Functional Group Analysis of Interferometric Data from Gas Chromatography Fourier Transform Infrared Spectroscopy

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A method is presented for the direct analysis of interferometric data from gas chromatography Fourier transform infrared spectroscopy (GC/FTIR). A synthetic interferogram is initially produced which represents the characteristic absorption features of a particular functional group or compound class. A zero displacement correlation is performed between this test interferogram and each sample interferogram from the GC data. The presence of the desired functionality in the GC effluent is indicated by a small value of the resulting cumulative sum. A "correlogram" which emulates the response from a chemically specific GC detector is obtained by plotting the cumulative sum from each sample correlation. Synthetic interferograms representing infrared absorption bands which are truly specific for a particular functionality yield the best results.

Keywords: Chemically specific infrared detection; Gas chromatography Fourier transform infrared spectroscopy; Interferogram analysis

Document Type: Research Article


Affiliations: Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27514

Publication date: January 1, 1980

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