Chemical influences on trace metal-sulfide interactions in anoxic sediments

Morse, John W.; Luther, George W.

doi:10.1016/s0016-7037(99)00258-6

Cited by 709 publications

(476 citation statements)

References 30 publications

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“…Correlation between Cr in F4 fraction and organic carbon is however not significant except in core 2 (Table 2). Although Cr is lithophilic, it seldom associates with sulfides (Morse and Luther 1999), and this is also evident from the poor correlation (except core 3).…”

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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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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“…[49][50][51] Uma atenção especial começou a ser dispensada à determinação dos sulfetos de ferro lábeis no sedimento, fase esta responsável por ser a fonte de sulfeto para a complexação dos demais metais com potencial contaminante. Estipulou-se então, para efeitos operacionais, uma classe chamada acid volatile sulfide (AVS) que são aqueles sulfetos capazes de se transformar em ácido sulfídrico (H 2 S) e serem liberados do sedimento na forma gasosa, mediante acidificação do meio com ácido clorídrico (HCl) na concentração final de 1 mol L -1 e a frio, sob purga de gás inerte.…”

Section: Sulfetos Volatilizáveis Por Acidificação E Metais Extraídos unclassified

“…103 Além disso, o modelo é muito bom para prever toxicidade aguda, mas não contempla os possíveis efeitos causados por bioacumulação. 104 As transições de fase sólida dos sulfetos de ferro, que de mackinawita e greigita passam a pirita, podem causar uma redisponibilização dos metais coprecipitados nessa reorganização estrutural, 51 mas não necessariamente, já que outras fases ligantes podem ser formadas nessas novas condições. 5,66 Efeitos antagônicos, aditivos ou sinérgicos, bem como a biomagnificação, não são contemplados pelo modelo.…”

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Sulfetos volatilizáveis por acidificação e metais extraídos simultaneamente na avaliação de sedimentos de água doce

Fagnani¹,

Guimarães²,

Mozeto³

et al. 2011

Quím. Nova

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Recebido em 1/9/10; aceito em 16/5/11; publicado na web em 29/6/11 ACID VOLATILE SULFIDES AND SIMULTANEOUSLY EXTRACTED METALS IN THE ASSESSMENT OF FRESHWATER SEDIMENTS. This paper discusses the historical and methodological fundaments of the dynamics and quantification of acid volatile sulfides (AVS) and simultaneously extracted metals (SEM) in aquatic sediments. It also discusses the SEM/AVS relationship, which involves several controversial aspects such as sulfide stability, sulfide-organic matter interaction, and the inability to predict the toxicity of organic compounds in the environment. This relationship is an important tool for the inference of metal bioavailability. The use of ecotoxicological tests with target organisms regulated by international standards is also a relevant aspect.Keywords: acid volatile sulfides; simultaneously extracted metals; freshwater sediments. INTRODUÇÃOCom o avanço da ciência e da industrialização, houve uma alteração muito grande no fluxo de elementos químicos entre os principais compartimentos naturais: hidrosfera, atmosfera, litosfera, biosfera e a antroposfera.1 A indústria da transformação, a construção civil, a demanda energética, a consequente extração de recursos minerais e a intensificação da produção de alimentos são exemplos de atividades que causam grandes impactos ao ambiente, caracterizando a influência antropogênica no planeta. Os ciclos biogeoquímicos de muitos metais ainda não foram amplamente elucidados, carecendo de pesquisas no sentido de explicar quais as implicações em se perturbar um compartimento ocasionando mobilizações e transporte de espécies químicas antes naturalmente armazenadas de forma estável, com consequentes modificações nos tempos de residência e alterações nos padrões de interações de tais metais com a biosfera.Neste sentido, estudos de especiação aliados a testes de toxicidade revelam que a quantificação da concentração total de metais existentes em determinado meio não é o melhor indicador de potencial tóxico, já que o fator biodisponibilidade não pode ser estimado por esta variável. Podem ocorrer situações em que um compartimento natural apresente altos teores totais de determinado metal, mas todo ele esteja indisponível para ser incorporado à biota, enquanto que, em outras situações, concentrações mais baixas do mesmo metal são mais deletérias aos seres vivos, dada a sua facilidade de se incorporar aos tecidos, causando intoxicações e podendo levar a sérias injúrias. 2-5 CARACTERÍSTICAS E IMPORTÂNCIA DOS SEDIMENTOSDentre todos os compartimentos naturais, os sedimentos dos corpos aquáticos se destacam pela sua complexidade e pela capacidade de concentrar e armazenar substâncias potencialmente tóxicas, sendo que mesmo após o encerramento das atividades-fonte de determinado processo impactante, e mesmo que a água atenda aos padrões de qualidade, os sedimentos ainda podem se manter contaminados, promovendo processos de bioacumulação por muito tempo. 6Segundo a rede mundial de sedimentos, SedNet, o sedimento é uma parte essencial, integral ...

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“…However, in PO 4 2− dominated systems, 95% of total Mn will still be present as relatively soluble MnHPO 4 at this pH, and Mn will therefore continue to stay in solution for a prolonged period. Moreover, Mn 2+ will not form insoluble sulfide phases (MnS) easily when Fe 2+ is present (Morse and Luther 1999), which is almost always the case.…”

Section: Floodplain Soil Reductionmentioning

confidence: 99%

“…2) Zn and Cd concentrations in pore water rise by a factor 2; the addition of gypsum leads to increased release from the solid phase; 3) Little effects were observed for Ni and Cr. Ni 2+ has slower reaction kinetics than the other metals (Morse and Luther 1999;Snodgrass 1980), which indicates that those metals form sulfide phases prior to Ni. Cr is inert to reaction with sulfide.…”

Section: Gypsum Amendmentmentioning

confidence: 99%

Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

Vink

Harmsen²,

Rijnaarts

2010

J Soils Sediments

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Purpose The consequences of permanent inundation and storage of flood plain soils and aquatic sediments on metal mobility were studied. The main goal was to quantify kinetic mobilisation processes in order to pinpoint the conditions that pose emission risks to groundwater and surface waters. Materials and methods Anaerobic pore water compositions of six existing depots, containing sediments from either aquatic or terrestrial origin, were measured to obtain reliable field references. Reduction experiments were performed with SOFIE cells, in which time-dynamic measurements of reducing pore waters were carried out at the reigning redox conditions. A parallel experiment tested the possibility if sulfide-deficiencies could be compensated by the reduction of added gypsum, thus increasing the available pool of reactive S. Model calculations were performed to distinguish between the thermodynamic and kinetic processes. Results and discussion Reduction of flood plain soils showed that dissolved organic matter (DOM) concentrations increased up to 7-fold over time, as a result of nutrient-mediated metabolic boost of organic matter degrading microorganisms. The association of metals to DOM increased significantly due to the loss of reactive Mn-oxide and Fe-oxyhydroxide sorption phases during reduction. DOM released metals only slowly, therefore kinetically hindering the phase shifting to stable metalsulfide precipitates. The observed effects lasted at least 10 months. In aquatic sediments, reduction rates of sulphates were six times faster, and the release of DOM occurred in lower amounts than in soils from terrestrial origin. It is shown that the addition of gypsum stimulates the formation of sulfides, thereby decreasing dissolved concentrations of most metals. On the short term however, the addition of gypsum leads to elevated concentrations of Zn and Cd due to increased electrolyte strength and subsequent Ca-metal-competition for sorption sites. This effect may be eliminated by not only adding an electron acceptor to the sediment, but also an effective donor, e.g., degradable organic matter. Conclusions For depots containing flood plain soils, the same kinetic mechanisms were observed as in the reduction experiments (elevated production of DOM and associated metals). It was concluded that reduction of flood plain soils may not necessarily result in efficient metal trapping. When storage is considered, a distinction should be made between sediments of terrestrial and aquatic origin.

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Chemical influences on trace metal-sulfide interactions in anoxic sediments

Cited by 709 publications

References 30 publications

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

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

Sulfetos volatilizáveis por acidificação e metais extraídos simultaneamente na avaliação de sedimentos de água doce

Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

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