Trace metal and rare earth elements in a sediment profile from the Rio Grande Reservoir, São Paulo, Brazil: determination of anthropogenic contamination, dating, and sedimentation rates

Franklin, Robson L.; Fávaro, D. I. T.; Damatto, Sandra R.

doi:10.1007/s10967-015-4107-4

Cited by 30 publications

(7 citation statements)

References 18 publications

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“…Desta maneira, fica evidente que o tipo de gestão e o manejo realizados no reservatório pode contribuir para o incremento da toxicidade do sedimento, como a transposição eventual do Rio Pinheiros, a aplicação de produtos químicos ou mesmo a falta de fiscalização da ocupação irregular do solo no entorno do manancial (FRANKLIN et al, 2016;PADOVESI-FONSECA;PHILOMENO, 2004;ALVIM et al, 2015).…”

Section: Resultsunclassified

Metais nos Sedimentos em Reservatórios: há Toxicidade Potencial?

Ferreira¹,

Rani-Borges

Santos

et al. 2021

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Os metais são reconhecidos pelo caráter potencialmente tóxico às comunidades além de bioacumulativos em alguns organismos. No presente trabalho, avaliou-se as concentrações dos metais cádmio, cromo, cobre, chumbo, mercúrio e zinco em sedimentos de três pontos de amostragem nos reservatórios Billings, Guarapiranga e Rio Grande (São Paulo, Brasil) entre os anos 2008 e 2017. Os dados foram comparados à valores de referência regionais, à legislação local e a valores guia de qualidade de sedimento: nível de efeito limiar (TEL), nível de efeito provável (PEL) e Critérios de Avaliação dos Sedimentos (CQS). Amostras de sedimento do reservatório Billings apresentaram os maiores números de metais acima dos valores de referência e acima de PEL. Observou-se elevadas concentrações de cobre nos reservatórios Guarapiranga e Rio Grande, provavelmente em decorrência do sistema de gestão aplicado no local à base de Sulfato de Cobre Pentahidratado. Os dados analisados aqui, indicam que a falta de índices regionalizados, com valores de background e critérios de toxicidade para o sedimento, específicos para esses reservatórios é uma grande deficiência para análises mais acuradas e preditivas. Ainda assim, fica demonstrado que os níveis atuais de contaminação dos sedimentos dos reservatórios estão reduzindo a qualidade da água e pressionando negativamente a biota local e alterando e comprometendo o ecossistema aquático.

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Section: Resultsunclassified

Metais nos Sedimentos em Reservatórios: há Toxicidade Potencial?

Ferreira¹,

Rani-Borges

Santos

et al. 2021

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“…The XRF core scanning results from studies of marine sediments would necessarily have been affected by the moisture content of the core, as well as the particular core's carbonate content, particle composition and any changes in the density and porosity of its mineral composition. Of these drawbacks, high water content could be seen as the most negative influence on the accuracy of any results, as a high water content would inevitably reduce the density of any elements scanned using the XRF method [14][15][16]. Nonetheless, the accuracy of such XRF scanning can be improved by making scientifically-based water content corrections.…”

Section: Results and Analysismentioning

confidence: 99%

Comparison and correction of element measurements using qualitative and quantitative X-ray fluorescence in lacustrine sediments: A case study of Lake Hurleg

Cheng

Gao

et al. 2020

E3S Web Conf.

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Using an X-ray Fluorescence (XRF) core scanner with nondestructive and successive, the chemistry features of lacustrine sediment can be measured directly. This method of XRF core scanner measurements has been widely applied to core sediment analysis but uncertain of the precision and accuracy. Comparison of intensities obtained by XRF core scanning and the concentration measured by conventional X-ray Fluorescence, indicates effects of physical properties varied from different elements on elemental intensities in the lacustrine sediments of a core from Lake Hurleg in the northeastern Tibetan Plateau. Correlation among elements Ti and Sr between the two measurement methods of the XRF and the conventional XRF is high. Using the intensity of Cl as an indicator of water content, the element intensities of Ti and Sr in the core samples is corrected. But the correlation coefficients of Ti and Sr is litter raised. The results show that XRF core scanning is a very useful tool for measuring element concentration in sediments particularly for high intensities elements.

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“…Many dozens of case studies, e.g., [65][66][67][68], document the spatial distributions of 210 Pb and 210 Po, and successfully separate natural from anthropogenic sources. Activities of 210 Pb and 210 Po have also proven valuable for studies of glaciation and the accumulation and melting rates of ice sheets [69].…”

Section: Sedimentary Environmentsmentioning

confidence: 99%

“…The contemporary literature also reflects the many ways in which radioactive waste can be efficiently treated and immobilised ( [201] and references therein). Indeed, the "benefits" of man-made contamination have been highlighted in the more recent literature, notably the potential of short-lived anthropogenic radionuclides, including 210 Pb and 210 Po, as geochemical tracers for understanding processes and rates of sedimentation (e.g., [67]). …”

Section: Research Trends and Future Directionsmentioning

confidence: 99%

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

et al. 2018

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Abstract:The distributions of 210 Pb and 210 Po, short half-life products of 238 U decay, in geological and related anthropogenic materials are reviewed, with emphasis on their geochemical behaviours and likely mineral hosts. Concentrations of natural 210 Pb and 210 Po in igneous and related hydrothermal environments are governed by release from crustal reservoirs. 210 Po may undergo volatilisation, inducing disequilibrium in magmatic systems. In sedimentary environments (marine, lacustrine, deltaic and fluvial), as in soils, concentrations of 210 Pb and 210 Po are commonly derived from a combination of natural and anthropogenic sources. Enhanced concentrations of both radionuclides are reported in media from a variety of industrial operations, including uranium mill tailings, waste from phosphoric acid production, oil and gas exploitation and energy production from coals, as well as in residues from the mining and smelting of uranium-bearing copper ores. Although the mineral hosts of the two radionuclides in most solid media are readily defined as those containing parent 238 U and 226 Ra, their distributions in some hydrothermal U-bearing ores and the products of processing those ores are much less well constrained. Much of the present understanding of these radionuclides is based on indirect data rather than direct observation and potential hosts are likely to be diverse, with deportments depending on the local geochemical environment. Some predictions can nevertheless be made based on the geochemical properties of 210 Pb and 210 Po and those of the intermediate products of 238 U decay, including isotopes of Ra and Rn. Alongside all U-bearing minerals, the potential hosts of 210 Pb and 210 Po may include Pb-bearing chalcogenides such as galena, as well as a range of sulphates, carbonates, and Fe-oxides. 210 Pb and 210 Po are also likely to occur as nanoparticles adsorbed onto the surface of other minerals, such as clays, Fe-(hydr)oxides and possibly also carbonates. In rocks, unsupported 210 Pb-and/or 210 Po-bearing nanoparticles may also be present within micro-fractures in minerals and at the interfaces of mineral grains. Despite forming under very limited and special conditions, the local-scale isotopic disequilibrium they infer is highly relevant for understanding their distributions in mineralized rocks and processing products.

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Trace metal and rare earth elements in a sediment profile from the Rio Grande Reservoir, São Paulo, Brazil: determination of anthropogenic contamination, dating, and sedimentation rates

Cited by 30 publications

References 18 publications

Metais nos Sedimentos em Reservatórios: há Toxicidade Potencial?

Metais nos Sedimentos em Reservatórios: há Toxicidade Potencial?

Comparison and correction of element measurements using qualitative and quantitative X-ray fluorescence in lacustrine sediments: A case study of Lake Hurleg

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

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