Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Automated measurements of infrared spectra of chromatographically separated fractions /
Author Griffiths, Peter R.,
CORP Author Ohio Univ., Athens. Dept. of Chemistry.;Environmental Research Lab., Athens, GA.
Publisher Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency ; Available to the public through the National Technical Information Service,
Year Published 1979
Report Number EPA-600/4-79-064; EPA-R-804333-01
Stock Number PB80-122575
OCLC Number 07182948
Subjects Infrared spectroscopy. ; Gas chromatography. ; Liquid chromatography. ; Organic water pollutants. ; Water Pollutants--analysis. ; Spectrophotometry, Infrared--methods. ; Water--Analysis ; Gas chromatography--Industrial applications
Additional Subjects Infrared spectroscopy ; Gas chromatography ; Water analysis ; Performance evaluation ; Liquid chromatography ; Laboratory equipment ; Samples ; Optical equipment ; Thin layer chromatography ; Gas analysis ; Separation ; Water pollution ; Fourier transform spectroscopy ; Water pollution detection
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-4-79-064 Headquarters Library/Washington,DC 04/10/2014
EJBD  EPA 600-4-79-064 c.1 Headquarters Library/Washington,DC 05/02/2014
EKBD  EPA-600/4-79-064 Research Triangle Park Library/RTP, NC 09/05/2003
ESAD  EPA 600-4-79-064 Region 10 Library/Seattle,WA 04/22/2005
NTIS  PB80-122575 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation xi, 68 p. : ill. ; 28 cm.
The rapid identification of trace organic pollutants in water presents one of the more severe problems for environmental analytical chemists today. Spectroscopic identifications of chromatographically separated fractions, preferably without trapping each sample, yields more certain identification of each peak. To optimize the sensitivity of infrared measurements of gas chromatographic effluents, the optimal dimensions for the light-pipe gas cells were first calculated. The transmittance of light-pipes with these optimized dimensions is so high that the signal-to-noise ratio of the single-beam interferograms measured using a mercury cadmium telluride photodetector is limited by digitization noise. To get around this problem, the application of dual-beam Fourier transform infrared spectroscopy was tested and the sensitivity of measurements was four times greater than the single beam measurement. Detection limits of less than 1 ppb were observed when this system was applied to trace organics in water. SCOT columns and shorter light pipes were expected to produce detection limits below 10 ng. The application of dual-beam FT-IR spectroscopy to the online indentification of peaks eluting from a high performance liquid chromatograph was investigated. Typical detection limits in excess of 10 micro g were found, which are too great for general analytical work. Spectra of submicrogram quantities were measured in preliminary work with a system based on diffuse reflectance measurements of deposited solutes on KCl powder. The sensitivity of techniques for the in situ identification of species on specially prepared thin-layer chromatographic plates was improved by the application of programmed multiple development. Detection limits of 100 ng could be achieved in less than 5 seconds data acquisition time, and limits of 10 ng could be achieved after extended signal-averaging.
"Ohio University." "Analytical Chemistry Branch, Environmental Research Laboratory." "October 1979." Includes bibliographical references. "Grant no. R804333-01."