||Capability of GC/FT-IR to Identify Toxic Substances in Environmental Sample Extracts.
Gurka, D. F. ;
Laska, P. R. ;
Titus, R. ;
||Environmental Monitoring Systems Lab., Las Vegas, NV. ;Nevada Univ., Las Vegas. Dept. of Chemistry.
Environmental surveys ;
Gas chromatography ;
Chemical analysis ;
Infrared spectroscopy ;
Search structuring ;
Information systems ;
Toxic substances ;
Fourier transform spectroscopy ;
Computer aided analysis ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The minimum identifiable quantities of 55 toxic substances have been determined by packed column gas chromatography/Fourier transform infrared spectroscopy (GC/FT-IR) at conditions compatible with environmental extract analysis. Identification of each GC effluent component was accomplished with an IR reconstructed chromatogram, subsequent interferogram transformation, and on-line library search. GC/FT-IR exhibited its greatest sensitivity to aliphatic and aromatic organic compounds containing carbonyl or other oxygenated functional groups and its poorest sensitivity to alkyl halides and aromatic hydrocarbons. GC/FT-IR sensitivity was inversely proportional to the light pipe temperature. Extracts of the residue from a chemical plant still bottom were injected into the GC/FT-IR system, and the separated components were identified by utilizing an infrared reconstructed chromatogram (IRC) to locate interferogram files of high signal-to-noise ratio. Deconvolution techniques were used to separate the contributions of co-eluting IRC peaks. Interferogram files were then co-added and transformed. An on-line library search of 2300 vapor-phase infrared spectra provided sufficient chemical functionality information to identify most of the extract components.
||Prepared in cooperation with Nevada Univ., Las Vegas. Dept. of Chemistry.
||Pub. in Jnl. of Chromatographic Science, v20 p145-154 Apr 82.
|NTIS Title Notes
||Reprint: Capability of GC/FT-IR to Identify Toxic Substances in Environmental Sample Extracts.
|PUB Date Free Form
||7D; 5B; 68; 99A; 88B
||Not available NTIS