Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Comparison of a Cryogenic Preconcentration Technique and Direct Injection for the Gas Chromatographic Analysis of Low PPB (Parts-per-Billion) (NMOL/MOL) Gas Standards of Toxic Organic Compounds.
Author Rhoderick, G. C. ;
CORP Author National Bureau of Standards (NML), Gaithersburg, MD. Gas and Particulate Science Div.;Environmental Protection Agency, Washington, DC.
Publisher 1988
Year Published 1988
Stock Number PB89-173843
Additional Subjects Gas analyses ; Gas chromatography ; Halogen organic compounds ; Performance evaluation ; Cryogenics ; Emission spectroscopy ; Air pollution detection ; Volatile organic compounds ; Toxic substances ; Standard reference materials ; Environmental monitoring ; Electron capture detectors ; Flame ionization
Library Call Number Additional Info Location Last
NTIS  PB89-173843 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 08/24/1989
Collation 6p
There is an increasing need for multicomponent gas standards containing volatile toxic organic compounds at the low parts-per-billion level for use in environmental monitoring programs. Standards containing many organic compounds, both halogenated and nonhalogenated species within the same mixture, can be very difficult to analyze at the 1-15 ppb concentration level. Analyses of low level multicomponent mixtures have been done using several different techniques. Gas chromatography has been used to separate compounds in simple and complex mixtures. Original work was done using packed columns with a flame-ionization detector (FID) and large sample volumes, 10 mL and an electron-capture detector (ECD) to analyze for halogenated compounds at low ppb levels. Therefore, to measure all the compounds in a single analysis, a cryogenic preconcentration technique was developed to increase the sensitivity of both types of compounds to the FID. Temperature programming was coupled with this cryogenic preconcentration technique to increase the quality of baseline separations.