Avaliação de selênio: estudo de caso em sedimento e em peixes comerciais do sudeste do Cráton Amazônico

Abstract

Selenium (Se) is an essential trace element in humans and animals, including fish. In continental aquatic ecosystems as Se natural attributes are very low, on the other hand, the elevation of Se levels in the environment may be associated with potentially anthropic activities. . Thus, the objective of this is to determine how you should use commercial sediments and fish in the southeast of the Amazonian Craton, assessing the possibility of risks from their consumption. The collection of ichthyofauna and sediment that occurred between May and June 2015 in the municipalities from Marabá, Parauapebas and Canaã dos Carajás, the fish were dissected, with the fillet separated for analysis, they were dried in an oven at 50ºC and then macerated. The sediments were collected using an Ekman-Birge dredge. For digestion, 0.10 g of dry muscle tissue from those required to react together 〖"HNO" 〗_"3" , 1 mL of HCl were used. and "H" _"2" "O" _"2" .The levels of Se were quantified by inductively coupled plasma optical emission spectrometry, with an automatic sampling system. The piranha (Serrasalmus spp) was the species that presented the largest according to the highest bioaccumulation factor., On the other hand, as the largest utilities of Se non sediment were chosen in the areas adjacent to iron and copper mining. The standards found are not a risk due to consumption, as confirmed by international bodies.