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Eur. J. Mass Spectrom. 1, 149 - 159 (1995)

Analysis of polychlorinated biphenyls by quadrupole ion trap mass spectrometry: Part I - Chemical ionization studies of co-eluting congeners 77 and 110

M. Lausevic, J.B. Plomley, X. Jiang and R.E. March*
Department of Chemistry, Trent University, Peterborough, ON, Canada K9J 7B8
C.D. Metcalfe
Environmental and Resource Studies Program, Trent University, Peterborough, ON, Canada K9J 7B8

ABSTRACT:
A quadrupole ion trap mass spectrometer coupled with a gas chromatograph was used to study the reactions of two co-eluting polychlorinated biphenyl (PCB) compounds, congener 77 (3,3',4,4' tetrachlorobiphenyl) and congener 110 (2,3,3',4',6-penta- chlorobiphenyl), with a variety of reagent cations. Analysis of these co-eluting PCB congeners illustrates the analytical challenges of determining concentrations of a toxic "co-planar" congener (77) in the presence of a co-eluting congener (110), which is less toxic than 77 but present in environmental samples at greater concentrations. The principal reactions observed with the quadrupole ion trap instrument operated in chemical ionization mode were protonation, charge exchange, fragmentation and adduct formation. The composite mass spectra obtained from the reaction of mass- selected reagent ions with the co-eluting PCBs were examined for possible analytical strategies, and the most promising method for determination of these congeners, and perhaps PCBs in general, appears to be chemical ionization with mass-selected C2H5+ions from methane.

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