||Thermally modulated electron affinity detector for priority pollutant analysis /
Hanisch, R. C. ;
Ogle, L. D. ;
Jones, A. E. ;
Hall, R. C.
||Radian Corp., Austin, TX.;Environmental Monitoring and Support Lab.- Cincinnati, OH.
Contamination (Technology) ;
Gas chromatography. ;
Gas chromatography ;
Trace elements ;
Chemical analysis ;
Chlorine organic compounds ;
Thermally modulated electron affinity detectors ;
Polychlorinated biphenyls ;
Polychlorinated dibenzodioxins ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||57 pages : illustrations ; 28 cm
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.
"Final report." "Jan. 1985." "EPA-600/4-85-009." Microfiche.