Fractionation studies of mercury in soils and sediments: A review of the chemical reagents used for mercury extraction

Issaro, N.; Abi-Ghanem, Carine; Bermond, Alain

doi:10.1016/j.aca.2008.10.020

Cited by 171 publications

(84 citation statements)

References 136 publications

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“…These can easily be transported by natural processes and absorbed by plants. 1,40 In our study, the sum of the water-soluble fraction and the "human stomach acid"-soluble fraction were considered to be the "bioavailable inorganic Hg". 32,33 Our data suggested that the "bioavailable inorganic Hg" accounted for 0.02−0.18% of the THg amount in soil.…”

Section: Resultsmentioning

confidence: 99%

Growing Rice Aerobically Markedly Decreases Mercury Accumulation by Reducing Both Hg Bioavailability and the Production of MeHg

Wang

Luo³

et al. 2014

Environ. Sci. Technol.

102

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Rice consumption represents a major route of mercury (Hg) and methylmercury (MeHg) exposure for those living in certain areas of inland China. In this study we investigated the effects of water management on bioavailable Hg, MeHg, and sulfate-reducing bacteria (SRB, abundance and community composition) in rhizosphere soil, and total Hg (THg) and MeHg in rice plants grown under glasshouse and paddy field conditions. Aerobic conditions greatly decreased the amount of THg and MeHg taken up by rice plants and affected their distribution in different plant tissues. There were positive correlations between bioavailable Hg and THg in brown rice and roots and between numbers of SRB and MeHg in brown rice, roots, and rhizosphere soil. Furthermore, the community composition of SRB was dramatically influenced by the water management regimes. Our results demonstrate that the greatly reduced bioavailability of Hg and production of MeHg are due to decreased SRB numbers and proportion of Hg methylators in the rhizosphere under aerobic conditions. These are the main reasons for the reduced Hg and MeHg accumulation in aerobically grown rice. Water management is indicated as an effective measure that can be used to reduce Hg and MeHg uptake by rice plants from Hgcontaminated paddy fields.

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Section: Resultsmentioning

confidence: 99%

Growing Rice Aerobically Markedly Decreases Mercury Accumulation by Reducing Both Hg Bioavailability and the Production of MeHg

Wang

Luo³

et al. 2014

Environ. Sci. Technol.

102

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“…So, Hg often forms stable complexes with humic substances. 10 Some studies report the importance of sulfides in the control of releasing metals from sediments into the aquatic system. In general, an increase in sulfides reduces a metal's bioavailability to water flow.…”

Section: Partial Extraction Proceduresmentioning

confidence: 99%

“…9 All Hg compounds have high toxicity indexes concerning living organisms with organic Hg species being the most toxic. 10 Mercury occurs naturally with other elements, mainly sulfur, forming the cinnabar mineral (HgS). Other natural Hg sources are volcanic eruptions, natural evaporation, and Hg mines.…”

Section: Introductionmentioning

confidence: 99%

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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“…As known, Hg in soil occurs in various forms that can be bound to different matrix phases and these matrix phases vary upon mobility, bioavailability and potential toxicity (Issaro et al, 2009). Therefore, THg has been regarded as a poor indicator for the toxicological and environmental hazards of Hg contamination in soil.…”

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confidence: 99%

Accumulation of total mercury and methylmercury in rice plants collected from different mining areas in China

Meng¹,

Li²,

Shao³

et al. 2014

Environmental Pollution

145

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a b s t r a c tA total of 155 rice plants were collected from ten mining areas in three provinces of China (Hunan, Guizhou and Guangdong), where most of mercury (Hg) mining takes place in China. During the harvest season, whole rice plants were sampled and divided into root, stalk & leaf, husk and seed (brown rice), together with soil from root zone. Although the degree of Hg contamination varied significantly among different mining areas, rice seed showed the highest ability for methylmercury (MeHg) accumulation. Both concentrations of total mercury (THg) and MeHg in rice plants were significantly correlated with Hg levels in soil, indicating soil is still an important source for both inorganic mercury (IHg) and MeHg in rice plants. The obvious discrepancy between the distribution patterns of THg and MeHg reflected different pathways of IHg and MeHg accumulation. Water soluble Hg may play more important role in MeHg accumulation in rice plants.

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Fractionation studies of mercury in soils and sediments: A review of the chemical reagents used for mercury extraction

Cited by 171 publications

References 136 publications

Growing Rice Aerobically Markedly Decreases Mercury Accumulation by Reducing Both Hg Bioavailability and the Production of MeHg

Growing Rice Aerobically Markedly Decreases Mercury Accumulation by Reducing Both Hg Bioavailability and the Production of MeHg

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

Accumulation of total mercury and methylmercury in rice plants collected from different mining areas in China

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