Bustamante J.,Kimika Analitikoa Saila |
Albisu A.,Kimika Analitikoa Saila |
Bartolome L.,Kimika Analitikoa Saila |
Prieto A.,Kimika Analitikoa Saila |
And 6 more authors.
International Journal of Environmental Analytical Chemistry | Year: 2010
Polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), methylmercury (MeHg+) and butyltins (mono-, di- and tri-butyltin, MBT, DBT and TBT) were monitored in oysters (Crassostrea sp.) and sediments collected in different sampling points of the UNESCO reserve of the biosphere of Urdaibai (Bay of Biscay) from March 2006 to June 2007. In the case of oyster samples, concentrations in the 290-1814 μg kg-1 (PAHs), 70-475 μg kg-1 (PCBs), 75-644 μkg-1 (MeHg+) and 200-1300 μg kg-1 (as a sum of the three butyltins) ranges were obtained. In most samples TBT was the most abundant butyltin, followed by DBT and MBT. It should be highlighted that most samples exceeded the highest range (367 μgkg-1) found in the last mussel watch programme carried out by the National Oceanic and Atmospheric Administration (NOAA) for butyltins in oyster samples. This could be due to the presence of a shipyard in the estuary. Sediment concentrations ranged as follows: total PAHs (856-3495 μgkg-1) and total PCBs (58-220 μg kg-1). Organometallic species were always below the limits of detection (LODs) (0.24 μg kg-1 for MeHg+, 0.6 μg kg-1 for MBT, 0.48 μg kg-1 for DBT and 1.1 μg kg-1 for TBT). In both sediment and oyster PAH sources were mostly combustion. In the case of PCBs, 4-6 chlorine-atom congeners were the most abundant ones. Slight differences in the profile of PAHs as well as PCBs can be detected when the matrices were compared with each other. Finally, in the case of PAHs, sediment and water column played the main role in the accumulation pathway into the organisms in all the sampling stations. © 2010 Taylor & Francis.