02041naa a2200325 a 450000100080000000500110000800800410001902200140006002400330007410000170010724501310012426000090025552011120026465000190137665000170139565000100141265000240142265000230144665000170146965000090148665000180149565300220151365300230153570000210155870000190157970000170159870000180161570000170163377300650165020578422017-02-13       2016    bl uuuu     u00u1 u    #d  a1678-43757 a10.1590/1519-6984.052152DOI1 aSOUZA, A. M.  aSeasonal study of concentration of heavy metals in waters from lower São Francisco River basin, Brazilh[electronic resource]  c2016  aIn this study we determined the concentration of metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) in the water lower São Francisco River basin, to evaluate the influence of urbanization and industrialization on environmental changes in the water resource. All samples were analyzed using the IUPAC adapted method and processed in an atomic absorption spectrophotometer. The sampling stations located near the industrial areas were influenced by industrialization because they presented higher concentrations of Cd, Cr, Ni and Cu. The other sampled locations showed changes with regard the trace elements probably originating in the soil, like Fe, Zn and Pb. There was a gradual increase in the concentrations of metals, in general, in the period of highest rainfall of the hydrographic network. Overall, except for Zn and Mn, the trace elements exceeded the maximum allowed value established by national legislation (CONAMA). Lower São Francisco River basin has suffered interference from urbanization and industrialization, so awareness programs should be developed so as to control and lessen future problems.  aTrace elements  aUrbanization  aÁgua  aBacia Hidrográfica  aIndustrialização  aMetal pesado  aSolo  aUrbanização  aElementos traços  aRio São Francisco1 aMENDES, A. M. S.1 aMELO, J. F. B.1 aFELIX, W. P.1 aBELÉM, C. S.1 aRAMOS, P. N.  tBrazilian Journal of Biologygv. 76, n. 4, p. 967-974, 2016.