エクアドル・キトで販売されている油漬け缶詰マグロ中の総水銀曝露量

Mercury (Hg) is a toxic element that bioaccumulates in aquatic organisms, posing health risks through seafood consumption. This study quantified total Hg in canned tuna in oil purchased from supermarkets in the Metropolitan District of Quito, Ecuador. Three commercial brands were analyzed according to market price (A < B < C) using a direct mercury analyzer. Mean Hg concentrations were 0.22 ± 0.10 mg/kg, 0.63 ± 0.10 mg/kg, and 0.36 ± 0.15 mg/kg for brands A, B, and C, respectively. All values complied with international safety limits; however, the non-carcinogenic risk (HQ > 1) associated with methylmercury exposure from brand C exceeded the reference threshold established by the U.S. Environmental Protection Agency. Recommended weekly intake of tuna to avoid health risks was estimated at 106 g (children) and 512 g (adults) for A; 26 g and 126 g for B; and 64 g and 307 g for C, respectively.