Determination of non- and mono-ortho polychlorinated Biphenyls in background ambient air
Bepaling van non en mono-ortho gechloreerde biphenylen in achtergrond buitenlucht
Lopez Garcia A , Boer AC den , Jong APJM de
RIVM Report 502501032
An analytical procedure has been developed for the isomer specific determination of polychlorinated biphenyls in background ambient air. The methodology uses Carbosphere� activated carbon and isotope dilution HRGC/MS for the isolation and analysis of the toxic fraction of PCBs in the presence of all other, less or non-toxic congeners. This toxic fraction includes the non-ortho and mono-ortho PCBs, which recently were assigned by a WHO/IPCS expert group on toxicity as being the most toxic congeners. The method provides quantification limits ranging from 0.01 to 0.08 pg/m3. Mean atmospheric levels for the sum of these congeners varied between 3.0 and 5.0 pg/m3 with some events with higher concentrations. PCB 126 typically present at 0.03 pg/m3 was found to contribute for 77 % of the total toxic equivalent (TEQ) values in air samples.