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RECORD NUMBER: 33 OF 217

OLS Field Name OLS Field Data
Main Title Comparative analysis of dioxins and furans by electron impact, high resolution mass spectrometry and by electron capture, negative ionization, and low resolution mass spectrometry /
Author Koester, C. J. ; Harless, R. L. ; Hites, R. A.
CORP Author Indiana Univ. at Bloomington.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher Indiana University for US Environmental Protection Agency, Atmospheric Research and Exposure Assessment Laboratory,
Year Published 1990
Report Number EPA-R-812588; EPA/600/D-90/111
Stock Number PB90-263054
Subjects Dioxin. ; Furans.
Additional Subjects Chlorine aromatic compounds ; Mass spectroscopy ; Ionization ; Air pollution ; Molecular structure ; Hazardous materials ; Reprints ; Dioxins ; Health hazards ; Air sampling ; Trace contaminants
Holdings
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Status
NTIS  PB90-263054 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 4 pages ; 29 cm
Abstract
Electron impact, high resolution mass spectrometry (HRMS) is currently the method of choice for the analysis of polychlorinated dibenso-p-dioxins and dibenzofurans (PCDD/F) because of its ability to detect PCDD/F in the presence of interfering compounds, such as polychlorinated biphenyls (PCB), which cannot be resolved by low resolution methods. The PDCC/F analyses may also be performed using electron capture, negative ionization (ECNI) low resolution mass spectrometry, providing extensive sample preparation is done to remove interferences. Before ECNI low resolution mass spectrometry (MS) can be accepted as a routine method for PCDD/F analysis, it is necessary to show that results generated by this method are comparable to those obtained by HRMS. Known mixtures and unknown air samples were analyzed by electron impact HRMS (Finnigan MAT 90 system) and by ECNI low resolution MS (Hewlett Packard 5985B). Both instruments were fitted with a gas chromatographic inlet. The PCDD/F concentrations determined by the two techniques compare favorably, typically within 20%. The major difference between these two methods is that the ECNI low resolution method shows poor sensitivity in detecting 2,3,7,8-tetrachlorodioxin. However, ECNI MS offers the advantage of lower detection limits (50-100 fg) than electron impact HRMS (0.1 to 0.5 pg). These results suggest that ECNI low resolution MS can be a simple, low cost alternative to the common high resolution methods used for PCDD/F analysis.
Notes
"EPA 600/D-90/111." Microfiche.