Abstract
The main factors determining the geochemical fate of copper in urban freshwaters affected by raw sewage discharges were investigated in this work. Water samples from the Iraí and Iguaçu rivers were collected monthly during a 1-year period at two points located upstream and downstream from the city of Curitiba, in Brazil. Results revealed that raw sewage discharges from the heavily urbanized area caused an enhancement of humic-coated suspended solids in the Iguaçu River. In these waters copper is predominantly associated with the humic-coated particles whereas in the Iraí River copper was found primarily in the aqueous phase. The transfer of copper from the aqueous to the solid phase changed its physical speciation along the watercourse. Thus, aspects related to the overall transport of trace metals in watercourses become an important issue to be considered in further studies concerning the effect of sewage discharges on the geochemical speciation and fate of trace metals in urban rivers.
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Sodré, F.F., Grassi, M.T. Changes in Copper Speciation and Geochemical Fate in Freshwaters Following Sewage Discharges. Water Air Soil Pollut 178, 103–112 (2007). https://doi.org/10.1007/s11270-006-9158-2
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DOI: https://doi.org/10.1007/s11270-006-9158-2