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ENANTIOMERIC RATIOS OF CHIRAL PCB ATROPISOMERS IN RADIODATED SEDIMENT CORES
Citation:
Garrison, A W., C S. Wong, U. Pakdeesusuk, C. M. Lee, J. T. Coates, AND A. W. Elzerman. ENANTIOMERIC RATIOS OF CHIRAL PCB ATROPISOMERS IN RADIODATED SEDIMENT CORES. Presented at 20th Annual Society of Environmental Toxicology and Chemistry Meeting, Philadelphia, PA, November 14-18, 1999.
Description:
Enantiomeric ratios (ERs)) of chiral polychlorinated biphenyl (PCB) atropisomers were quantified in radiodated sediment cores of Lake Hartwell SC, a reservoir heavily impacted by PCBS, to study spatial and temporal changes in chirality. A chiral analysis of cores showed accumulation of PCBs with depth in sediments consistent with the use history and contamination in Lake Hartwell, suggesting from changes in congener patterns and increasing concentration of ortho-only congeners, end-products of meta- and para-dechlorination, that reductive dechlorination was occurring in situ in sediments. Chiral analysis showed enantioselective occurrence of some PCB atropisomers with depth, indicating that the reductive dechlorination processes in Lake Hartwell are stereospecific, and suggesting that changes in ER with depth can be a chronological tracer in sediments.