Aug 12, 2008

Effects of particle composition and species on toxicity of metallic nanomaterials in aquatic organisms

Environmental Toxicology and Chemistry
Robert J GriffittDavid S Barber

Abstract

Metallic nanoparticles are among the most widely used types of engineered nanomaterials; however, little is known about their environmental fate and effects. To assess potential environmental effects of engineered nanometals, it is important to determine which species are sensitive to adverse effects of various nanomaterials. In the present study, zebrafish, daphnids, and an algal species were used as models of various trophic levels and feeding strategies. To understand whether observed effects are caused by dissolution, particles were characterized before testing, and particle concentration and dissolution were determined during exposures. Organisms were exposed to silver, copper, aluminum, nickel, and cobalt as both nanoparticles and soluble salts as well as to titanium dioxide nanoparticles. Our results indicate that nanosilver and nanocopper cause toxicity in all organisms tested, with 48-h median lethal concentrations as low as 40 and 60 microg/L, respectively, in Daphnia pulex adults, whereas titanium dioxide did not cause toxicity in any of the tests. Susceptibility to nanometal toxicity differed among species, with filter-feeding invertebrates being markedly more susceptible to nanometal exposure compared with larger o...Continue Reading

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Mentioned in this Paper

Aquatic Organisms
Aluminum Measurement
Daphnia pulex
Metals
Adverse Effects
Etiology
Particle Size
Soluble
Nanocrystalline Materials
Chlorophyta

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