Mercury (Hg) and methylmercury (MeHg) in sediment and biota: A case study in a lagoon in Central Italy

Mancini, Laura; Miniero, Roberto; Beccaloni, Eleonora; di Domenico, Kevin; Lacchetti, Ines; Puccinelli, Camilla; Cicero, Maria Rita; Scaini, Federica; Carere, Mario

Mercury (Hg) and methylmercury (MeHg) in sediment and biota: A case study in a lagoon in Central Italy

2022

A quantification of total mercury (Hgₜₒₜ) and methylmercury (MeHg) concentrations in sediment and mussels was carried out in the east basin of the Orbetello lagoon in order to assess their bioaccumulation potential. The sediment was sampled in four macroareas, mussels were transplanted in the same sites and collected after seven weeks. The results show that Hgₜₒₜ concentrations in sediments exceeded (0.21–16.9 mg/kg dry weight (dw)) the environmental quality standard of the Italian legislation (0.3 mg/kg dw). The Hgₜₒₜ concentration in mussels (0.050–0.324 mg/kg wet weight (ww)) does not exceed the limit values (0.5 mg/kg ww) of the European food legislation. The biota–sediment accumulation factors (BSAFs) derived for MeHg (80–306.7) and a biomagnification factor (BMF) greater than 1 for Hgₜₒₜ demonstrate that in the lagoon, these compounds can be transferred in the upper levels of the trophic chain and pose a risk to human health.

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