Evaluation of environmental contamination by heavy metals through the analysis of fish collected from Lagoa Mangueira – RS
DOI:
https://doi.org/10.6008/CBPC2179-6858.2019.001.0015Keywords:
Bioaccumulation, Mangueira Lagoon, Heavy MetalsAbstract
The presence of heavy metals in the aquatic environment can originate naturally, due to weathering of the rocks or by anthropogenic actions, with the release of waste and untreated sewage. The objective of the present study was to determine the concentration of Cr, Cu, Ni, Pb and Zn metals in fish samples such as jundiá (Rhamdia quelen), traíra (Hoplias malabaricus), vogue (Cyphocharax voga) and ladybirds (Crenicichla punctata) collected from Lagoa Mangueira - RS. The tissues of the muscles, gills and viscera of the fish were analyzed. Two methods of digestion were evaluated in the decomposition of the jundiá muscle (Rhamdia quelen) and the method chosen digested the fish tissue samples in 2: 1 (v / v) HNO3 / H2O2 solution under ultrasound at 70ºC for 10 min. In parallel, the certified material DORM-3 was analyzed to evaluate the accuracy of the method used in the digestion of samples. The order of distribution of the heavy metals in the tissues of the muscles, gills and viscera of the analyzed species was Zn> Cu> Cr> Pb, with Cr and Pb being quantified only in the investigated parts of the traíra (Hoplias malabaricus) and Ni was not detected in no species. Through the calculation of the bioaccumulation factor (FBA) the level of metals in the sediment that could become bioavailable to the fish was evaluated. The analytes were quantified using flame atomic absorption spectrometry (FAAS)
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