Geochemistry of river suspended sediments in tropical watersheds: anthropogenic and granite-gneiss sources, SE Brazil

Silveira, Carla Semiramis; Brandão, Vitor Schwenck; Bernedo, Alfredo Victor Bellido; Mantovano, José Luiz

doi:10.1080/15715124.2016.1213271

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…However, the concentrations of aluminium were higher in the Tchangué watershed than in the Kienké. The range of aluminium in the present results also is less than those recorded by Silveira et al. (2016) in sediments from Piabanha watershed in Brasil, and Bessa et al.…”

Section: Resultscontrasting

confidence: 86%

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

Mandeng

Bidjeck

Bessa

et al. 2019

Heliyon

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In this investigation, the level of toxic metals (Cd, Pb, Hg, Cu, Ni, Al, Zn and U) was determined in sediment samples from two watersheds (Kienké and Tchangué) in the Abiete-Toko gold district, southern Cameroon. The potential contamination and toxicity of studied metals was determined by evaluating enrichment factor (EF), geo-accumulation index (Igeo) and ecological risk assessment (ERA). Considering the spatial distribution patterns, metal concentrations were lower than the average shale values, except for Cu and Ni of site 4 in the Kienké watershed and only Ni in the Tchangué watershed. In this study, the EF and Igeo values revealed that sediments were moderately polluted by Ni and Cu and unpolluted by other metals. The evaluation of the ERA based on ecological risk index (RI), ecological risk factor (Er), contamination factor (CF) and pollution load index (PLI) revealed that the sediments from the Abiete-Toko watersheds have significant to very high ecological risk assessment and are generally unpolluted by trace metals and U, except for Ni and Cu. Little quantities of heavy metals with low U levels and distribution were found at the sites close to the vicinity of artisanal mining and peri-urban areas. This proximity reveals that artisanal gold mining activities, agricultural runoff, and other anthropogenic inputs in the study area are probable sources of slight metal contamination. However, the non-use of toxic effluents for gold mining and pesticides for agriculture can be an advantage of the unpolluted status of the watersheds. The physical degradation of the ecosystem through excavations, wells and other stream diversion methods is expanding in the zone. Appropriate measures should be taken by artisans to rehabilitate the gold mining sites, to ensure appropriate treatment of wastewater and non-use of toxic effluents into nearby tributaries.

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Section: Resultscontrasting

confidence: 86%

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

Mandeng

Bidjeck

Bessa

et al. 2019

Heliyon

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“…The development of tracers to identify sediment sources and pathways is another important advance acquired when sediment fractions are observed (Minella et al 2008, Tiecher et al 2017. Also, geochemical studies have been performed to identify whether the sediment source is natural or anthropogenic (Silveira et al 2016). Thus, by using models calibrated from field measurements and tracing techniques, it is possible to determine where the sediment is generated and to trace its pathway through the basin (Lorz et al 2013).…”

Section: Main Findings and Advancesmentioning

confidence: 99%

“…Water quality monitoring in the MBs has (i) enhanced our knowledge of geochemical parameters of suspended sediments in rivers in tropical basins (Silveira et al 2016); (ii) improved methodologies to set up monitoring locations more efficiently (Villas-Boas et al 2017); (iii) identified the most relevant WQ parameters (Villas-Boas et al 2017); (iv) identified stormflow as an important pathway for carbon and nutrient loss (Nóbrega et al 2018a); (v) detected high concentrations of nutrients in overland flow; and (vi) showed the importance of forested riparian buffers in reducing solute transfer from land to water in tropical basins (Williams et al 1997).…”

Section: Main Findings and Advancesmentioning

confidence: 99%

The big picture of field hydrology studies in Brazil

Melo

Anache

Almeida

et al. 2020

Hydrological Sciences Journal

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In-situ hydrological monitoring is essential for a proper decision-making process and modelling. Efforts have been made in Brazil to carry out field activities at the basin scale, but how complete and comprehensive are those studies? Where are they located? How long have they been carried out? What are the main findings? To answer these questions, an overview of experimental monitoring basins in Brazil is presented, listing their geographical locations, monitored variables, operational status, monitoring periods and main publications. We identified 60 monitored sites, spread across most Brazilian biomes, with an average monitoring period of 12 years. However, some publications from these monitoring studies are not fully accessible to the international community. Field hydrology activities in Brazil contribute to a better understanding of hydrological processes in humid and semiarid regions and inform us about the impacts of land-use change on water quality and quantity.

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“…The Piabanha basin contains growing, unregulated domestic settlements, industries with high pollution potential, and agricultural activities (Cesar et al 2011, Villas-Boas et al 2017. The river has a mean annual discharge of 40 m 3 /s, oscillating between 80 m 3 /s (wet period) and 15 m 3 /s (dry period) (Silveira et al 2016), which may vary widely along its course, with lower mean discharge in the upper stretch (Da Silva et al 2017). For phytoplankton, Graco-Roza et al (2020), based on monthly sampling for one year in different stretches of the river, found a relationship between phytoplankton variation and environmental heterogeneity, highlighting the importance of river dynamics in shaping phytoplankton communities, with a smaller effect during the rainy period.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

Barreto¹,

Furtado²,

Folharini³

et al. 2022

Oecol. Austr.

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Rivers, as most bodies of water, are subject to eutrophication and water contamination, mainly from domestic sewage and industrial discharges from urban centers and agricultural areas. These growing human impacts result in a gradual loss of water quality and changes in biotic communities, including phytoplankton. Analyzing the dynamics of phytoplankton is important to understand how, in addition to hydrography and the physical, chemical and biological variables, human impact can be a controlling factor in this dynamic. In this study, we analyzed abiotic variables and zooplankton abundance to identify the factors controlling different phytoplankton attributes at six sampling points, in two climatic periods and three years, in the Piabanha River, a slowly flowing stream with to strong human impact beginning in its upper course, in a mountain region in southeastern Brazil. The results showed homogeneous environmental variables and different phytoplankton attributes along most of the stretch analyzed, except for sampling point 1, located in a preserved forest area but with nutrient concentrations limiting phytoplankton growth. The difference in flow between the two climatic periods (dry and wet) was not sufficient to change the total phytoplankton biovolume. Temperature seemed to strongly affect the phytoplankton response, with larger relative contributions from cyanobacteria in the wet period, with higher temperatures, and from phytoflagellates in the dry period, with lower temperatures. As expected, zooplankton showed no influence on phytoplankton dynamics, with a large contribution from small rotifers. In this tropical montane river, with slow flow and intense human impacts, nutrient concentrations and temperature were the main drivers of the spatial and temporal dynamics of phytoplankton, respectively

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Geochemistry of river suspended sediments in tropical watersheds: anthropogenic and granite-gneiss sources, SE Brazil

Cited by 5 publications

References 22 publications

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

The big picture of field hydrology studies in Brazil

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

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