Relationships between the Partitioning of Trace Metals in Sediments and Their Accumulation in the Tissues of the Freshwater Mollusc <i>Elliptio complanata</i> in a Mining Area

Tessier, André; Campbell, Peter G. C.; Auclair, J. L.; Bisson, M.

doi:10.1139/f84-180

Cited by 258 publications

(127 citation statements)

References 20 publications

(8 reference statements)

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“…Higher bioavailability of Cd with increasing partitioning in the easily exchangeable phase indicates that Cd assimilation is probably controlled by desorption within the animal gut. Consistent with findings in other studies (Tessier et al 1984, 1993, Bryan & Langston 1992, Thomas & BendellYoung 1998, binding with the reducible phase inhibits Cd bioavailability to the animals, likely caused by its competitive binding with Fe for ligands available in the gut. The influence of sediment geochemistry on Cr and Zn assimilation by the sipunculids remains unclear.…”

Section: Discussionsupporting

confidence: 90%

Bioavailability of sedimentary metals from a contaminated bay

Wang¹,

Qu²,

Fan³

et al. 2002

Mar. Ecol. Prog. Ser.

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Sediments are considered the sink for metals in aquatic environments because of their strong metal-binding capacity, but they are a potential source for metal ingestion by marine benthic animals as well. Sediment contamination is now a major environmental problem in many countries, including China. This study examines the bioavailability to a marine suspension-feeder (the clam Mactra veneriformis) and a deposit-feeder (the peanut worm Sipunculus nudus) of sediment-bound Cd, Cr and Zn along a gradient of metal contamination. To this end, metal assimilation efficiency and metal extraction by gut juice were quantified and compared. Metal concentrations in sediments collected from 4 sites were 5.40 to 43.7 mg Cd kg Metal assimilation by the clams was independent of the metal concentration in the sediment. In the deposit-feeding sipunculid, the bioavailability of sediment-bound Cd increased with increasing contamination of the sediment, as a result of the increasing partitioning of Cd into the easily exchangeable phase, and decreasing partitioning into the reducible phase. Cd assimilation also increased with increasing total organic carbon content in the sediments.The Cd assimilation efficiency was directly correlated to Cd extraction by gut juices collected in vitro from the peanut worm. No such relationship was found for Cr and Zn. Geochemical and biological controls on metal bioavailability therefore differ between the metals and with the extent of sediment contamination. The limitation of the radiotracer technique to quantify metal assimilation efficiency by marine benthic invertebrates from sediments should be recognized when it is used to predict metal concentrations in target animals.KEY WORDS: Metal · Bioavailability · Contamination · Sediment · Sipuncula · ClamsResale or republication not permitted without written consent of the publisher

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Section: Discussionsupporting

confidence: 90%

Bioavailability of sedimentary metals from a contaminated bay

Wang¹,

Qu²,

Fan³

et al. 2002

Mar. Ecol. Prog. Ser.

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“…Isso ocorre, principalmente em decorrência do tamanho, idade e outros fatores fisiológicos dos bivalves analisados, como relatado na literatura especializada. 4,5 As concentrações de Pb detectadas nos tecidos dos bivalves coletados em Iporanga (4,53 µg/g) e Sete Barras (3,77 µg/g) ultrapassam os limites máximos de tolerância para contaminantes inorgânicos em peixes e produtos de pesca estabelecidos pela legislação brasileira, valor de referência definido pela Portaria 658/98 da ANVISA, 7 equivalente a 2,0 µg/g para este metal pesado. esse padrão de referência foi empregado como indicativo de possível contaminação, tendo certa restrição quanto ao uso deste em face do mesmo ser empregado genericamente e não especificamente para os bivalves da espécie Corbicula fluminea, existindo variabilidade das condições fisiológicas dos organismos e dos parâmetros físico-químicos do ambiente.…”

Section: Resultsunclassified

Detecção de contaminantes em espécie bioindicadora (Corbicula fluminea) - Rio Ribeira de Iguape - SP

Guimarães¹,

Sígolo²

2008

Quím. Nova

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Recebido em 17/10/07; aceito em 4/4/08; publicado na web em 4/9/08 DectectIoN oF coNtAMINANtS IN A BIoINDIcAtoR SPecIeS (Corbicula fluminea) -RIBeIRA De IGUAPe RIVeR, SAo PAULo StAte. the study assessed heavy metal concentrations in the tissue samples of Corbicula fluminea, by IcP-oeS. In the tissues, average levels of 23.99 µg/g of cu, 144.21 µg/g of Zn, 0.71 µg/g of cd, 7.10 µg/g of cr and 2.41 µg/g of Pb were detected ahowing that this last value is high and above the ANVISA reference (2.00 µg/g) for fish and other products. the results suggest that natural processes occuring in the Ribeira de Iguape River are not sufficient for purification so that metals remain in the water and can accumulate in the trophic chain.

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“…15 A biota tornou-se uma importante ferramenta em programas de monitoramento ambiental, uma vez que a biodisponibilidade dos contaminantes é medida diretamente. Moluscos bivalves têm sido extensivamente empregados na avaliação da contaminação de ambientes aquáticos [16][17][18][19][20] por metais e outros contaminantes, pois fornecem informações robustas e integradas sobre o impacto ambiental e biodisponibilidade de tais elementos. Esses organismos são adequados como monitores biológicos de áreas contaminadas, pois eles são: sésseis, filtradores, de fácil coleta, estão presente ao longo de todo o ano e respondem rapidamente às variações das concentrações de metais biodisponíveis no meio.…”

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