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RECORD NUMBER: 210 OF 224

OLS Field Name OLS Field Data
Main Title Thermally modulated electron affinity detector for priority pollutant analysis /
Author Hanisch, R. C. ; Ogle, L. D. ; Jones, A. E. ; Hall, R. C.
Other Authors
Author Title of a Work
Hanisch, R. C.
CORP Author Radian Corp., Austin, TX.;Environmental Monitoring and Support Lab.- Cincinnati, OH.
Publisher GPO,
Year Published 1985
Report Number EPA-68-03-2965; EPA/600/4-85/009
Stock Number PB85-158145
Subjects Contamination (Technology) ; Gas chromatography. ; Pesticides--Measurement. ; Polychlorinated biphenyls.
Additional Subjects Pesticides ; Gas chromatography ; Trace elements ; Chemical analysis ; Chlorine organic compounds ; Sampling ; Thermally modulated electron affinity detectors ; Polychlorinated biphenyls ; Polychlorinated dibenzodioxins ; Polychlorinated dibenzofurans
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB85-158145 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 57 pages : illustrations ; 28 cm
Abstract
In the area of environmental monitoring, a need exists for a rapid, sensitive, and selective method to analyze for chlorinated organic compounds such as pesticides, PCB, PCDD, and PCDF at trace levels in complex samples. In response to this need, a program was conducted to determine the feasibility of using a new detector concept in the gas chromatographic analysis of certain priority pollutants. The concept is based on the thermal alteration of a compound's electron affinity in a flow-through reactor, which can be used to modify the selectivity and sensitivity of the ECD to certain compounds. The TM ECD consists of two ECDs connected by a temperature-controlled reactor. Different classes of organic compounds respond to the reactor conditions in different ways: some compounds exhibit an enhanced ECD response after passing through the reactor; others a diminished signal; and still others no change in the magnitude of the signal. The ratio of a compound's response from the post-reactor ECD to that obtained from the prereactor ECD appears to be a property characteristic of each compound. This peak area ratio can be used in conjunction with its retention time to increase the confidence level of the identity of a given compound while still taking advantage of the excellent sensitivity characteristics of the ECD.
Notes
"Final report." "Jan. 1985." "EPA-600/4-85-009." Microfiche.