Citation:

Osemwengie, L. Combined GC and MS “Ortho Effects” Studied for 209 PCB Congeners: An Additional Tool for Accurate Structural Assignment of PCBs. 2020 SETAC North America Annual Meeting, Virtual, November 15 - 19, 2020.

Impact/Purpose:

Commercially available standards provided an opportunity to test all 209 PCB congeners for the mass spectrometric “ortho effect,” or the enhancement of the [M-Cl]+ ion abundance, relative to the molecular ion for biphenyls having 2,2'-; 2,2',6-; and to a smaller degree, 2,2',6,6'- chlorine substitution. This study also verified that much smaller “ortho effects” were observed for PCBs lacking any, or one ortho chlorine (2-), or two ortho chlorines on the same ring (2,6-). Chromatographic studies using a 40 meter, Rtx-PCB chromatographic column, connected orthogonally with a 1-meter DB-17 column, yielded retention properties which showed previously recognized chromatographic ortho effects and ring substitution - retention order correlations. The order of elution was combined with the measured mass spectrometric “ortho effects” to test this premise as an additional tool to assist in the structural assignment of the PCB congeners.

Description:

Abstract presentation about the ortho effects on PCB analysis. The method using standards is described on the impact statement.

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