Mercury and methylmercury concentrations in Mediterranean seafood and surface sediments, intake evaluation and risk for consumers

Total mercury and methylmercury concentrations were measured in sediments and marine organisms from the Taranto Gulf to understand their distribution and partitioning. Sediment concentrations ranged from 0.036 to 7.730 mg/kg (mean: 2.777 mg/kg d.w.) and from 1 to 40 mu g/kg (mean: 11 mu g/kg d.w.) for total mercury (THg) and methylmercury (Me-Hg), respectively. In mollusks THg ranged from n.d. to 1870 mu g/kg d.w. while in fish from 324 to 1740 mu g/kg d.w. Me-Hg concentrations in fish ranged from 190 to 1040 mu g/kg d.w. and from n.d. to 1321 mu g/kg d.w. in mollusks. THg exceeded the maximum level fixed by the European Commission (0.5 mg/kg w.w.) only in gastropod Hexaplex t. The calculated weekly intake was in many cases over the Provisional Tolerable Weekly Intake established by EFSA for all edible species. These results seem to indicate that dietary consumption of this seafood implicates an appreciable risk for human health. (C) 2011 Elsevier GmbH. All rights reserved.