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Toxic effects of ZnO nanoparticles towards marine algae Dunaliella tertiolecta

TitleToxic effects of ZnO nanoparticles towards marine algae Dunaliella tertiolecta
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2013
AuthorsManzo, Sonia, Miglietta M.L., Rametta G., Buono S., and Di Francia G.
JournalScience of the Total Environment
Keywordsalga, Algae, article, Chemical analysis, Chlorophyta, concentration (parameters), controlled study, Dissolution, Dose-Response Relationship, Dunaliella, Dunaliella tertiolecta, ecotoxicology, environmental exposure, growth rate, light scattering, marine environment, Marine microalgae, Metal nanoparticles, Metal oxide nanoparticles, molecular evolution, nanoanalysis, nanoparticle, nonhuman, particle size, Particle size analysis, physical chemistry, Physicochemical property, pollution effect, pollution exposure, population growth, priority journal, Size distribution, Toxicity, toxicity test, toxicity testing, toxicokinetics, unclassified drug, Zinc, zinc chloride, Zinc oxide, zinc oxide nanoparticle, ZnO

Dose response curve and population growth rate alterations of marine Chlorophyte Dunaliella tertiolecta derived from the exposure to ZnO nanoparticles were evaluated. Bulk ZnO and ionic zinc were also investigated for comparison. At the same time, the aggregation state and particle size distribution were monitored. The evaluated 50% effect concentration (EC50 1.94 [0.78-2.31]mgZnL-1) indicates that nano ZnO is more toxic than its bulk counterpart (EC50 3.57 [2.77-4.80]mgZnL-1). Cross-referencing the toxicity parameters calculated for ZnCl2 (EC50 0.65 [0.36-0.70]mgZnL-1) and the dissolution properties of the ZnO, it can be gathered that the higher toxicity of nano ZnO is most likely related to the peculiar physicochemical properties of the nanostate with respect to the bulk material. Furthermore growth rate of D. tertiolecta was significantly affected by nano ZnO exposure. Our findings suggest that the primary particle size of the dispersed particles affect the overall toxicity. © 2012 Elsevier B.V.


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Citation KeyManzo2013371