Trace metal concentrations in aquatic invertebrates: why and so what?

Rainbow, Philip S.

doi:10.1016/s0269-7491(02)00238-5

Cited by 1,046 publications

(696 citation statements)

References 48 publications

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“…e locais (temperatura, salinidade, sazonalidade, etc.) 3,28 . Para os humanos, essa incorporação pode variar de acordo com o tipo étnico, idade, sexo, local de residência (área urbana ou rural, poluída ou não), número de fontes de contaminação ao qual a população está exposta (ar, água, alimento, solo, utensílio, cigarro, etc.…”

Section: Contribuição Do Consumo De Carne De Siri Na Ingestão Diáriaunclassified

Avaliação de contaminação por metais pesados em amostras de siris azuis

Virga¹,

Geraldo²,

Santos³

2007

Ciênc. Tecnol. Aliment.

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ResumoMetais pesados por não serem biodegradáveis podem se acumular nos tecidos vivos ao longo da cadeia alimentar chegando ao ser humano principalmente por meio da alimentação. Siris e outros organismos que se alimentam de matéria orgânica existente em sistemas aquáticos, podem absorver uma carga maior destes elementos tóxicos e assim, representar um risco potencial à saúde da população da região. Neste trabalho, foram realizados estudos quantitativos sobre o teor de Pb, Cd, Cr, Zn e Cu em amostras (n = 144) de siris azuis do gênero Callinectes sp., coletados ao longo do rio Cubatão, utilizando um Espectrofotômetro de Absorção Atômica por Chama (FSAA). Exceto para o Cr, onde o valor médio obtido neste trabalho ficou acima do estabelecido para qualquer tipo de alimento pela legislação brasileira, todos os outros resultados estiveram abaixo dos limites máximos recomendados por agências de saúde. Uma discussão é apresentada sobre a contribuição ao valor provisório de ingestão diária tolerável (PTDI), sugerido pela Organização Mundial de Saúde, devido ao consumo de carne de siri pela população. Palavras-chave: metal pesado; contaminação; siri-azul; Callinectes sp.; espectrometria por absorção atômica. AbstractBecause they are nonbiodegradable, heavy metals can accumulate in the living tissues along the food chain, reaching humans mainly through food. Swimming crabs and other organisms which feed on organic matter that is present in aquatic systems can ingest high loads of these toxic elements; hence, they pose a potential risk to the health of regional populations. This work involved a quantitative analysis of Pb, Cd, Cr, Zn and Cu in blue crab specimens of the genus Callinectes sp. (n = 144) collected along the Cubatão river, using Flame Atomic Absorption Spectrophotometry (FAAS). Except for Cr, whose average value exceeded the limit allowed for any type of food by Brazilian regulations, all the other elements fell below the maximum content recommended by health agencies. This paper also discusses the contribution of crab meat consumed by the population to the provisional tolerable daily intake (PTDI) suggested by the World Health Organization.

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Section: Contribuição Do Consumo De Carne De Siri Na Ingestão Diáriaunclassified

Avaliação de contaminação por metais pesados em amostras de siris azuis

Virga¹,

Geraldo²,

Santos³

2007

Ciênc. Tecnol. Aliment.

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“…Accumulated metals in aquatic organisms can provide valuable information on metal bioavailability in the aquatic environment (Rainbow, 2002;Bervoets et al, 2005). However, total concentrations of accumulated metals in the tissues do not always give a reliable indication of metal toxicity (Cain et al, 2004;Vijver et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…To regulate the internal availability of essential metals for metabolic functions and to avoid inappropriate binding of essential and non-essential metals to important bio-molecules, various sub-cellular systems have evolved. With this, essential metals in excess of metabolic requirements and non-essential metals are detoxified and/or excreted (Rainbow, 2002;Campbell et al, 2005Campbell et al, , 2008. Excess of metals can be bound to the metal binding protein metallothionein (Vijver et al, 2004;Van Campenhout et al, 2008) and (subsequently) immobilized within granules (Marigómez et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Differences in metal sequestration between zebra mussels from clean and polluted field locations

et al. 2009

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a b s t r a c tOrganisms are able to detoxify accumulated metals by, e.g. binding them to metallothionein (MT) and/or sequestering them in metal-rich granules (MRG). The different factors involved in determining the capacity or efficiency with which metals are detoxified are not yet known.In this work we studied how the sub-cellular distribution pattern of cadmium, copper and zinc in whole tissue of zebra mussels from clean and polluted surface waters is influenced by the total accumulated metal concentration and by its physiological condition. Additionally we measured the metallothionein concentration in the mussel tissue. Metal concentration increased gradually in the metal-sensitive and detoxified sub-cellular fractions with increasing whole tissue concentrations. However, metal concentrations in the sensitive fractions did not increase to the same extent as metal concentrations in whole tissues. In more polluted mussels the contribution of MRG and MT became more important. Nevertheless, metal detoxification was not sufficient to prevent metal binding to heat-sensitive low molecular weight proteins (HDP fraction). Finally we found an indication that metal detoxification was influenced by the condition of the zebra mussels. MT content could be explained for up to 83% by variations in Zn concentration and physiological condition of the mussels.

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“…The accumulated trace metals in an aquatic invertebrate can be interpreted in terms of metabolically available and detoxified forms of metals (Rainbow, 2002). Heavy metals are more concentrated in the gills and in the viscera than in the mantle and adductor muscle of mussels (Denton and BurdonJones, 1981).…”

Section: Introductionmentioning

confidence: 99%