Determinação de cobre em brânquios e fígado de peixes por espectrometria de absorção atômica com chama

Abstract

The development of modern societies accelerates the consumption of food and manufactured goods, consequently a large amount of waste, often toxic, are incorporated to the fluvial means river and contaminate the animal species present favoring a cycle of contamination via food chain with participation of the human being. The present work had as its scope the seasonal collection of specimens of fish, several species, at strategic points along the Ijuí River, five in all, and the analysis of the liver tissue and gills by FAAS. The digestion process was carried out with HNO 3 , the wet, being efficient in the digestion of the liver tissue and satisfactory with gills. The methodology adopted in the detection with FAAS has been shown to be efficient with validation parameters obtained and appropriate for the determination of metal copper in the tissues. The results obtained in the five collection points indicate no contamination by the metal copper, according to the limits imposed by the Brazilian Legislation, however it is noteworthy that in two points of collection, the gills had the presence of higher copper in relation to other points, in the same manner as other two collection points, distinct from the first, the liver had the greatest presence of copper. The means of absorption and retention of copper metals are not generic to both bodies, the way the metal is in the middle determines the location of retention, even below the limits of contamination can be said to have different sources for the promotion of the metal and the biota along the riverbed.