Heavy metal distribution in marine sediments from the southwest coast of Spain

Morillo, José; Usero, José; Gracia, Ignacio

doi:10.1016/j.chemosphere.2003.10.047

Cited by 469 publications

(242 citation statements)

References 32 publications

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“…The high stability constant of organic Cr compounds results in stable complex formation between Cr and organic matter. 22 These results are consistent with the findings from sediments of the Tietê-Pinheiros river system in São Paulo state where the metals are associated to a large degree with reactive forms such as sulfides and carbonates, or adsorbed to amorphous oxyhydroxides of Fe and Mn. 17 The highest amount of Cu was found in the residual fractions of the sample collected from the downstream point on the Uberabinha River (42 mg kg -1 ) indicating that this metal was strongly associated with the crystalline structures of the sediments.…”

Section: Metal Speciationsupporting

confidence: 82%

Metal speciation in surface sediments of the Uberabinha river in Uberlândia, MG State, Brazil

Silva

Coelho

Rosolen

et al. 2011

J. Braz. Chem. Soc.

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O procedimento de extração em três etapas sequenciais recomendado pelo Programa de Normas Europeias de Medições e Ensaios (SM&T), anteriormente nomeado por Gabinete Comunitário de Referência (BCR), foi aplicado para a especiação química de metais pesados (Cu, Pb, Cr e Zn) em sedimentos provenientes de diferentes regiões urbanizadas da Cidade de Uberlândia (MG, Brasil). Para obter o balanço de massa, uma quarta etapa, ou seja, a digestão do resíduo foi realizada através do processo de digestão assistida por micro-ondas em meio ácido. Maiores concentrações dos elementos metálicos foram encontradas em pontos de amostragem que recebem descarga de uma área urbana e uma zona industrial. Todos os metais, exceto Zn, estavam presentes em maiores concentrações nas frações residuais (fortemente associados com as estruturas cristalinas dos minerais), indicando que Cu, Pb e Cr foram menos móveis e potencialmente menos biodisponíveis nesses sedimentos. Em sedimentos de zonas de descargas industriais e urbanas, a sequência de mobilidade dos metais estudados foi Pb > Zn > Cu > Cr. Maiores concentrações de Pb foram encontradas nas frações residuais no ponto de amostragem localizado no afluente que drena a zona industrial (102 mg kg -1 ), indicando que este elemento metálico foi fortemente ligado aos sedimentos. Portanto, sob os pontos de vista toxicológico e ambiental, o Pb não causa impacto ao meio ambiente e consequentemente à saúde humana. A soma das quatro frações (solúvel em ácido, redutível, oxidável e residual) apresentou boa concordância com o teor total, o que comprova a exatidão do procedimento de extração por micro-ondas em conjunto com o método analítico FAAS.A three-step sequential extraction procedure recommended by the European Standards, Measurements and Testing (SM&T) Program, formerly the Community Bureau of Reference (BCR), was applied to the chemical speciation of heavy metals (Cu, Pb, Cr and Zn) in sediments from different populated zones of Uberlândia City (MG State, Brazil). To obtain a mass balance, a fourth step, i.e., digestion and analysis of the residue, was performed using a microwave-assisted acid digestion procedure. The highest metallic elements concentrations were observed at one of the sampling points which receive discharge from an urban area and an industrial zone. All metals, except Zn, were present at higher concentrations in the residual fractions (strongly associated with the crystalline structures of the minerals) indicating that Cu, Pb and Cr were less mobile and potentially less bioavailable in these sediments. In sediments from industrial and urban discharge zones the mobility sequence of the heavy metals studied was Pb > Zn > Cu > Cr. The highest Pb concentrations were found in the residual fractions at the sampling point located in the tributary stream that drains the industrial district (102 mg kg -1 ), indicating that this metallic element was strongly bound to the sediments. Therefore, under the contamination and toxicological point of view, Pb has no impact to the environment and...

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Section: Metal Speciationsupporting

confidence: 82%

Metal speciation in surface sediments of the Uberabinha river in Uberlândia, MG State, Brazil

Silva

Coelho

Rosolen

et al. 2011

J. Braz. Chem. Soc.

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“…However, to assess the environmental impact of contaminated sediments, information on total concentrations is not sufficient and particular interest is the fraction of the total heavy metal content that may take part in further biological processes (Jain, 2004;Nwuche and Ugoji, 2008). The overall behavior of heavy metals in an aquatic environment is strongly influenced by the associations of metals with various geochemical phases in sediments (Morillo et al, 2004). Geochemical distribution results have also been used as an aid in predicting potential contaminant mobility and bioavailability (Kabala and Singh, 2001;Pueyo et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Heavy metals contamination in water and sediments of an urban river in a developing country

Mohiuddin

Ogawa

Zakir

et al. 2011

Int. J. Environ. Sci. Technol.

196

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Water and sediment samples were collected from 20 location of the Buriganga river of Bangladesh during Summer and Winter 2009 to determine the spatial distribution, seasonal and temporal variation of different heavy metal contents. Sequential extraction procedure was employed in sediment samples for the geochemical partitioning of the metals. Total trace metal content in water and sediment samples were analyzed and compared with different standard and reference values. Concentration of total chromium, lead, cadmium, zinc, copper, nickel, cobalt and arsenic in water samples were greatly exceeded the toxicity reference values in both season. Concentration of chromium, lead, copper and nickel in sediment samples were mostly higher than that of severe effect level values, at which the sediment is considered heavily polluted. On average 72 % chromium, 92 % lead, 88 % zinc, 73 % copper, 63 % nickel and 68 % of total cobalt were associated with the first three labile sequential extraction phases, which portion is readily bioavailable and might be associated with frequent negative biological effects. Enrichment factor values demonstrated that the lead, cadmium, zinc, chromium and copper in most of the sediment samples were enriched sever to very severely. The pollution load index value for the total area was as high as 21.1 in Summer and 24.6 in Winter season; while values above one indicates progressive deterioration of the sites and estuarine quality. The extent of heavy metals pollution in the Buriganga river system implies that the condition is much frightening and may severely affect the aquatic ecology of the river.

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“…Because they are nondegradability and bio-concentration and bio-magnify, heavy metals and metalloid pose an ecological risk to organisms and ecosystems (Lai et al 2005;Townsend et al 2013). Sediments are a significant reservoir and source of metals in the aquatic environment and mediate transport and storage of hazardous metals (Guevara et al 2005;Moriilo et al 2004). The concentration of heavy metals and metalloid in sediments from polluted aquatic environments may be hundreds or even tens of thousands of times greater than sediments from non-polluted aquatic environments (Wang et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Speciation and ecological risk of heavy metals and metalloid in the sediments of Zhalong Wetland in China

Zang

Xiao

et al. 2013

Int. J. Environ. Sci. Technol.

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A total of 271 sediments samples from the Zhalong Wetland were analyzed for concentration and distribution of Hg, Cd, As, Cu, Pb, Zn, Cr, and Zn; their speciation according to the modified European Community Bureau of Reference sequential extraction procedures and their ecological risk based on Lars Hakanson's potential ecological risk assessment and risk assessment code were made. The results can be summarized as the followings: (1) Concentrations of all metals measured were above soil background values of Songnen Plain, and their spatial distributions were distinctly different. The concentrations of metals (except Pb) were high in the east, followed by the north, and were relatively low in the core zone and south. The concentration of Pb was high in the north, south, and west, compared with low concentration in the core zone and east. (2) The dominant proportion of Pb, Zn, and Cr was in the residual fraction, suggesting that they were environmental stable. The concentrations of Cu and As in the reducible fraction, the concentration of Cd in the acidsoluble fraction, and the concentration of Hg in the oxidizable fraction were relatively high, indicating they had greater environmental effects. (3) The evaluation of the ecological risk showed that Cd, Hg, and As had relatively high ecological risk index, especially the ecological risk of Cd should be paid attention to. In general, the ecological risk of the heavy metals and metalloid by zone was experimental zone [ buffering zone [ ecological tourism zone [ core zone.

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Heavy metal distribution in marine sediments from the southwest coast of Spain

Cited by 469 publications

References 32 publications

Metal speciation in surface sediments of the Uberabinha river in Uberlândia, MG State, Brazil

Metal speciation in surface sediments of the Uberabinha river in Uberlândia, MG State, Brazil

Heavy metals contamination in water and sediments of an urban river in a developing country

Speciation and ecological risk of heavy metals and metalloid in the sediments of Zhalong Wetland in China

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