Metal ion speciation — soils and sediments (a review)

Pickering, W.F.

doi:10.1016/0169-1368(86)90006-5

Cited by 294 publications

(194 citation statements)

References 138 publications

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“…High copper content in the residual fraction of river sediments was also found by Budimir and Marko (1995). The high proportion of Cu in this fraction is likely due to that Cu is chemisorbed on or incorporated in clay minerals (Pickering, 1986). About 20% of Zn in average was found in the non-residual fraction in our study.…”

Section: Cobalt Nickel Copper and Zincmentioning

confidence: 43%

Speciation of heavy metals in marine sediments from the East China Sea by ICP-MS with sequential extraction

Yuan

Shi

et al. 2004

Environment International

426

171

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Twelve elements (V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Sn, Cd and Pb) in 24 sediment samples at eight sites (S1 -S8) from the East China Sea were analyzed with the BCR sequential extraction (SE) protocol to obtain the metal distribution patterns in this region. The results showed that the heavy metal pollutions in S4 and S8 were more severe than in other sampling sites, especially Cd and Pb pollution. In the top sediments at S4 and S8, both the total contents and the most dangerous non-residual fractions of Cd and Pb were extremely high. More than 90% of the total concentrations of V, Cr, Mo and Sn existed in the residual fraction. Fe, Co, Ni, Cu and Zn mainly (more than 60%) occurred in the residual fraction. While Mn, Pb and Cd dominantly presented in the non-residual fractions in the top sediments. The metal distribution patterns with depth and the correlations between total organic carbon (TOC) and the total Fe -Mn content were also investigated. The results showed that, for most of the elements except Fe, the concentration of elements in fraction A in the top sediments was higher than that in other depth. The similar rule was also found in fraction B but not in fraction C. Besides, the distributions of V, Cd in fraction B and Pb, Cd, Cu in fraction C might be affected by TOC. D

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Section: Cobalt Nickel Copper and Zincmentioning

confidence: 43%

Speciation of heavy metals in marine sediments from the East China Sea by ICP-MS with sequential extraction

Yuan

Shi

et al. 2004

Environment International

426

171

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“…11,12 Foram realizadas determinações de metais totais presentes em amostras de sedimentos e suas frações definidas por um procedimento de extração seqüencial, segundo o método de Kersten e Förstner. 5 Adotou-se ainda o método de extração a frio em meio de HCl 0,1 mol L -1 para se estimar a fração dos metais lábeis, móveis, ou também considerados potencialmente biodisponíveis [11][12][13] ou ainda pode determinar a qualidade de sedimentos. 14 Este trabalho teve como objetivo avaliar os níveis de concentração de metais pesados e suas possíveis associações em amostras de sedimentos de fundo do Rio Tietê, no trecho compreendido entre o Reservatório de Pirapora até o de Barra Bonita.…”

Section: Introductionunclassified

Extração seletiva de metais pesados em sedimentos de fundo do Rio Tietê, São Paulo

Bevilacqua

Silva²,

Lichtig³

et al. 2009

Quím. Nova

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Recebido em 24/10/07; aceito em 13/8/08; publicado na web em 20/1/09 SELECTIVE EXTRACTION OF HEAVY METALS IN BOTTOM SEDIMENTS FROM TIETÊ RIVER, SÃO PAULO. Sediment samples from Tietê river were submitted to chemical and sequential extractions of heavy metals (Cd, Cr, Cu, Ni, Pb and Zn). It was followed a single extraction by using 0.1 mol L -1 hydrochloric acid and a sequential procedure to evaluate possible chemical associations described as exchangeable, carbonate, reducible oxides, sulfide, organic matter and residual fractions. High concentrations of heavy metals were determined at Pirapora reservoir, which is closer to the Metropolitan Area of São Paulo while for Barra Bonita reservoir, the results showed low concentrations for such elements. Acid volatile sulfides, grain size distribution and carbon contents were also determined.Keywords: heavy metals; sediment; chemical and sequential extractions. introduçãoHá pelo menos 3 décadas, os sedimentos já não têm sido considerados somente ambientes de deposição de espécies químicas, mas um compartimento aquático ativo que desempenha um papel fundamental na redistribuição dessas espécies à biota aquática. 1 Os processos naturais de formação de sedimentos vêm sendo intensamente alterados pela ação do homem. A erosão do solo causada pela construção de prédios e rodovias, bem como o lançamento direto de efluentes industriais e municipais têm propiciado um perfil significativamente diferente daqueles verificados em ambientes naturais não impactados. 2 Nesse contexto, uma atenção especial deve ser dada aos metais pesados, que não são naturalmente degradados, nem mesmo permanentemente fixados pelos sedimentos, podendo assim retornar à coluna d'água através de alterações de suas propriedades físico-químicas, tais como pH e potencial redox. 3 Sob condições operacionais definidas, os métodos analíticos de extração seqüencial têm sido aplicados com a proposta de se avaliar a distribuição dos metais nas diferentes formas que compõem o sedimento, tendo em vista o comportamento, a reatividade e o destino dessas espécies nos ambientes aquáticos. 3 Os métodos de extração seqüencial consistem em submeter uma determinada amostra de sedimento sob condições de extração em etapas cada vez mais enérgicas (tipos de reagentes, concentração, tempo e temperatura). As frações obtidas dizem respeito à proporção do metal que está associada a uma referida fase geoquímica. .Kersten e Förstner 4,5 desenvolveram um método de extração seqüencial que foi aplicado num estudo dos sedimentos do Rio Elba, altamente impactados, cujas frações foram definidas como trocáveis, metais ligados a carbonatos, metais associados aos óxidos facilmente redutíveis, metais associados aos óxidos moderadamente redutíveis e residual.Alguns problemas têm sido apontados aos métodos de extração seqüencial, tais como possíveis redistribuições do metal entre fases, seletividade dos reagentes, além da falta de concordância entre os resultados, principalmente para sedimentos anóxidos. 5,6 Embora os métodos de extração aprese...

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“…Consistent with this, Cu in F4 fraction in sediments correlates well with organic carbon and sulfur (except core 1; Table 2). High concentration of Cu in the F5 fraction in surface sediments and cores may be due to its association with clay minerals (Pickering 1986). In core 1, the lack of vegetation, and the sandy nature at the sampling site results in the poor correlation of Cu with organic carbon and sulfur.…”

Section: Total Cr Concentration Increased By Approximately Five Foldsmentioning

confidence: 99%

Trace metal fractionation in the Pichavaram mangrove–estuarine sediments in southeast India after the tsunami of 2004

Ranjan

Singh

Routh

et al. 2013

Environ Monit Assess

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The geochemistry of coastal sediments of southern India was altered after the tsunami in 2004. A five-step sequential extraction procedure was applied to assess the effects of tsunami on mobility and redistribution of selected elements (Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn). Ten surface sediments and three cores were analyzed for different metal fractions (exchangeable, carbonate, reduced, oxidized, and residual). Total metal concentrations increased in mangrove sediments after the tsunami, but their spatial distribution did not show significant variation (except Mn). The sediments were mixed by the tsunami, and there was lack of variation in metal concentrations in different fractions with depth (except Pb and Mn). High concentrations of Pb and Zn occurred in the oxide fractions, whereas Cu, Cr, Cd, and Ni were high in the organic and sulfide rich fractions. Metals in the residual fraction (lattice bound) had the highest concentration suggesting their nonavailability and limited biological uptake in the system. Most of the metals (except Mn) do not constitute a risk based on the different geochemical indices.

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Metal ion speciation — soils and sediments (a review)

Cited by 294 publications

References 138 publications

Speciation of heavy metals in marine sediments from the East China Sea by ICP-MS with sequential extraction

Speciation of heavy metals in marine sediments from the East China Sea by ICP-MS with sequential extraction

Extração seletiva de metais pesados em sedimentos de fundo do Rio Tietê, São Paulo

Trace metal fractionation in the Pichavaram mangrove–estuarine sediments in southeast India after the tsunami of 2004

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