Contributions to the GC-MS-analysis of polyfluorinated dibenzo-p-dioxins (PFDD)

Polyfluorinated dibenzodioxins (PFDD) obtained by synthesis are investigated for their gas chromatographic and mass spectrometric behaviour. Kovats-indices of the investigated PFDD range between 1400 and 1600 on the unpolar column DB5, between 1500 and 1900 on the moderately polar column DB17 and between 2300 and 2800 on the strongly polar SP 2331. Thus PFDD elute between PFB and PCB. As for PCDD the molecular ion peak is the base peak for PFDD, too. However, other than for PCDD the second highest peak is the M-C(2)O(2)-peak for the lower fluorinated PFDD and the M-COF-peak for the higher fluorinated PFDD (directly followed by the M-C(2)O(2)-peak). PFDD also show intensive M(2+)-peaks. The intensity of C(x)F(y)-fragments increases with increasing degree of fluorination.