PCDD/F and PCB multi-media ambient concentrations, congener patterns and occurrence in a Mediterranean coastal lagoon (Etang de Thau, France)

摘要

Ambient concentrations, congener patterns and multi-media distribution of PCDD/Fs and PCBs were determined in air, water, sediment and mussels in a semi-enclosed marine ecosystem (Thau lagoon, France). ∑2,3,7,8-PCDD/F and ∑7ICES PCB air concentrations (0.2-1.4 and 31-57 pg m~(-3), respectively) were typical of rural areas. Concentrations in the water column were very low for PCDD/Fs (163-476 fg L~(-1)) and low for PCBs (138-708 pg L~(-1)). PCDD/F and PCB concentrations found in surface sediment (0.15-1.6 and 2.5-33 ng g~(-1) d.w., respectively) and mussel (13-21 pg g~(-1) d.w. and 10-39 ng g~(-1) d.w., respectively) were medium levels. PCDD/F congener patterns observed in air, water paniculate phase and sediments were similar suggesting direct coupling among these compartments and atmospheric inputs of PCDD/Fs into the lagoon. Conversely, for the same set of samples, similar patterns were not observed for PCBs in the mentioned compartments.