Comparative study of optimised BCR sequential extraction scheme and acid leaching of elements in the certified reference material NIST 2711

Larner, Bronwyn L.; Seen, Andrew J.; Townsend, Ashley T.

doi:10.1016/j.aca.2005.09.058

Cited by 107 publications

(52 citation statements)

References 26 publications

(43 reference statements)

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“…22,23 Therefore, 10 mL of recently prepared aqua regia were added to about 1000 mg of sediment (fraction < 0.063 mm). The mixture was kept for 16 h at room temperature, then refluxed for 2 h in a digestion block at 90 ºC.…”

Section: Pseudo-total Digestion Proceduresmentioning

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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Section: Pseudo-total Digestion Proceduresmentioning

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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“…For the analysis of total metal (Cd, Pb, Cu, Zn, Mn, Fe, Ni, and Cr) concentrations, three subsamples were digested in 65% HNO3 using a microwave Speed Wave (Berghof, Eningen, Germany). The operationally defined BCR (Community Bureau of Reference of the European Commission, now the Standards, Measuring and Testing Programme) procedure was used to study the fractionations of heavy metals in the sediments (Larner et al, 2006). This procedure allows the determination of four operationally defined phases of metals, i.e.…”

Section: Physicochemical Characteristics Of the Water And Sediment Inmentioning

confidence: 99%

Genomic alterations recorded in two species of Chironomidae (Diptera) in the Upper Jurassic limestone area of the Ojców National Park in Poland attributable to natural and anthropogenic factors

Michailova¹,

Szarek-Gwiazda²,

Kownacki³

et al. 2012

Eur. J. Entomol.

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Abstract. The Ojców National Park is situated in southern Poland in an area of Jurassic limestone, which determines the hydrochemistry of the water in the River Pr dnik. The geochemical index of the sediment in the River Pr dnik indicated it is moderately polluted with Pb and Zn, and heavily polluted with Cd compared to unpolluted sediment. The effect of natural and anthropogenic sources on the sediment in the River Pr dnik and in appearing of structural and functional alterations in the salivary gland chromosomes of two species of Chironomidae, Micropsectra pallidula and Polypedilum convictum, was investigated. Two types of chromosomal rearrangements (inherited and somatic) were identified in the species studied. Inherited heterozygous inversions occurred at a higher frequency (between 5.55%-57.81%) and may have local adaptive value. In M. pallidula a karyotype divergence consisting of fixed chromosome inversions on arms B and E was recorded. As somatic chromosome rearrangements can be caused by stress agents, we suggest that the somatic aberrations in both of the species studied indicate the existence of pollution, i.e. induced stress. On the basis of these somatic rearrangements the somatic index of both species was defined: M. pallidula -0.346, P. convictum -0.555. In addition to these rearrangements functional alterations in key structures, Balbiani rings (BRs) and the nucleolar organizer region (NOR) located on chromosome EF, which significantly decreased their transcriptional activity, were recorded in M. pallidula. Changes in the appearance of the telomere region on chromosome G in P. convictum was considered to be a response to the environmental conditions in the River Pr dnik. It was shown that polytene chromosomes are very sensitive to environmental changes and can be used to detect pollutants in aquatic ecosystems.

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“…Trace elements were also determined with the use of both total resolution method and BCR-SEP (sequential extraction method) method. The use of sequential extraction schemes gives the opportunity to study metal distribution in different sediment phases and helps to predict metal mobility and their possible transfer from sediment to aquatic media (Larner et al, 2006;Thomas et al, 1994). The total resolution method was carried out for the surface sediment of every sediment core.…”

Section: Clay Samples Analysesmentioning

confidence: 99%

Environmental – Hydrogeological Investigations on the Clay Deposits in the Broad Area of Mesologgi – Aitoliko Lagoons

et al. 2017

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Comparative study of optimised BCR sequential extraction scheme and acid leaching of elements in the certified reference material NIST 2711

Cited by 107 publications

References 26 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

Genomic alterations recorded in two species of Chironomidae (Diptera) in the Upper Jurassic limestone area of the Ojców National Park in Poland attributable to natural and anthropogenic factors

Environmental – Hydrogeological Investigations on the Clay Deposits in the Broad Area of Mesologgi – Aitoliko Lagoons

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