Critical Evaluation of Physicochemical Parameters and Processes for Modelling the Biological Uptake of Trace Metals in Environmental (Aquatic) Systems

Wilkinson, Kevin J.; Buffle, Jacques

doi:10.1002/0470094044.ch10

Cited by 96 publications

(129 citation statements)

References 243 publications

(448 reference statements)

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“…They a Thus, different species of bacteria displayed differen sorptive relationships. The obtained biosorption data are in good agreement with the literature data according to which biological ligands are generally polyfunctional polyelectrolytic, with an average pK value within 6.0 [28].…”

Section: Resultssupporting

confidence: 88%

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

Gelagutashvili¹

2013

OJMetal

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Biosorption of Cd(II), Ag(I) and Au(III) by cyanobacteria Spirulina platensis, of Au(II)-by Streptomyces spp. 19H, and of Cr(VI) and Cr(III)-by Arthrobacter species was studied by using the dialysis and atomic absorption analysis under various conditions. In particular, the impact of the following parameters on biosorption was studied: pH (for Ag, Cd, Au), living and non-living cells (for Cr), heavy metal valence (for Cr), homogenized and non-homogenized cells (for Au), Zn(II) ions (on Cr(VI)-Arthrobacter species). It was shown that biosorption efficiency of Cr(III), Cr(VI), Cd(II), Au(III) and Ag(I) ions is likely to depend on the type of bacteria used as well as on the conditions under which the uptake processes proceeded. It was shown that metal removal by microorganisms was influenced by physicalchemical parameters. The pH value of 7.0 was optimum for the removal of Ag(I) and Cd(II) by Spirulina platensis. At a low pH value of 5.5, Au (III) was by test algae more efficiently than Cd(II) and Ag(I).

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Section: Resultssupporting

confidence: 88%

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

Gelagutashvili¹

2013

OJMetal

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“…NPs that have been sulfidized in wastewater systems back to their original state, which may increase their environmental risk [22]. The implications related to the discharge of liquid effluents into surface waters can be direct and severe for aquatic organisms.…”

Section: Wastewater Effluents As An Exposure Pathway For Silver Nanopmentioning

confidence: 99%

Transformations of silver nanoparticles in wastewater effluents: links to Ag bioavailability

Azimzada

Tufenkji

Wilkinson

2017

Environ. Sci.: Nano

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As a result of the burgeoning nanotechnology industry, the number of uses of engineered silver nanoparticles (Ag NPs) in consumer products has risen significantly in recent years.Despite their utility as anti-bacterial agents, the 'nano-scale' properties of these materials may lead to eco-toxicological problems when they end up in the environment. Wastewater effluents represent one of the main routes through which Ag NPs can reach an aquatic environment, where they may potentially interact with aquatic life. However, in wastewaters, Ag NPs may undergo different chemical and physical transformations, which may alter the potential toxicity of these NPs towards aquatic organisms. The main objectives of this study are to characterize the Ag NPs in wastewater effluents and then to assess their interactions with a model organism, the green alga Chlamydomonas reinhardtii.Experiments were conducted to distinguish the effect(s) of the wastewater matrix on the dissolution of Ag NPs and to determine whether the transformed NPs or the dissolved Ag species would be most bioavailable to C. reinhardtii. It was shown that in environmental matrices such as wastewater, the bioavailability of Ag + could be significantly or completely reduced-a Nous avons étudié l'effet de la matrice des eaux usées sur la dissolution des Ag NPs et la biodisponibilité des différentes formes (particulaire et dissoute) des Ag NPs pour C. reinhardtii.Dans les matrices environnementales telles que les eaux usées la biodisponibilité de Ag + serait réduite de façon significative, si ce n'est complète; une conclusion qui va à l'encontre les résultats des études similaires faites dans des matrices biologiques simples. Cette réduction

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“…Interestingly, this implies that the bioavailability of Ag nanoparticles will be reduced in line with the reduction of their diffusive flux (which would scale with the reciprocal particle diameter). [73] Because organisms in biofilms and macro-organisms generally have less efficient mass transport than unicellular microorganisms (planar diffusion instead of radial diffusion), [74,75] they are also more likely to encounter diffusive limitation. Because labile complexes can contribute to metal uptake under a mass-transport limitation, equilibrium models (e.g.…”

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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Critical Evaluation of Physicochemical Parameters and Processes for Modelling the Biological Uptake of Trace Metals in Environmental (Aquatic) Systems

Cited by 96 publications

References 243 publications

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

Transformations of silver nanoparticles in wastewater effluents: links to Ag bioavailability

When are metal complexes bioavailable?

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