Methylmercury determination in fish and seafood products and estimated daily intake for the Spanish population
Résumé
The mercury contents of 25 samples of fish and seafood products most frequently consumed in Spain were determined. A simple method comprising cold vapor and atomic absorption spectrometry was used to separately determine inorganic and organic mercury. In all samples, inorganic mercury content was below 50 μg kg-1. There was broad variability, not only among the mercury levels of different fish species, but also among different samples of the same species - with methylmercury content ranging from below 54 to 662 μg kg-1. The highest mean methylmercury content was found in fresh tuna. Based on an average total fish consumption of 363 g/person/week, the methylmercury intake was estimated to be 46.2 μg/person/week. Therefore, the mercury intake of Spanish people with a body weight ≤ 60 kg is lower than the JECFA PTWI of 1.6 μg/kg body weight, but exceeds the US-NRC limit of 0.7 μg/kg bw/week based on a benchmark dose.
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