Joined by geochemistry,divided by history: PCBs and PBDEs in Strait of Georgia sediments |
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| Institution: | 1. Departamento de Zoología, Instituto de Biología, Universidad Nacional Autonoma de Mexico, Avenida Universidad 3000, Ciudad Universitaria, C.P. 04510, Distrito Federal;2. Instituto de Biología Marina y Pesquera Almirante Storni, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Güemes 1030, 8520, San Antonio Oeste, Río Negro, Argentina;3. Universidad de la Sierra Sur, División de Estudios de Postgrado, Guillermo Rojas Mijangos S/N, C. P. 70800, Ciudad Universitaria, Miahuatlán de Porfirio Díaz, Oaxaca, Mexico |
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| Abstract: | Polychlorinated biphenyls (PCBs) are relict contaminants, while polybrominated diphenyl ethers (PBDEs) are in increasing use. Using sediment cores collected in the Strait of Georgia, we demonstrate that the surface sediment concentration of PCBs is largely determined by environmental processes, such as sediment accumulation and mixing rates, while that of PBDEs is strongly influenced by proximity to source. The Iona Island wastewater outfall appears to be a primary pathway for PBDEs. As well, Vancouver Harbour is highly contaminated with both classes of chemical. BDE-209, the main component of deca-BDE, is the dominant PBDE congener. Environmental debromination is not evident. Currently, the ranges of the surface concentration of PCBs and PBDEs are similar to one another, but that will change in the future, as the concentration of PBDEs continues to rise. The experience with PCBs suggests that if PBDEs were banned today, it would take decades for inorganic sediment to bury them. |
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