:0007-8980    

DOI:10.1080/10408348108542705

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

During the past decade, integrated gas chromatography-mass spectrometry (GCMS) has become recognized as one of the most versatile and powerful tools in analytical chemistry. The ultimate strength of this technique resides with the unique capability to separate and simultaneously identify the individual components of even the most complex mixture. Sufficient sample volatility is a prerequisite of a successful GCMS analysis. Although this is a serious limitation of the method, GCMS does span an impressive volatility range. An effective identification and a reliable quantitation of a trace component within a complex mixture is largely dependent on the capability of separation. Highly efficient and inert capillary columns and direct sample injectors for these columns are now commercially available, and these have improved sensitivity and reproducibility due to narrower peak profiles and reduced column bleed. Alternatively, short capillary columns can serve extremely well in applications where lesser number of plates are sufficient or where the separation of higher boiling components is desired. A review of the current "state of the art" shows that significant progress continues to be made each year and that many of the new applications of the technique originate from improved instrumentation. The instrumental innovations include: positive and negative ion chemical ionization sources, interfaces for high-resolution glass columns, automated data handling and library searching facilities, and multiple ion detection capabilities.

ISSN:0007-8980    

DOI:10.1080/10408348108542706

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor