| 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, |
| 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 |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| 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 |
| ELBD ARCHIVE |
EPA 600-4-79-064 |
Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
| ESAD |
EPA 600-4-79-064 |
|
Region 10 Library/Seattle,WA |
04/22/2005 |
| NTIS |
PB80-122575 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
xi, 68 pages : illustrations, figures ; 28 cm. |
| Abstract |
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. |
| Notes |
"October 1979." U.S. Environmental Protection Agency Grant No. Contract Number: R804333-01. Includes bibliographical references (pages 65-67) |
| Place Published |
Athens, Ga. Springfield, Va. |
| Access Notes |
Also issued online.; Also available via the World Wide Web |
| Corporate Au Added Ent |
Environmental Research Laboratory (Athens, Ga.). Analytical Chemistry Branch.; Ohio University.; United States. Environmental Protection Agency. Office of Research and Development. |
| Title Ser Add Ent |
Research reporting series. Environmental monitoring ; EPA-600/4-79-064. |
| PUB Date Free Form |
1979 |
| Series Title Traced |
Research reporting series Environmental monitoring ; EPA-600/4-79-064 |
| Series Title Untraced |
Research reporting series. 4, Environmental monitoring ; EPA-600/4-79-064 |
| NTIS Prices |
PC A05/MF A01 |
| BIB Level |
m |
| Cataloging Source |
OCLC/T |
| Merged OCLC records |
59226983; 1225687837 |
| OCLC Time Stamp |
20140409100257 |
| Language |
eng |
| SUDOCS Number |
EP 1.23/5:600/4-79-064 |
| Origin |
OCLC |
| Type |
MERGE |
| OCLC Rec Leader |
02758cam 2200553Ia 45020 |
