Fourier Transform-infrared Chromatographic solutions

Instrumentation. Almost every imaginable type of gas detector or analyzer has been utilized in EGA, including hygrometers, nondispersive infrared analyzers, and gas chromatographs. Absorption of the products into solution permits analysis by coulometry, colorimetry, ion selective electrode measurements, or titrimetry. The most important analyzers are Fourier transform infrared (FTIR) spectrometers and, preeminently, mass spectrometers [19J. The two latter methods can be used to record spectra repetitively, thereby producing a lime-dependent record of the composition of the gas phase, from which EGA curves can be constructed for selected species. 

Chromatographic techniques (Section D) are used for the separation of multi-component mixtures. However, identification of the separated solutes by their retention times alone is often ambiguous. Infrared spectrometry (Topics ElO and Ell) is a very powerful and versatile technique for the identification of functional groups. The newer instruments, using computerized Fourier transform (FT) processing of spectral information, are readily interfaced with gas chromatographs using heated transfer lines and gas cells which facilitate the rapid detection and identification of unknown compounds. 

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