Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 44, Issue 6, Pages 1962-1967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es902987d
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Funding
- National Science Foundation
- U.S. Environmental Protection Agency [NSF-EF0830117]
- UC Toxic Substances Research and Training Program, Lead Campus on Nanotoxicology
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0830117] Funding Source: National Science Foundation
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There is a pressing need for information on the mobility of nanoparticles in the complex aqueous matrices found in realistic environmental conditions. We dispersed three different metal oxide nanoparticles (TiO2, ZnO and CeO2) in samples taken from eight different aqueous media associated with seawater, lagoon, river, and groundwater, and measured their electrophoretic mobility, state of aggregation, and rate of sedimentation. The electrophoretic mobility of the particles in a given aqueous media was dominated by the presence of natural organic matter (NOM) and ionic strength, and independent of pH. NOM adsorbed onto these nanoparticles significantly reduces their aggregation, stabilizing them under many conditions. The transition from reaction to diffusion limited aggregation occurs at an electrophoretic mobility from around -2 to -0.8 mu m s(-1) V-1 cm. These results are key for designing and interpreting nanoparticle ecotoxicity studies in various environmental conditions.
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