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Proceedings Paper

Gas Chromatography/Mass Spectroscopy/Infrared (GC/MS/IR) Analysis Using A SCOT GC Column, A Quadrupole MS, And A Fourier Transform Infrared Spectrometer (FTIR)
Author(s): R. Crawford; R. Sanborn; T. Hirschfeld; C. Wong; H. Brand
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Paper Abstract

A GC/MS has been interfaced to an FT-IR so that real time MS and IR spectra are recorded on the identical sample. After much effort at optimizing the match between the GC and the IR, it was found that a nearly optimum trade-off between resolution and sensitivity was obtained using a SCOT column. To preserve the CC resolution, a makeup gas flow was used with a standard light pipe to optimize flow rates and conditions in the FT-IR. Further steps in this optimization include small sized detectors and matched light pipes which are currently being prepared. The GC/MS and GC/IR are coupled in parallel by a constriction splitter operating in Mach limited flow, with about 90% of the sample going to the infrared system. Initially, the computer library search outputs of both systems were integrated manually, but the output from the separate HP21MX (GC/MS) and Nova 3 (FT-IR) mainframes is being gradually integrated for combined data processing. Further integration of GC retention times into the qualitative interpretation is being planned. The ternary GC/MS/IR hyphenated instrument has shown the following advantages over its binary ancestors: (1) Added resolvability of overlapping peaks, particularly those involving isomers. (2) Simpler end searches by comparing the hit lists from the IR and MS spectral searches. (3) Complementary structural information on samples where library searches were unsuccessful.

Paper Details

Date Published: 29 October 1981
PDF: 1 pages
Proc. SPIE 0289, 1981 Intl Conf on Fourier Transform Infrared Spectroscopy, (29 October 1981); doi: 10.1117/12.932156
Show Author Affiliations
R. Crawford, Lawrence Livermore National Laboratory (United States)
R. Sanborn, Lawrence Livermore National Laboratory (United States)
T. Hirschfeld, Lawrence Livermore National Laboratory (United States)
C. Wong, Lawrence Livermore National Laboratory (United States)
H. Brand, Lawrence Livermore National Laboratory (United States)

Published in SPIE Proceedings Vol. 0289:
1981 Intl Conf on Fourier Transform Infrared Spectroscopy
Hajime Sakai, Editor(s)

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