Main Title |
Capability of GC/FT-IR to Identify Toxic Substances in Environmental Sample Extracts. |
Author |
Gurka, D. F. ;
Laska, P. R. ;
Titus, R. ;
|
CORP Author |
Environmental Monitoring Systems Lab., Las Vegas, NV. ;Nevada Univ., Las Vegas. Dept. of Chemistry. |
Year Published |
1982 |
Report Number |
EPA/600/J-82/445; |
Stock Number |
PB85-219376 |
Additional Subjects |
Environmental surveys ;
Gas chromatography ;
Chemical analysis ;
Infrared spectroscopy ;
Extraction ;
Feasibility ;
Assessments ;
Search structuring ;
Information systems ;
Reprints ;
Toxic substances ;
Fourier transform spectroscopy ;
Computer aided analysis ;
Listings ;
Computer applications
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB85-219376 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
12p |
Abstract |
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. |