Gas chromatography-Fourier transform infrared GC-FTIR

EPA. 1986d. Capillary column analysis of semivolatile organic compounds by gas chromatography/Fourier transform infrared (GC/FTIR) spectrometry-method 8410. In Test methods for evaluating solid waste. SW-846. Washington, DC U.S. Environmental Protection Agency, Office of Solid Waste and Emergency... 

In the case of an unknown chemical, or where resonance overlap occurs, it may be necessary to call upon the full arsenal of NMR methods. To confirm a heteronuclear coupling, the normal H NMR spectrum is compared with 1H 19F and/or XH 31 P NMR spectra. After this, and, in particular, where a strong background is present, the various 2-D NMR spectra are recorded. Homonuclear chemical shift correlation experiments such as COSY and TOCSY (or some of their variants) provide information on coupled protons, even networks of protons (1), while the inverse detected heteronuclear correlation experiments such as HMQC and HMQC/TOCSY provide similar information but only for protons coupling to heteronuclei, for example, the pairs 1H-31P and - C. Although interpretation of these data provides abundant information on the molecular structure, the results obtained with other analytical or spectrometric techniques must be taken into account as well. The various methods of MS and gas chromatography/Fourier transform infrared (GC/FTIR) spectroscopy supply complementary information to fully resolve or confirm the structure. Unambiguous identification of an unknown chemical requires consistent results from all spectrometric techniques employed. 

Gas chromatography-Fourier transform infrared spectroscopy (gc-ftir)... 

GC/FTIR Gas Chromatography/Fourier Transform Infrared Spectroscopy... 

M.T. Soderstrom and R.A. Ketola, Identification of nerve agents and their homologues and dialkyl methylphosphonates by gas chromatography/Fourier transform infrared spectrometry (GC-FTIR), Part I Spectral identification, Frese-nius J. Anal. Chem., 350, 162-167 (1994). 

Budzinski H, Hermange Y, Pierard C, et al. 1992. Structural characterization of environmentally important compounds by gas chromatography/Fourier transform infrared spectroscopy (GC/FTIR) and gas chromatography/mass spectrometry (GC/MS). Analusis 20(3) 155-163. 

Analysis of trace compounds. All fractions were checked by capillary gas chromatography (GC) with FID and sulfiir specific detection (flame photometric detector, FPD ThermoQuest CE, Egelsbach). Subsequently the different fractions were analyzed by capillary gas chromatography-mass spectrometry (GC-MS). Specific unknowns were enriched by preparative multidimensional gas chromatography (MDGC). For further structure elucidation complementary analyses using GC-MS and capillary gas chromatography-Fourier transform infrared spectroscopy (GC-FTIR) as well as H-NMR were applied. All new compounds have been synthesized and characterized by GC-olfactometry (GC-0). 

GC-FTIR = Gas Chromatography-Fourier Transform InfraRed spectroscopy... 

C. Wurrey and D. Gurka, Environmental Applications of Gas Chromatography/Fourier Transform Infrared Spectroscopy (GC-FTIR), m Applications of FTIR Spectroscopy, Volume 18,. Durig, Ed., Elsevier, Amsterdam, 1990. 

Gas chromatography (GC) and with mass spectrometry (GC-MS) Fourier transform infrared spectroscopy (FTIR)... 

A few gas chromatography (GC) and liquid chromatography (LC) studies have been reported. Eor example, PCDDs have been separated on a 50m x 0.25 mm polar fused silica capillary GC column (CP Sil-88, Chrompack) with helium as carrier gas and Fourier transform infrared (FTIR)/MS detectors <1997ANC1113>. Furthermore, a highly sensitive and accurate GC-MS method for rapid quantitative analysis of 1,4-dioxane in water has been described <1997JCH(787)283>. 

Principal component analysis is most easily explained by showing its application on a familiar type of data. In this chapter we show the application of PCA to chromatographic-spectroscopic data. These data sets are the kind produced by so-called hyphenated methods such as gas chromatography (GC) or high-performance liquid chromatography (HPLC) coupled to a multivariate detector such as a mass spectrometer (MS), Fourier transform infrared spectrometer (FTIR), or UV/visible spectrometer. Examples of some common hyphenated methods include GC-MS, GC-FTIR, HPLC-UV/Vis, and HLPC-MS. In all these types of data sets, a response in one dimension (e.g., chromatographic separation) modulates the response of a detector (e.g., a spectrum) in a second dimension. 

Infrared (IR) techniques are reported in literature to be used in combination with different thermal experiments as a convenient tool of analysis. For example, IR-EGA (infrared evolved gas analysis) was used for obtaining information on different thermal and combustion processes [19]. A simple IR attachment where the sample can be pyrolyzed close to the IR beam is also commercially available (Pyroscan/IR from CDS Analytical). Although the IR detectors are by far not as popular as the MS, pyrolysis-gas chromatography/Fourier transform IR (Py-GC/FTIR) occasionally has been used in polymer analysis. Such applications have been commonly related to the analysis of certain gases such as CO2, CO, CH4, NH3, etc., where the MS analysis is less successful [20, 21]. 

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