The presence of mercury, cadmium and lead has been studied in raw and processed fish and shellfish of the main traded species in Galicia (Spain) from at least 40 commercial outlets between January 2002 and October 2003. The results show that, according to European legislation, the products on the market are generally "safe", although the high levels of mercury in swordfish and shark are notable, with 22% of samples (n = 37) over the limit. We also indicate the relatively important contribution to mercury ingestion of widely consumed species, such as tuna, with 25% of samples (n = 378) over 0.25 mg kg⁻¹. Cadmium was over the limit (1.0 mg kg⁻¹) in 15% of the tested cephalopods (n = 79) and 29% of Chlamys sp. bivalves (n = 17).
2,3,4,7, 2,3,7, 2,3,7,2,3,7, and PCB 126. Higher accumulation efficiency values were obtained for dl-PCBs (30 -46%); tetra-and penta-chloro substituted PCDD/Fs showed the highest values (27 -34%) of the PCDD/F group. Biomagnification was shown for these compounds (BMF around 1.5).
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