Oct 12, 2010

Physicochemical characterization and ecotoxicological assessment of CeO2 nanoparticles using two aquatic microorganisms

Toxicological Sciences : an Official Journal of the Society of Toxicology
Ismael Rodea-PalomaresRoberto Rosal

Abstract

The physicochemical properties of nanoparticles determine their interaction with living organisms. Four different cerium oxide nanoparticles, including commercial materials, were characterized and compared with a micron-sized ceria. The formation of aggregates as well as ζ-potential, surface area, and chemical composition were determined. The formation of primary particle aggregates was a slow process that led to different particle sizes depending on the composition of the medium. In this paper, we describe the toxicity of cerium oxide for the self-luminescent cyanobacterial recombinant strain Anabaena CPB4337 and the green alga Pseudokirchneriella subcapitata. The toxicity for Anabaena exposed to nanoparticles in pure water for 24 h ranged from 0.27 to 6.3 mg/l; P. subcapitata EC(50) (yielded effective concentration of nanoparticles that inhibits the cellular function of interest by 50%) values in the 2.4-29.6 mg/l range. Images of both organisms showed membrane disruption and highly damaged cells. Free cerium was highly toxic for both organisms, but the negligible amount found dissolved in the nanoparticle suspensions could not explain the observed toxic effect of nanoceria on the aquatic organisms; the dissolution of zinc co...Continue Reading

Mentioned in this Paper

Microorganism
Aquatic Organisms
Cell Injury
Cerium
Uptake
Surface Properties
Cyanobacterium (antigen)
Ceric oxide (CeO)
Particle Size
Landfill Leachate

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