Monitoring of a wide range of organic micropollutants on the Portuguese coast using plastic resin pellets

Kaoruko Mizukawa, Hideshige Takada, Maki Ito, Yeo Bee Geok, Junki Hosoda, Rei Yamashita, Mahua Saha, Satoru Suzuki, Carlos Miguez, João Frias, Joana Cepeda Antunes, Paula Sobral, Isabelina Santos, Cristina Micaelo, Ana Maria Ferreira
Marine Pollution Bulletin 2013 May 15, 70 (1-2): 296-302
We analyzed polychlorinated biphenyls (PCBs), dichlorodiphenyl dichloroethane and its metabolites, hexachlorocyclohexanes (HCHs), polycyclic aromatic hydrocarbons (PAHs), and hopanes, in plastic resin pellets collected from nine locations along the Portuguese coast. Concentrations of a sum of 13 PCBs were one order of magnitude higher in two major cities (Porto: 307 ng/g-pellet; Lisboa: 273 ng/g-pellet) than in the seven rural sites. Lower chlorinated congeners were more abundant in the rural sites than in the cities, suggesting atmospheric dispersion. At most of the locations, PAH concentrations (sum of 33 PAH species) were ∼100 to ∼300 ng/g-pellet; however, three orders of magnitude higher concentrations of PAHs, with a petrogenic signature, were detected at a small city (Sines). Hopanes were detected in the pellets at all locations. This study demonstrated that multiple sample locations, including locations in both urban and remote areas, are necessary for country-scale pellet watch.

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