All isomers of tetrachlorodibenzofuran (with the exception of 1,2,8,9 - TCDF) were unambiguously synthesized via the base-catalyzed cyclization of the appropriate hydroxy-PCB precursors. The standards were found to have a mean purity in excess of 94%. Chromatographic characterization of the TCDF's on a 30m DB5 column and a 60m SP2331 column showed excellent agreement with previous qualitative assignments. The current for TCDF molecular ions was found to maximize in the 60 - 70 eV range. Considerable variability in the mass spectrometric response factors for TCDF molecular ions relative to the 2,3,7,8 isomer has been demonstrated, with values ranging from 0.42 to 2.9.
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Health, Toxicology and Mutagenesis