210Po Activity and Concentrations of Selected Trace Elements (As, Cd, Cu, Hg, Pb, Zn) in the Muscle Tissue of Tunas Thunnus albacares and Katsuwonus pelamis from the Eastern Pacific Ocean

摘要

Daily mineral intake (DMI) of Cu and Zn, percentage weekly intake (PWI) of As, Cd, Hg, Pb, and doses of 210Po were estimated by using their elemental concentration in muscle of two tuna species and the average tuna consumption in Mexico. Skipjack tuna Katsuwonus pelamis had significantly (p 0.05) higher levels of As (1.38 μg g−1 dw) and Cu (1.85 μg g−1 dw) than yellowfin tuna Thunnus albacares, whereas Pb concentrations (0.18 μg g−1 dw) were significantly (p 0.05) higher in T. albacares. The sequence of elemental concentrations in both species was Zn Cu As Hg Pb Cd. In T. albacares, concentrations of Cd and Pb in muscle tissue were positively correlated (p 0.05) with weight of specimens, while Cu was negatively correlated. DMI values were below 10 %. PWI figures (2 %) are not potentially harmful to human health. 210Po concentration in T. albacares and K. pelamis accounts for 13.5 to 89.7 % of the median individual annual dose (7.1 μSv) from consumption of marine fish and shellfish for the world population.