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Source and Distribution of Mercury in Sediments of the Brazilian Amazon Continental Shelf with Influence from Fluvial Discharges

Gilmar W. Siqueira, Fabio Aprile, Georg Irion, Bruce G. Marshall, Elisabete S. Braga

Chemical Science International Journal · pp. 1–15 · Published 27 May 2016

10.9734/ACSJ/2016/26625

Abstract

Place and Aims: Total concentrations of Hg and geochemical analysis of sediments from the Amazon Continental Shelf (47º52'W-4º19'N, 51º04'W-2º16'S) were determined in 25 sampling sites, during the months of lowest flow of the Amazon River. The aim of this study was to determine the influence of fluvial discharge on mercury distribution and deposition in the environment. Duration of Study: Between 1999 and 2011. Analyzes: The marine sediments were used to identify heavy minerals, and determine grain size, organic content (organic matter and organic carbon), SiO2, Fe2O3, Al2O3 and MnO, and Hg levels using standard methods. Results and Conclusion: The Hg concentrations varied from 14 to 160 ng g-1. The highest Hg concentrations occurred in the inner shelf. Both analysis of major oxides and identification of mineral composition in the sediments confirmed the influence of river discharge on Hg deposition in the inner shelf. The geochemical results suggested that the main Hg source in the study area was from natural origins due to erosion and subsequent leaching of tropical lateritic soils, although mining in the Madeira and Tapajos river basins is also a contributing factor.

Total mercury mineralogy deposition oceanic currents Brazilian Amazon

References (37)

  1. 1 Environmental chemistry of the elements
  2. 2 The Smithsonian Atlas of the Amazon
  3. 3 Heavy Minerals in Provenance Studies [DOI]
  4. 4 Transport of particles across continental shelves [DOI]
  5. 5 Ecology and management
  6. 6 Episodic sediment accumulation on Amazonian flood plains influenced by El Niño/Southern Oscillation [DOI]
  7. 7 Micromorphology of Soils [DOI]
  8. 8 The Amazon shelf setting: tropical, energetic, and influenced by a large river [DOI]
  9. 9 Is the Negro River Basin (Amazon) impacted by naturally occurring mercury? [DOI]
  10. 10 Elevated mercury concentrations in soils, sediments, water, and fish of the Madeira River basin, Brazilian Amazon: a function of natural enrichments? [DOI]
  11. 11 Mercury in the environment and riverside population in the Madeira River Basin, Amazon, Brazil [DOI]
  12. 12 Evaluation of Cation Exchange Capacity (CEC) in Tropical Soils Using Four Different Analytical Methods [DOI]
  13. 13 An introduction to the geological significance of sediment transport and accumulation on the Amazon continental shelf [DOI]
  14. 14 Weathering and transport of sediments in the Bolivian Andes: Time constraints from uranium-series isotopes [DOI]
  15. 15 Mercury distribution in tropical soil profiles related to origin of mercury and soil processes [DOI]
  16. 16 Biogeochemistry of Mercury in the Amazonian Environment [DOI]
  17. 17 Speciation and quantification of mercury in Oxisol, Ultisol, and Spodosol from Amazon (Manaus, Brazil) [DOI]
  18. 18 Mercury release from deforested soils triggered by base cation enrichment [DOI]
  19. 19 The impacts of land use changes in the mercury flux in the Madeira River, Western Amazon [DOI]
  20. 20 Mobility of metals in salt marsh sediments colonised by Spartina maritima (Tagus estuary, Portugal) [DOI]
  21. 21 Sedimentation and sediments of Amazonian rivers and evolution of the Amazonian landscape since Pliocene times [DOI]
  22. 22 Clay minerals of Amazonian soils [DOI]
  23. 23 An overview of mercury contamination research in the Amazon basin with an emphasis on Brazil [DOI]
  24. 24 Forest fire indicators and mercury deposition in an intense land use change region in the Brazilian Amazon (Alta Floresta, MT) [DOI]
  25. 25 Mercury from Gold Mining in the Amazon Environment - an Overview
  26. 26 Preference ratios for mercury and other chemical elements in the Madeira River, Brazil [DOI]
  27. 27 Geological significance of sediment transport and accumulation on the Amazon continental shelf [DOI]
  28. 28 Amazon Fan sands: implications for provenance [DOI]
  29. 29 Land–sea mercury transport through a modified watershed, SE Brazil [DOI]
  30. 30 Mercury in soils and sediments from gold mining liabilities in Southern Amazonia [DOI]
  31. 31 Biogeochemistry of Mercury in the Amazonian Environment [DOI]
  32. 32 Trace metals in fluvial sediments of the Madeira River watershed, Amazon, Brazil☆ [DOI]
  33. 33 Hydroclimatology and biogeochemistry of the Amazon [DOI]
  34. 34 MINERAIS PESADOS PROVENIENTES DO LEITO DO RIO AMAZONAS [DOI]
  35. 35 DISTRIBUIÇÃO DE CARBONO, NITROGÊNIO, FÓSFORO E OUTROS PARÂMETROS GEOQUÍMICOS NA PLATAFORMA CONTINENTAL DO AMAZONAS, NORTE DO BRASIL [DOI]
  36. 36 Reconnaissance investigations of the discharge and water quality of the Amazon River [DOI]
  37. 37 Suspended sediment in the Amazon River and its tributaries in Brazil during 1982-84 [DOI]

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