Influence of Metal Speciation in Natural Freshwater on Bioaccumulation of Copper and Zinc in Periphyton:  A Microcosm Study

Meylan, Sébastien; Behra, Renata; Sigg, Laura

doi:10.1021/es034993n

Cited by 96 publications

(85 citation statements)

References 41 publications

(54 reference statements)

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“…In contrast to this assumption, several examples in both defined media and natural waters have been documented for which the mass transport of the metal to the cell surface is the rate-limiting step. [60][61][62] In these cases, biologically reactive metal species (e.g. free M zþ ) are depleted in the diffusion layer next to the organism.…”

Section: (4) Dissociation Of Labile Metal Complexesmentioning

confidence: 99%

When are metal complexes bioavailable?

Zhao¹,

Campbell²,

Wilkinson³

2016

Environ. Chem.

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Environmental context. The concentration of a free metal cation has proved to be a useful predictor of metal bioaccumulation and toxicity, as represented by the free ion activity and biotic ligand models. However, under certain circumstances, metal complexes have been shown to contribute to metal bioavailability. In the current mini-review, we summarise the studies where the classic models fail and organise them into categories based on the different uptake pathways and kinetic processes. Our goal is to define the limits within which currently used models such as the biotic ligand model (BLM) can be applied with confidence, and to identify how these models might be expanded.Abstract. Numerous data from studies over the past 30 years have shown that metal uptake and toxicity are often best predicted by the concentrations of free metal cations, which has led to the development of the largely successful free-ion activity model (FIAM) and biotic ligand model (BLM). Nonetheless, some exceptions to these classical models, showing enhanced metal bioavailability in the presence of metal complexes, have also been documented, although it is not yet fully understood to what extent these exceptions can or should be generalised. Only a few studies have specifically measured the bioaccumulation or toxicity of metal complexes while carefully measuring or controlling metal speciation. Fewer still have verified the fundamental assumptions of the classical models, especially when dealing with metal complexes. In the current paper, we have summarised the exceptions to classical models and categorised them into five groups based on the fundamental uptake pathways and kinetic processes. Our aim is to summarise the mechanisms involved in the interaction of metal complexes with organisms and to improve the predictive capability of the classic models when dealing with complexes.

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Section: (4) Dissociation Of Labile Metal Complexesmentioning

confidence: 99%

When are metal complexes bioavailable?

Zhao¹,

Campbell²,

Wilkinson³

2016

Environ. Chem.

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“…Supernatants were discarded and pellets were frozen and stored at -80°C for further use. Metal accumulated in the biofilms was measured according to Meylan et al (2004). Aliquots of biofilm suspensions (approximately 20 ml) were filtered on 0.45 lm PES filters (47 mm diameter, Sartorius Biolab Products, Sartorius Stedim Biotech, Germany) previously washed by immersion in 10% HNO 3 (suprapure, Merck, France) for 48 h and then rinsed twice with ultrapure water.…”

Section: General Biofilm Parametersmentioning

confidence: 99%

Low exposure levels of urban metals induce heterotrophic community tolerance: a microcosm validation

2011

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The biological response of periphyton chronically exposed to metals of urban origin (Cd, Ni and Zn) was investigated with a Pollution-Induced Community Tolerance (PICT) approach using a previously developed short-term toxicity test based on β-glucosidase (heterotrophic) activity. Periphyton was grown on plastic membranes immersed in indoor aquaria contaminated with metals at realistic contamination levels (0.3, 3 μg/l for Cd, 5, 50 μg/l for Ni, 20, 200 μg/l for Zn). After 3 weeks of exposure, biofilms' parameters (dry-weight, chlorophyll a concentration, heterotrophic activity) were analyzed and tolerance acquisition of the heterotrophic communities was assessed using the toxicity test. Modifications of bacterial and eukaryotic community structure were assessed with Automated Ribosomal Intergenic Spacer Analysis (ARISA). Effects of metal exposure were observed on biofilms parameters in the Cd and Zn experiments. Tolerance levels increased for both Cd-exposed biofilms, and for the high metal treatment biofilms in the Ni and Zn experiments. Analysis of the ARISA profiles showed that metal exposure affected the structure of both bacterial and eukaryotic communities. Moreover, Cd tolerance of the Zn-exposed heterotrophic communities was evaluated, which showed that the Zn-tolerant community (high metal treatment in the Zn experiment) also became tolerant to Cd (co-tolerance). The study shows that tolerance acquisition can be detected after exposure to environmental metal concentrations using β-glucosidase activity as an endpoint in short-term toxicity tests.

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“…Benthic organisms (e.g., periphyton, aquatic insects) are likely to be the most directly affected by metal concentrations in the sediments because benthic organisms are the ultimate repositories of particulate materials that are washed into aquatic systems (Hare and Tessier 1996;Behra et al 2002;Meylan et al 2004). In fish, the embryonic and larval stages are usually the most sensitive to metals.…”

Section: Regardless Of Whether or Not The Observations Differmentioning

confidence: 99%

Watershed land use as a determinant of metal concentrations in freshwater systems

Das

Nordin

2009

Environ Geochem Health

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Concentrations of Fe, Mn, Cu, dissolved organic matter (DOM), and pH were synthesized from 30 publications to determine the factors regulating concentrations and behavior of metals in freshwater systems. Results from the review suggest that contrasting watershed land use can directly (erosion and runoff) and indirectly (in-lake processes including metal-DOM-pH interactions) affect the metal concentrations in freshwater systems. Among the watershed land uses considered here, concentrations of Fe, Mn, and Cu were observed in the following order: arctic lakes < forested < agricultural < urbanized < mined. A drastic difference in mean metal concentrations has been observed when undisturbed or low impact watersheds (arctic and forested) were changed by agricultural, urban, and mining developments. Relationships between metal concentrations and pH revealed that metals precipitate at high pH (pH > 5). Additionally, at pH < 5, metal concentrations were significantly correlated with DOM due to metal-DOM complexation. High ratios of metal: DOM occur only at low DOM concentrations. Collectively, two general conclusions can be drawn from this review. First, lakes, rivers, and streams with urbanized watersheds are the most susceptible to increased concentrations of metals. Secondly, these results also suggest that regardless of high or low DOM in the water column, pH would affect metal concentrations in freshwater systems. Nonetheless, free metal ions would be higher in freshwater systems with acidic water and low DOM.

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Influence of Metal Speciation in Natural Freshwater on Bioaccumulation of Copper and Zinc in Periphyton: A Microcosm Study

Cited by 96 publications

References 41 publications

When are metal complexes bioavailable?

When are metal complexes bioavailable?

Low exposure levels of urban metals induce heterotrophic community tolerance: a microcosm validation

Watershed land use as a determinant of metal concentrations in freshwater systems

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