01946naa a2200217 a 450000100080000000500110000800800410001910000190006024501570007926000090023652012650024565000260151065000200153665000170155665000170157370000200159070000180161070000170162870000200164577300630166511348782024-09-17       2024    bl uuuu     u00u1 u    #d1 aLUNARDI, W. G.  aContamination by potentially toxic metals from urban rivers located in an area covered by the Guarani Aquifer in Southern Brazil.h[electronic resource]  c2024  aThe present study aimed to evaluate the concentration of heavy metals considered globally alarming, such  as  cadmium  (Cd),  chromium  (Cr),  copper  (Cu),  lead  (Pb),  and  zinc  (Zn),  in  the  surface  water  and  in the sediment of urban rivers located in an area covered by the Guarani Aquifer in Lages, southern Brazil. The water and sediment samples were collected in September and October 2016 in three urban rivers. The quantification of the metals was performed through an atomic absorption spectrometer. The levels of Cd, Cr, Cu, Pb and Zn in the control points (P1 and P7) presented a concentration below the level I proposed by Brazilian legislation 344/2004 of the National Environment Council (CONAMA), while the other points presented concentrations higher and above level I, evidencing an increase of metals in the rivers from upstream to downstream of the urban area of Lages. Cr concentrations above level II  proposed  by  Brazilian  legislation  at  the  mouth  of  the  Carah??  River  were  also  found,  and  this  value  may have adverse effects on aquatic biota. The results show that urban rivers in the area covered by the Guarani Aquifer in Lages have been contaminated by toxic elements associated with anthropogenic activities.  aEmerging contaminants  aGuarani Aquifer  aToxic metals  aUrban rivers1 aSIEGLOCH, A. E.1 aKEMPKA, A. P.1 aRECH, ??. F.1 aMAFRA, M. S. H.  tCi??ncia e Natura, Santa Maria, RS.gv. 46, p. 1-22, 2024.