||Use of the 'Ortho Effect' for Chlorinated Biphenyl and Brominated Biphenyl Isomer Identification.
Sovocool, G. W. ;
Mitchum, R. K. ;
Donnelly, J. R. ;
||Lockheed Engineering and Management Services Co., Inc., Las Vegas, NV.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Spectrum analysis ;
Mass spectroscopy ;
Gas chromatography ;
Polybromobiphenyl compounds ;
Polychlorobiphenyl compounds ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The ortho effect observed for chlorinated biphenyls (PCBs) and brominated biphenyls (PBBs) having 2,2; 2,2', 6 or 2,2', 6,6' halogens, can be combined with GC retention index for isomer specific identifications by gas chromatography/mass spectrometry (GC/MS). This technique reliably allows accurate structure assignments for environmental monitoring without the use of multiple GC determinations that employ different chromatographic phases. Validation of the ortho effect for 129 PCBs and PBBs is reported, including a survey of all PCB mass spectra in the EPA/NIH mass spectral database. Presence or absence of ortho effect and reduction in magnitude for 2,2', 6,6' substitution may be related to the formation of a planar, bridged halonium ion intermediate upon electron ionization in the mass spectrometer. (Copyright (c) by John Wiley & Sons, Ltd.)
||Pub. in Biomedical and Environmental Mass Spectrometry, v14 p579 1987. Sponsored by Environmental Monitoring Systems Lab., Las Vegas, NV.
|NTIS Title Notes
||Reprint: Use of the 'Ortho Effect' for Chlorinated Biphenyl and Brominated Biphenyl Isomer Identification.
|PUB Date Free Form
||PC A02/MF A01