Spatial Distribution, Air-Water Fugacity Ratios and Source Apportionment of Polychlorinated Biphenyls in the Lower Great Lakes Basin.
Polychlorinated biphenyls (PCBs) continue to be contaminants of concern across the Great Lakes. It is unclear whether current concentrations are driven by ongoing primary emissions from their original uses, or whether ambient PCBs are dominated by their environmental cycling. Freely dissolved PCBs in air and water were measured using polyethylene passive samplers across Lakes Erie and Ontario during summer and fall, 2011, to investigate their spatial distribution, determine and apportion their sources and to asses their air-water exchange gradients. Average gaseous and freely dissolved ∑29 PCB concentrations ranged from 5.0 to 160 pg/m(3) and 2.0 to 55 pg/L respectively. Gaseous concentrations were significantly correlated (R(2) = 0.80) with the urban area within a 3-20 km radius. Fugacity ratios indicated that the majority of PCBs are volatilizing from the water thus acting as a secondary source for the atmosphere. Dissolved PCBs were probably linked to PCB emissions from contaminated sites and areas of concern. Positive matrix factorization indicated that although volatilized Aroclors (gaseous PCBs) and unaltered Aroclors (dissolved PCBs) dominate in some samples, ongoing non-Aroclor sources such as paints/pigments (PCB 11) and coal/wood combustion showed significant contributions across the lower Great Lakes. Accordingly, control strategies should give further attention to PCBs emitted from current use sources.
Graduate School of Oceanography, University of Rhode Island , 215 South Ferry Road, Narragansett, Rhode Island 02882, United States.|Department of Environmental Sciences, Faculty of Science, Alexandria University , 21511 Moharam Bek, Alexandria, Egypt.
Mohammed
M
Khairy
Aquatic Contaminants Research Division, Environment Canada , Burlington, Ontario L7R 4A6, Canada.
Derek
D
Muir
Aquatic Contaminants Research Division, Environment Canada , Burlington, Ontario L7R 4A6, Canada.
Camilla
C
Teixeira
Graduate School of Oceanography, University of Rhode Island , 215 South Ferry Road, Narragansett, Rhode Island 02882, United States.
Rainer
R
Lohmann
D000393:Air Pollutants / Q000032:analysis*; D001140:Aroclors / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D006114:Great Lakes Region; D060106:Lakes / Q000032:analysis*; D009864:Ontario; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D012621:Seasons; D062211:Spatio-Temporal Analysis; D014835:Volatilization; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000393:Air Pollutants; D001140:Aroclors; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls