Arsenic mobilization from sulfidic materials from gold mines in Minas Gerais State

Andrade, Renato Pereira de; Filho, Salomão Santana; Mello, Jaime Wilson Vargas de; Figueiredo, Bernardino Ribeiro; Dussin, Tânia Mara

doi:10.1590/s0100-40422008000500037

Cited by 13 publications

(7 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This region has high arsenopyrite contents, FeAsS. 30,31 Frequently, gold is found associated to this mineral, which explain high As and Hg levels in this place.…”

Section: Aqua Regia Pseudo-total Digestion Proceduresmentioning

confidence: 89%

“…This region has high arsenopyrite contents, FeAsS. 30,31 Frequently, gold is found associated to this mineral, which explain high As and Hg levels in this place.The samples from BP 036, BP 079, and BP 084 points presented As values between Level 1 and Level 2. Data in 2008 from IGAM (Instituto Mineiro de Gestão das Águas) on the water quality demonstrated that the main contamination sources in these areas (Paraopeba sub-basin) are related to domestic sewage and industrial effluents.…”

mentioning

confidence: 89%

“…35 The samples from PTE 023, which presented the highest As and Hg levels, are located in a region of naturally occuring high sulfides levels. 30,31 Samples with low percentages in the partial extraction procedure might be due to partial imobilization of As and Hg from the iron oxides and sulfides present in the sediments.Data from Table 3 was submitted to a Pearson correlation test (P < 0.05 and N = 28). The test showed a positive and significant correlation for Hg and As (r = 0.62).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Arsenic and Mercury mobility in brazilian sediments from the São Francisco River Basin

Rezende¹,

Moura²,

Durão³

et al. 2011

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Os sedimentos possuem propriedades de acumulação de poluentes e a determinação de elementos tóxicos nessas amostras permite avaliar o seu ciclo geoquímico. Arsênio e mercúrio foram determinados em 28 amostras de sedimento da Bacia do Rio São Francisco, Minas Gerais, Brasil, por geração de hidretos acoplada à espectrometria de absorção atômica (HG AAS). Foram empregados procedimentos de digestão pseudo-total empregando HCl:HNO 3 (3:1 v/v) e extração parcial com HCl 1 mol L -1 . Realizou-se ainda a determinação de Hg nas amostras sólidas, utilizando-se um analisador direto de mercúrio. Observou-se que 46% das amostras apresentaram concentrações de As acima do limite de nível 1 estabelecido pela Resolução 344/2004 do CONAMA e que 14% excederam o limite de nível 1 para Hg. As amostras com altas concentrações de Hg foram também analisadas por termodessorção acoplada à espectrometria de absorção atômica (TDAAS) para especiação e os termogramas apontaram somente a presença da espécie Hg(II).Sediments have metal accumulation properties, then, an evaluation of their geochemistry cycle is feasible via toxic element determination of these samples. Arsenic and mercury determinations were accomplished in 28 sediment samples from the São Francisco River Basin, Minas Gerais, Brazil. For sample pretreatment were employed a pseudo-total digestion procedure with HCl:HNO 3 (3:1 v/v) and a partial extraction procedure with 1 mol L -1 HCl. Arsenic and mercury were analysed by hydride generator atomic absorption spectrometry (HG AAS). Mercury determination was realized in the solid samples by direct mercury analyzer (DMA). It was observed that 46% of the samples presented arsenic concentrations above Brazil's legal limits, and 14% of samples exceeded the established mercury limit. The samples with high mercury content were also analysed by thermodesorption coupled to atomic absorption spectrometry (TDAAS) and only Hg(II) was identified.Keywords: arsenic, mercury, sediment samples, environmental monitoring, São Francisco River IntroductionIn most aquatic environments, dissolved metal concentrations in overlying water are low due to the precipitation of solids or the adsorption of suspended particles and the deposition of these particles as sediments. 1 Sediment is a matrix comprising inorganic and organic particles. It is relatively heterogeneous in terms of its physical, chemical, and biological characteristics. Sediments have an important role in the transport and storage of contaminants, being of high relevance in the identification of contaminant sources and in the determination of dispersion pathways. Sediment quality determines the biodiversity and the ecological health in aquatic systems as well as being economically important in the environmental assessment of coastal areas. 2 São Francisco is the third largest hydrographic basin in Brazil. It is responsible for drainage of a 640.000 km² area, corresponding to 8% of land in the country of Brazil. About 40% of the basin is located in the state of Minas Gerais and it is divided ...

show abstract

“…This region has high arsenopyrite contents, FeAsS. 30,31 Frequently, gold is found associated to this mineral, which explain high As and Hg levels in this place.…”

Section: Aqua Regia Pseudo-total Digestion Proceduresmentioning

confidence: 89%

mentioning

confidence: 89%

mentioning

confidence: 99%

See 1 more Smart Citation

Arsenic and Mercury mobility in brazilian sediments from the São Francisco River Basin

Rezende¹,

Moura²,

Durão³

et al. 2011

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…In soils, substrates and tailings from gold mining areas of Brazil, high levels of total As have been measured, e.g., up to 46,493 mg As kg -1 (Andrade et al 2008;Borba et al 2000Borba et al , 2003Deschamps et al 2002;Matschullat et al 2000); however, bioaccessibility tests for this element have not yet been carried out for these areas. In general, such mining areas are quite densely populated regions, with cities located very close to the mines.…”

Section: Introductionmentioning

confidence: 99%

Arsenic bioaccessibility in a gold mining area: a health risk assessment for children

Ono

Guilherme

Penido

et al. 2011

Environ Geochem Health

View full text Add to dashboard Cite

High concentrations of total arsenic (As) have been measured in soils of gold mining areas of Brazil. However, bioaccessibility tests have not yet been conducted on those materials, which is essential for better health risk estimates. This study aimed at evaluating As bioaccessibility in samples from a gold mining area located in Brazil and assessing children's exposure to As-contaminated materials. Samples were collected from different materials (a control and four As-contaminated soils/sediments) found in a gold mine area located in Paracatu (MG), Brazil. Total and bioaccessible As concentrations were determined for all samples. The control soil presented the lowest As concentrations, while all other materials contained high total As concentrations (up to 2,666 mg kg(-1)) and low bioaccessible As percentage (<4.2%), indicating a low risk from exposure of resident children next to this area. The calculated dose of exposure indicated that, except for the pond tailings, in all other areas, the exposure route considering soil ingestion contributed at most to 9.7% of the maximum As allowed ingestion per day (0.3 μg kg(-1) BW day(-1)).

show abstract

“…Arsenopyrite is the most common sul de mineral, which is generally associated with gold (Au) mining. Its oxidation, dependent on several factors, including the amounts of arsenopyrite, distribution of the size of the ore, temperature, and the time of exposure of the material to water and oxygen (De Andrade et al 2008), produces arsenic oxyacids that facilitate their release into the soil and watercourse (De Andrade et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Arsenic in Mining Area: Environmental Contamination Route

Hott¹,

Oliveira²,

Bomfeti³

et al. 2021

Preprint

View full text Add to dashboard Cite

The emission of residues has contributed immensely to the fact that man is susceptible and exposed to toxic chemical products, among them, arsenic. One of the main anthropic sources of arsenic in the world is mining, which can contribute to the contamination of soil, water, air, and food. An example of environmental arsenic contamination in Brazil occurs in the city of Paracatu - MG, due to the operation of a gold mine. Thus, the objectives of this study were: (i) to assess the physical-chemical parameters and the concentration of arsenic in samples of superficial fresh water (sub-basin of the Paracatu River), and soil samples, during winter and summer; (ii) evaluate the arsenic concentration in samples of particulate matter; (iii) determine the concentration and species of As in biological samples and (iiii) evaluate the toxicity of surface waters using the Allium cepa test. There was no change in the physical-chemical parameters. The water samples collected during the winter and all soil samples showed values of As above those allowed by organs regulatory agencies. The values of As in the particulate material showed great variations between the regions under study but were within the limit established by the ATSDR for urban areas. Inorganic and organic As was found above the limit allowed in biological samples The analysis of water toxicity by the Allium cepa test indicated the presence of cytotoxic and genotoxic compounds, demonstrating a great risk for the population exposed to the waters of the Rico stream.

show abstract

Arsenic mobilization from sulfidic materials from gold mines in Minas Gerais State

Cited by 13 publications

References 29 publications

Arsenic and Mercury mobility in brazilian sediments from the São Francisco River Basin

Arsenic and Mercury mobility in brazilian sediments from the São Francisco River Basin

Arsenic bioaccessibility in a gold mining area: a health risk assessment for children

Arsenic in Mining Area: Environmental Contamination Route

Contact Info

Product

Resources

About