Abstract
This research evaluates the granulometric, organic matter and oxides distribution on sediments of the Tres Marias lake. Thus, a sampling network was established based on the main input of sediment in the lake and on the morphology of the lake, totaling 40 samples. After collection, the material was dried at 40 ° C for 36 hours and then treated by dry sieving. The Fe and Al oxides content was determined by ICP-OES. The measurements using loss-on-ignition methods gave the organic matter content. The organic concentration was compared to the environmental guidelines established by CONAMA No. 354/2012. The concentrations was exceeded by seven samples. The sediment supply comming from Sao Francisco, Sao Vicente, Paraopeba, Extrema, Ribeirao do Boi, Borrachudo and Indaia rivers pointed to an overall predominance of the sand fraction along the margin sediments and high disparities between their granulometry. The higher aluminum concentrations are disposed at central-east zone of the Lake, concordantly with the higher organic matter ratios. The higher iron concentrations are mainly on Indaia River.
Highlights
Department of GeologyA spacial analysis of organic matter, oxides and granulometric distribution on sediments as a support for geochemical analysis on Três
It is a common knowledge in environmental analyses that bottom sediments are a natural receptor of pollutants and that their characteristics react directly to anthropogenic inputs
According to Almeida et al (1977), Três Marias lake is immersed in the southern portion of the São Francisco Craton (CSF), an area that stabilized geotectonically at the end of the Transamazonian cycle (2.1 to 1.8 Gyr) working as the forefoot for the circumferential orogenic parameters: the organic matter content, the granulometric distribution and the disposal of oxi- hidroxides of iron and aluminum and their correlation with land use and soil management
Summary
A spacial analysis of organic matter, oxides and granulometric distribution on sediments as a support for geochemical analysis on Três. RESUMO Esta investigação avalia a disposição da matéria orgânica, dos óxidos de ferro e alumínio, bem como a distribuição granulométrica nos sedimentos de fundo na represa de Três Marias/MG. Foi realizada a coleta de 40 amostras ao longo de todo o lago. As concentrações de ferro e alumínio foram determinadas por ICP OES. O teor de matéria orgânica foi obtido pelo método de perda por ignição. As maiores concentrações de alumínio foram observadas na porção centro-leste da represa e estão relacionadas com os locais de alta concentração de matéria orgânica. As maiores concentrações de ferro estão dispostas majoritariamente no Rio Indaiá. Palavras-Chave: Matéria orgânica, lago de Três Marias, Barragem da CEMIG, distribuição de granulometria
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.
