Control of geochemical mobility of arsenic by liming in materials subjected to acid mine drainage

Andrade, Renato Pereira de; Figueiredo, Bernardino Ribeiro; Mello, Jaime Wilson Vargas de; Santos, Julio C. Z.; Zandonadi, Lorenza U.

doi:10.1065/jss2008.03.283

Cited by 17 publications

(10 citation statements)

References 26 publications

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“…Such reduction can be attributed mainly to the greater absorption by the plants and the increment in pH with the increase in the doses. Higher pH values favor iron precipitation and, consequently, the reduction in As mobilization due to the adsorption or coprecipitation in the iron oxyhydroxides (Andrade et al, 2008). Thus, plants absorbed more As even with the reduction of its availability at the highest P doses, which reinforces the theory of the mass effect.…”

Section: Resultssupporting

confidence: 68%

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Guimarães

Dias

Assis

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe processing of gold ores exploited in Paracatu, MG, generates tailings that are challenging for revegetation, mainly because of the high content of arsenic and salinity. Aiming at the revegetation of the area of disposal of these tailings, the objective of this study was to evaluate the effects of phosphorus doses on vetiver plants (Chrysopogon zizanioides) and on the planting substrate, which consisted of tailings from the processing of ore named B1, exploited in Paracatu, with water restriction. Vetiver was grown for four months in the substrate under doses of 0, 140, 280, 560 and 1280 mg kg -1 of P 2 O 5 . Increasing doses of phosphorus improved the chemical characteristics of the substrate. However, the highest dose (1280 mg kg -1 P 2 O 5 ) resulted in higher toxicity of arsenic for the plants. Under the evaluated conditions, the dose of 560 mg kg -1 of P 2 O 5 is the most suitable for the fertilization of vetiver and, therefore, also for the revegetation of the substrate. Vetiver survives under low availability of water in the tailings.Cultivo de vetiver em um rejeito salino contaminado com arsênio sob doses de fósforo IntroductionSome ores exploited for gold production may contain toxic elements, such as arsenic (As), in their composition, causing environmental problems. In Brazil, gold and iron mining has contributed to the dispersion of As and its entry in the food chain (Campos et al., 2006).The tailings produced in the processing of gold ores exploited in Paracatu, MG, Brazil, have limiting characteristics to plant growth, especially acidity, salinity and high As concentrations, which compromise the process of revegetation of the basin where they are disposed. A practice that can facilitate the establishment of plants in these tailings is phosphate fertilization.The addition of P has been reported as inhibitor of As absorption (Lei et al., 2012). Phosphate and arsenate are chemically similar and share the same membrane transporters in root cells, and the transporters have higher affinity for the phosphate (Tu & Ma, 2003;Zhao et al., 2008).Besides phosphate fertilization, plants tolerant to As and to salinity may have promising responses for the revegetation of tailings. One species with desirable characteristics to start the process of revegetation is Chrysopogon zizanioides (vetiver). The species, besides having high biomass production, has high tolerance and capacity of accumulation of contaminants (Singh et al., 2007).In this context, this study aimed to evaluate the effects of P doses on vetiver plants and on the planting substrate, which consisted of tailings from the processing of one of the gold ores exploited in Paracatu, MG, Brazil, subjected to water restriction. Material and MethodsThe substrate consisted of tailings from the processing of B1 ore, which is a highly weathered phyllite, with sulfide contents around 3.0 g kg -1 , collected in Paracatu, MG, Brazil. Three samples of the substrate were collected for its initial characterization, through the determination of pH i...

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Section: Resultssupporting

confidence: 68%

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Guimarães

Dias

Assis

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…In sediment samples from Paracatu, de Andrade et al 31 found arsenic concentrations up to 1500 µg g -1 . Based on last report from IGAM, As and Hg in water were below the legal values.…”

Section: Aqua Regia Pseudo-total Digestion Proceduresmentioning

confidence: 99%

“…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: 99%

“…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.…”

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confidence: 99%

“…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).…”

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confidence: 99%

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

Rezende¹,

Moura²,

Durão³

et al. 2011

J. Braz. Chem. Soc.

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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 ...

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Arsenic Mobility in Sediments from Paracatu River Basin, MG, Brazil

Rezende

Costa

Windmöller

2015

Arch Environ Contam Toxicol

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Paracatu River Basin, Minas Gerais, Brazil, houses long areas of irrigated agriculture and gold-, lead-, and zinc-mining activities. This region has a prevalence of sulfide minerals and a natural occurrence of high levels of arsenopyrite. In this work, surface water, groundwater, sediments and local vegetable samples were collected in October 2010 and November 2011 and were analyzed to evaluate arsenic (As) distribution, mobility, and transport in these environmental compartments. All sediment samples (738-2,750 mg kg(-1)) and 37 % of the water samples [less than the limit of detection (LOD) to 110 µg L(-1)] from the rivers and streams of Paracatu had As concentrations greater than the quality standards established by national and international environmental organizations (5.9 mg kg(-1) for sediments and 10 µg L(-1) for water). Most vegetable samples had As concentrations within the normal range for plants (lower than the LOD to 120 mg kg(-1)). A correlation among As concentrations in water, sediment, and vegetable samples was verified.

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Control of geochemical mobility of arsenic by liming in materials subjected to acid mine drainage

Cited by 17 publications

References 26 publications

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

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

Arsenic Mobility in Sediments from Paracatu River Basin, MG, Brazil

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