Avaliação da bioacumulação de metais em Tilápia do Nilo (Oreochromis niloticus) cultivadas na região de Londrina

Abstract

World production of fish and fish products has been focused on human consumption. The intake of this kind of food within quality standards is beneficial to health, being often related to the prevention of diseases such as the cardiovascular ones. However, when non-standard, there are health risks associated with the contamination by chemicals and heavy metals, so the concern regarding the standard of the product has increased. The state of Paraná is considered one of the largest producers of Nile tilapia in the country, and its kind of production ranges from semi-intensive, characterized as excavated tank and intensive, as network tank. The presence of heavy metal on the environment is due to natural or man-related sources, being able to affect the human being through the food chain. From these considerations, this study aims to verify the quality of the fillet of Nile tilapia collected from different properties located in different basins of the state of Paraná, regarding the contamination of Pb, Cd, Zn, Hg Ni, Cr and Cu metals, followed by drying and the wet digestion of the samples. To quantify the traces of these metals, the ICP-OES method was used, where curves were obtained at different concentrations. We were unable to detect levels of Cd and Ni, but on the other hand the quantification of Crand Hg found was above the tolerance limits established by ANVISA, so that in the long term, with bioaccumulation, it can become harmful to human health. Given this is a pioneering work, the possible cause for these contamination levels should be checked more thoroughly in future work through the analysis of water and feed.