INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Trace metals intake of Nacella (P) magellanica from the Beagle Channel, Tierra del Fuego (Patagonia, Argentina).
MARCELO CONTI; JORGE D. STRIPEIKIS; G. MELE; F. BOTRÉ; MABEL TUDINO
Mar del Plata
Congreso; I CONGRESO INTERNACIONAL DE CIENCIA Y TECNOLOGÍA AMBIENTAL, Y I CONGRESO NACIONAL DE LA SOCIEDAD ARGENTINA DE CIENCIA Y TECNOLOGÍA AMBIENTAL; 2012
Sociedad Argentina de Tecnología Ambiental
Nacella species and Mytilus species constitute a popular food in the Beagle Channel zone as both of them are well distributed in the area. With the aim to infer the daily intake of heavy metals through the consumption of these gastropod mollusks in the diet, more than one hundred individuals of Nacella (P) magellanica were sampled, separated in viscera and muscle, and then examined with respect to the accumulation of different transition metals. Collection was performed in seven strategic locations along 170 kilometers of the coastal area of the Beagle Channel (Tierra del Fuego, Argentina) in two campaigns during 2005 and 2007.In this study, the intake of the trace metals Cd, Cr, Cu, Ni, Pb and Zn by mollusks was calculated and evaluated in terms of the potential risks to human health derived from their consumption. Particularly, cadmium and lead presented more interest as they are non essential and very well known toxic metals. Our studies revealed that Cd and Pb levels are below the tolerance levels for human consumption assuming a daily intake of 50 g. Regarding chromium, the mean standardized levels found in this study were much lower than the threshold tolerance limit established for shellfish by USFDA. For Cu, eating a normal portion of 50 g (wet weight) of mollusks implies an intake of Cu that barely exceeds the Recommended Dietary Allowance (RDA); for Zn eating 50 g (w.w.) of mollusks implies an intake that exceeds the Recommended Daily Intake (RDI) level established by FAO/WHO (2002). No harm was noticed regarding nickel intake as it resulted quite below according to the tolerable upper intake levels (ULs) established by the Food and Nutrition Board (2001). Nonetheless, the integrated evaluation of the results evidence that risks for humans seem unlikely for the regular consumption in the area. Further discussion will be provided on this issue.Moreover, the accumulation values in viscera and muscle of the gastropod mollusk Nacella (P) magellanica that allowed the above calculations will be presented and fully discussed. Some new investigations that are being performed in the area with the same purpose will be shown in advance.