Abstract
Sediments are reservoirs for a variety of substances widely used as indicators of pollution in aquatic environments. In this research was carried out the evaluation of the concentration of metals in the pseudo-total and labile fractions in surface sediments at the mouth of four main tributaries of the Itaipu Reservoir. Three samplings were performed between February 2014 and March 2015 using Petersen type dredger. The determination of metals occurred by atomic absorption spectrometry and physical-chemical parameters by gravimetric and potentiometric techniques. The samples presented neutral to slightly alkaline character and homogeneous pHs. It was observed the predominance of the clay fraction and the occurrence of variable organic matter between the points. In the labile fraction, only the copper content reached concentrations higher than the thresholds effects levels (TEL) at all sampling points. In the pseudo-total fraction, some sites presented for Cr, Pb and Zn TEL level. For Ni, values of probable effects level (PEL) were verified and for Cu, concentrations in severe effect level (SEL) were reported according to the international sediment classification criteria adopted by the National Oceanic and Atmospheric Administration (NOAA).
Highlights
The technological advancement resulting from population and industrial growth contributes to increasing the use and deterioration of ecosystems
This indicates that the studied sediments have relatively homogeneous pH. This characteristic can favor the accumulation of metals in sediments because, the increase of the pH favors the precipitation of the dissolved metals[6]
This higher volatile solids (VTS) concentration indicates a higher occurrence of organic matter at these sampling points, which may favor the retention of metals in this matrix (Table 3)
Summary
The technological advancement resulting from population and industrial growth contributes to increasing the use and deterioration of ecosystems. Water is one of the main natural resources and after being used in various purposes, it returns to the environment with different quality from the original Several contaminants, such as metals, are incorporated, favoring the pollution of water bodies and consequent BSTRACT!. Artificial reservoirs and natural lakes are important surface water resources with great relevance for water supply, flood control, irrigation, aquaculture, climate regulation and maintenance of the ecological balance[1]. In this context, the Itaipu Reservoir is one of the largest artificial lakes in the world, whose main purpose is the generation of electricity, in addition to aquaculture and navigation. By its location and Eclética Química Journal, 43, special issue, 2018, 51-61
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
