The effects of different coatings on zinc oxide nanoparticles and their influence on dissolution and bioaccumulation by the green alga, C. reinhardtii

Merdzan, Vladimir; Domingos, Rute F.; Monteiro, Carolino; Hadioui, Madjid; Wilkinson, Kevin J.

doi:10.1016/j.scitotenv.2014.04.094

Cited by 49 publications

(34 citation statements)

References 39 publications

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“…Although a major fraction of the ENMs entering WWTPs are removed during the primary and secondary treatment processes via the wastewater sludge, a small portion (5-15%) still may end up in surface waters, such as lakes and rivers, through the discharge of liquid effluent [20]. The possibility of increased nanomaterial exposure due to the discharge of wastewater sludge also cannot be disregarded, since the resulting biosolids containing ENMs can end up in landfills and incineration plants and may thus pose an ecological threat [8,21]. Indeed, a recent study has shown that the incineration process can convert the Ag…”

Section: Wastewater Effluents As An Exposure Pathway For Silver Nanopmentioning

confidence: 99%

“…Therefore, a semi-quantitative approach, where a (cat)ion-exchange resin was coupled to the SP-ICP-MS (IET-SP-ICP-MS) [21], was employed in order to further discriminate among Ag species in the dissolved fraction (i.e., <16 nm). The underlying assumption was that strong Ag complexes, anionic complexes and small NPs would pass through the resin column without being involved in the ion-exchange, whereas free Ag + and labile Ag complexes would exchange with the counter-ions present on the resin.…”

Section: Characterization Of Dissolved Agmentioning

confidence: 99%

“…Any change in the physicochemical state of the NP will in turn likely impact its potential toxicity, as the bioavailability depends on chemical speciation (complexation and oxidation number), diffusive fluxes (related to NP size) and particle coating [21][22][23]. In a biochemically rich matrix of wastewater, Ag NPs may easily be transformed into numerous chemical species, including free Ag and Ag complexes, Ag2O, Ag2S…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Wastewater Effluents As An Exposure Pathway For Silver Nanopmentioning

confidence: 99%

Section: Characterization Of Dissolved Agmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Azimzada

Tufenkji

Wilkinson

2017

Environ. Sci.: Nano

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“…[36,37,39] Stable surface coatings, binding of molecules from the test media or exudates from the organism, or aggregation of NMs can block exposed NM surfaces, potentially reducing dissolution rates. [40] In contrast, elevated temperatures [41] and low pH [36,38,42] tend to increase the rate of dissolution of metals and metal oxides. Media composition will also affect dissolution whereby constituents may complex dissolved metals, compete for binding sites on an organism [42] or form a surface coating on the NMs themselves, thereby abrogating toxic effects.…”

Section: Dissolution Of Nmsmentioning

confidence: 99%

Aquatic toxicity of manufactured nanomaterials: challenges and recommendations for future toxicity testing

et al. 2014

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Environmental context. The increased use of nanomaterials in industrial and consumer products requires robust strategies to identify risks when they are released into the environment. Aquatic toxicologists are beginning to possess a clearer understanding of the chemical and physical properties of nanomaterials in solution, and which of the properties potentially affect the health of aquatic organisms. This review highlights the main challenges encountered in aquatic nanotoxicity testing, provides recommendations for overcoming these challenges, and discusses recent studies that have advanced our understanding of the toxicity of three important OECD nanomaterials, titanium dioxide, zinc oxide and silver nanomaterials.Abstract. Aquatic nanotoxicologists and ecotoxicologists have begun to identify the unique properties of the nanomaterials (NMs) that potentially affect the health of wildlife. In this review the scientific aims are to discuss the main challenges nanotoxicologists currently face in aquatic toxicity testing, including the transformations of NMs in aquatic test media (dissolution, aggregation and small molecule interactions), and modes of NM interference (optical interference, adsorption to assay components and generation of reactive oxygen species) on common toxicity assays. Three of the major OECD (Organisation for Economic Co-operation and Development) priority materials, titanium dioxide (TiO 2 ), zinc oxide (ZnO) and silver (Ag) NMs, studied recently by the Natural Sciences and Engineering Research Council of Canada (NSERC), National Research Council of Canada (NRC) and the Business Development Bank of Canada (BDC) Nanotechnology Initiative (NNBNI), a Canadian consortium, have been identified to cause both bulk effect, dissolution-based (i.e. free metal), or NM-specific toxicity in aquatic organisms. TiO 2 NMs are most toxic to algae, with toxicity being NM size-dependent and principally associated with binding of the materials to the organism. Conversely, dissolution of Zn and Ag NMs and the subsequent release of their ionic metal counterparts appear to represent the primary mode of toxicity to aquatic organisms for these NMs. In recent years, our understanding of the toxicological properties of these specific OECD relevant materials has increased significantly. Specifically, researchers have begun to alter their experimental design to identify the different behaviour of these materials as colloids and, by introducing appropriate controls and NM characterisation, aquatic nanotoxicologists are now beginning to possess a clearer understanding of the chemical and physical properties of these materials in solution, and how these materials may interact with organisms. Arming nanotoxicologists with this understanding, combined with knowledge of the physics, chemistry and biology of these materials is essential for maintaining the accuracy of all future toxicological assessments.

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“…By using ZnO NPs manufactured with different stabilizers Merdzan at al. (Merdzan et al 2014) showed that the dynamic speciation of the particles and released soluble Zn was dependent on the stabilizer type. The free Zn concentration was dependent on the binding capacity of the oxide surface and/or stabilized used; for the bare oxide free Zn concentration was approximately the same has the solubilized one, while for the stabilized particles was considerable lower.…”

Section: Introductionmentioning

confidence: 99%

The role of charged polymer coatings of nanoparticles on the speciation and fate of metal ions in the environment

Domingos

Franco

Pinheiro

2014

Environ Sci Pollut Res

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Determining the environmental risk of metals requires an in-depth understanding of the environmental matrices composition, which currently also includes the presence of manufactured metallic nanoparticles (NPs) usually, stabilized by a polymer surface coating. As a consequence, is necessary to take into account effects of the NP core, the polymer surface coating and their mutual interaction as well as with other environmental components. The release of metal ions from metallic NPs is a well-known outcome, however, the effect of the presence of the NP polymer coating in the NPs solubilization mechanism is not well understood. In this study the dynamic speciation of Cd and Pb in presence of a polyacrylic acid (PAA)-stabilized CdTe/CdS NP was quantified by scanned stripping chronopotentiometry (SSCP). It was found that although the NP solubility was 5.8× larger at pH 8.5 than at pH 6.0, the amount of free Cd ions was much smaller (2.4 % at pH 8.5 vs. 57 % at pH 6.0). The concentration of free Cd and Pb ions in solution was larger in presence of the PAA-shells than when in presence of the same amount of polymer but when this is at the surface of the NP. This effect is attributed to the metal ions interaction with the particle itself. The effect is notably larger for Pb ions and might results from the exchange of Cd by Pb ions at the particle surface since PbS is less soluble than CdS.

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The effects of different coatings on zinc oxide nanoparticles and their influence on dissolution and bioaccumulation by the green alga, C. reinhardtii

Cited by 49 publications

References 39 publications

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

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

Aquatic toxicity of manufactured nanomaterials: challenges and recommendations for future toxicity testing

The role of charged polymer coatings of nanoparticles on the speciation and fate of metal ions in the environment

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