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Stability of Titanium Dioxide Nanoparticle Agglomerates in Transitional Waters and Their Effects Towards Plankton from Lagoon of Venice (Italy)

Perstrimaux, Clémentine ; Le Faucheur, Séverine ; Mortimer, Monika ; Stoll, Serge ; Aubry, Fabrizio ; Botter, Margherita ; Zonta, Roberto ; Slaveykova, Vera

In: Aquatic Geochemistry, 2015, vol. 21, no. 2-4, p. 343-362

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    Titre
    • Stability of Titanium Dioxide Nanoparticle Agglomerates in Transitional Waters and Their Effects Towards Plankton from Lagoon of Venice (Italy)
    Auteur
    • Perstrimaux, Clémentine. Environmental Biogeochemistry and Ecotoxicology, Faculty of Sciences, Institute F.-A. Forel, Earth and Environmental Sciences, University of Geneva, 10, route de Suisse, 1290, Versoix, Switzerland
    • Le Faucheur, Séverine. Environmental Biogeochemistry and Ecotoxicology, Faculty of Sciences, Institute F.-A. Forel, Earth and Environmental Sciences, University of Geneva, 10, route de Suisse, 1290, Versoix, Switzerland
    • Mortimer, Monika. Environmental Biogeochemistry and Ecotoxicology, Faculty of Sciences, Institute F.-A. Forel, Earth and Environmental Sciences, University of Geneva, 10, route de Suisse, 1290, Versoix, Switzerland
    • Stoll, Serge. Environmental Physical Chemistry, Faculty of Sciences, Institute F.-A. Forel, Earth and Environmental Sciences, University of Geneva, 10, route de Suisse, 1290, Versoix, Switzerland
    • Aubry, Fabrizio. Istituto di Scienze Marine, ISMAR, Consiglio Nazionale delle Ricerche, Arsenale-Tesa 104, Castello 2737/F, 30122, Venice, Italy
    • Botter, Margherita. Istituto di Scienze Marine, ISMAR, Consiglio Nazionale delle Ricerche, Arsenale-Tesa 104, Castello 2737/F, 30122, Venice, Italy
    • Zonta, Roberto. Istituto di Scienze Marine, ISMAR, Consiglio Nazionale delle Ricerche, Arsenale-Tesa 104, Castello 2737/F, 30122, Venice, Italy
    • Slaveykova, Vera. Environmental Biogeochemistry and Ecotoxicology, Faculty of Sciences, Institute F.-A. Forel, Earth and Environmental Sciences, University of Geneva, 10, route de Suisse, 1290, Versoix, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Aquatic Geochemistry, 2015, vol. 21, no. 2-4, p. 343-362. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331092
    Summary
    The present study explores the effect of salinity and dissolved organic carbon (DOC) gradients on the stability and reactivity of titanium dioxide nanoparticle (TiO2-NP) agglomerates in ambient water from the Lagoon of Venice and their possible effect on nauplii sampled at the same locations. In all ambient water samples, TiO2-NPs formed rapidly micrometre-sized agglomerates. The increase in the salinity and concomitant decrease in DOC content induced the formation of larger agglomerates, with z-average hydrodynamic diameter increasing with TiO2-NP concentration and exposure duration. Under the studied conditions, ζ-potential exhibited negative values. In line with agglomeration results, enhancement of the salinity and lower DOC resulted in less negative ζ-potential with close to 0 values in the dispersions of 100mgL−1 TiO2-NPs in sea water. Two-hour exposure to micrometre-sized agglomerates of TiO2-NPs resulted in an increase in the fluorescence of propidium iodide (PI) stained nauplii in comparison with unexposed controls, but had no effect at 24-h exposure. The increase in nauplii-associated PI fluorescence was more noticeable in dispersions containing 100mgL−1 than those containing 10mgL−1 TiO2-NPs, suggesting membrane permeability alteration in a concentration-dependent manner. However, the PI staining results have to be interpreted with caution because of the possible dye binding to the nauplii surface without penetration of cellular membrane. The effect of TiO2-NPs on nauplii was more pronounced at higher salinity and decreased with increasing DOC concentrations at 2h, while no trends were found at 24-h exposure, as well as exposure to 100mgL−1 TiO2-NPs.