BONGIOVANNI guillermina Azucena
congresos y reuniones científicas
Arsenic in Argentinian aquatic organisms in an ecologic context
LAMELA, PAULA A.; MARDIROSIAN, MARIANA N; VODOPIVEZ, CRISTIANL.; NAVONI, JULIO A.; PEREZ, CARLOS A; PEREZ, ROBERTO D.; CURTOSI, ANTONIO; BONGIOVANNI, GUILLERMINA A.
Taller; Técnicas de Luz Sincrotrón para Caracterización de Materiales; 2012
Asociación Argentina de Cristalografía
Arsenic is an abundant toxic metal in our environment and transported by water, which is the primary pathway of exposure for plants and animals, including humans. Throughout Argentina, As is a natural contaminant of many groundwater and some river beds where many species and about 4 million people are exposed to arsenic concentrations much higher than 0.010 mg/L. Although arsenic toxicology is well described for mammal models and humans, studies in other environments such as those affecting aquatic organisms are rare in Argentina. In this regard, arsenic accumulated by Rhinella arenarum (common toad), Diplodon chilensis (river´s clams), Mytilus edulis (mussels), Euphausia superb (Antarctic krill) and plants was measured by X-ray Fluorescence Spectrometry in grazing incidence geometry (SR-TXRF) at the D09B-XRF beamline from the Brazilian Synchrotron Light Laboratory (LNLS). Argentinian toad oocytes, obtained by in vitro fecundation, were incubated in Ringer solution containing 0 (control) or 1 µg/ml As up to larval life stage. Clams, mussels and krill were collected in the Río Negro, Patagonia river, Las Grutas, Patagonia beach and Isla 25 de Mayo, Antártida coast, respectively. Exposed plants were collected near to Copahue volcano. We found up to 54 µg/g of dry weight of As in toad larvae, while the highest As concentration in naturally exposed specie was 13.71 µg/g of dry weight, which was found in mussels. In an ecologic context, the As accumulation in these organisms, may have important implications since they are element of the food chain. So, the present results indicate that SR-TXRF technique would be a powerful tool for the assessment of As transfer in the aquatic ecosystems.