MA6 Environmental Chemistry and Toxicology of Chiral Pollutants
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() Chiral signature of PCBs and organochlorine pesticides along an urban-rural transect.

Wong, F1, Diamond, M2, Robson, M3, Harrad, S3, Bidleman, T4, Truong, J2, 1 Meteorological Service of Canada, Downsview, ON, Canada2 University of Toronto, ON, Canada3 University of Birmingham, UK4 Centre for Atmospheric Research Experiment, Egbert, ON, Canada

ABSTRACT- Enantioselective degradation of chiral PCBs and organochlorine pesticides along an urban-rural transect was investigated in this study. Forest soils collected at the Toronto urban-rural transect showed enantioselective degradation of PCB 95 and 136, while PCB 149 does not indicate appreciable enantioselective degradation. Enantiomeric fractions (EFs) of chlordane showed preferential degradation of the (−) enantiomer of the cis-chlordane and the (+) enantiomer of the trans-chlordane, which is similar to the degradation pattern in agricultural soils. EFs of o,p'DDT showed no preferential degradation. EFs were expressed as deviation from racemic value of 0.500 (DFR). An inverse relationship was observed when DFR of PCB 149 is plotted against total PCB and PAH concentrations. Similar results were seen in the UK lake sediments, where the enantioselective degradation of PCB 149 seems to be inhibited by the high concentrations of PAH. These observations suggested that there maybe less microbial degradation in the more contaminated urban than rural soils.

Key words: PCB, chiral, pesticides, urban-rural

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