Metals and organic contaminants in bivalve molluscs

Wang, Wen‐Xiong

doi:10.1533/9781845695576.2.228

Cited by 7 publications

(2 citation statements)

References 68 publications

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“…Bioaccumulation of metals by marine bivalves has been studied extensively, primarily because many bivalves, such as mussels and oysters, are used as global biomonitors of environmental contamination. The biokinetics of metals have been quantified in many bivalve species using well‐established radiotracer techniques . The vast majority of these earlier measurements focused on uncontaminated bivalves or bivalves that were previously exposed to metals under laboratory conditions .…”

Section: Introductionmentioning

confidence: 99%

Depuration of metals by the green-colored oyster Crassostrea sikamea

Wang

2014

Environmental Toxicology and Chemistry

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The accumulation of metals (especially copper) in oysters has led to green-color now being found in Chinese estuaries. In the present study, the authors quantified the depuration of 8 metals (Ag, Cd, Co, Cr, Cu, Ni, Pb, and Zn) in green-colored oysters (Crassostrea sikamea) collected from an estuary that is heavily contaminated by metals as a result of industrial effluent releases. The oysters were depurated under laboratory conditions for 4 mo; the accumulated concentrations and the subcellular distribution of metals were measured at different time intervals. Results showed that the green color of oysters faded to light yellow (nearly normal) after 4 mo of depuration. Depuration of metals could be described by a first-order kinetic process. The calculated overall depuration rate constants of metals were in the range of 0.008 d(-1) to 0.024 d(-1) , with a biological retention half-life of 30 d to 70 d. The depuration rates of green-colored contaminated oysters were significantly higher for Cd, Cu, Cr, and Ni than the rates of oysters from a less contaminated site, whereas the depuration rates of Ag, Co, Pb, and Zn were comparable between the 2 populations. When corrected for the change of oyster tissue weight, the actual efflux rate constants of the metals (0.0708-0.1014 d(-1) ) were much higher than the overall depuration rate constants. Cellular debris and metallothionein-like proteins were the important fractions binding with the metals in the oysters. Significant changes in metal subcellular distribution were observed during the 4-mo depuration for Ag, Cd, Cu, and Zn. Metallothionein-like protein became more important in sequestering the metals during the depuration period, with a concomitant decrease in metals associated with the cellular debris fraction.

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Section: Introductionmentioning

confidence: 99%

Depuration of metals by the green-colored oyster Crassostrea sikamea

Wang

2014

Environmental Toxicology and Chemistry

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“…These authors suggest that U. pictorum responds to elevated concentrations of ammonia by reducing its filtering activity; thus, reducing the exposure to ammonia. In addition, reduced ventilation activity has been reported by Wang (2009) as a response of the green mussel Perna viridis to the exposure to metals under different hypoxic and anoxic conditions. Lowered ventilation rate can result in the activation of anaerobic metabolism.…”

Section: Discussionmentioning

confidence: 99%

In situ experiment to evaluate biochemical responses in the freshwater mussel Diplodon chilensis under anthropogenic eutrophication conditions

Yusseppone

Bianchi

Castro

et al. 2020

Ecotoxicology and Environmental Safety

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Levels of PAHs, PCBs, and toxic metals in Ruditapes philippinarum and Donax trunculus in Marmara Sea, Turkey

Künili

Çolakoğlu

2020

J Sci Food Agric

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BACKGROUNDThe manila clam Ruditapes philippinarum and the wedge clam Donax trunculus are economic bivalve species which constitute an important part of the natural bivalve beds in the Marmara Sea, Turkey. Toxic chemicals such as, dioxins, dioxin‐like polychlorinated biphenyls (PCBs), polycyclic hydrocarbons (PAHs), and toxic metals are recognized as important health risk factors that threaten public health via food or directly in the environment. In the present study, we aimed to determine and monitor levels of these toxic chemicals in both clam species, R. philippinarum and D. trunculus, between 2013 and 2017.RESULTSAccording to the results, maximum levels of dioxins, PAHs, and toxic metals (lead, cadmium, mercury) during the period were determined as 0.18 pg g−1, 2.43 mg kg−1, and 0.44–0.53‐0.1 mg kg−1, respectively. The level of contaminants in both clam species were determined to be below the threshold or tolerable daily intake values established by the European Commission, European Food Safety Authority (EFSA), and Food and Agriculture Organization/World Health Organization (FAO/WHO). Seasonal fluctuations were observed to be similar in both species and also in seasons, but elevated levels of PCBs and PAHs were detected in warmer months during the period.CONCLUSIONAs a consequence, toxic chemicals in both clam species were found at low concentrations in this study from the point of view of public health concerns; however, the contaminants should be closely monitored in the future due to their elevated levels in samples. © 2020 Society of Chemical Industry

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Metals and organic contaminants in bivalve molluscs

Cited by 7 publications

References 68 publications

Depuration of metals by the green-colored oyster Crassostrea sikamea

Depuration of metals by the green-colored oyster Crassostrea sikamea

In situ experiment to evaluate biochemical responses in the freshwater mussel Diplodon chilensis under anthropogenic eutrophication conditions

Levels of PAHs, PCBs, and toxic metals in Ruditapes philippinarum and Donax trunculus in Marmara Sea, Turkey

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