Bundschuh, Mirco
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
- University of Koblenz-Landau
Abstract
Nanoparticles' fate is amongst other parameters determined by the quantity and quality of natural organic matter (NOM). Consequently, the ecotoxicity of nanoparticles is modified, while only little information is available on the NOM characteristics triggering this interplay. This study systematically examined how NOM quantity and quality influences the acute ecotoxicity of titanium dioxide nanoparticles (nTiO(2)) towards Daphnia magna. Therefore, two nTiO(2) products (A-100 and P25; approximate to 100nm) were investigated in combination with seven NOM types of variable quality at four levels each (up to 4.00mg total organic carbon/L). The results showed that - independent of the applied nTiO(2) product and NOM type - nTiO(2) ecotoxicity decreased up to a factor of>18 with increasing NOM concentration. More importantly, increasing levels of aromaticity and hydrophobicity of the NOM decreased the magnitude of toxic effects caused by nTiO(2), which was again independent of the nTiO(2) product tested. In the light of the ubiquitary presence of NOM, the ecotoxicological risk of nTiO(2) in surface waters with high NOM loads is likely moderate. However, interactions of nTiO(2) and NOM in combination with other natural or chemical stressors are not well-understood but seem to be fundamental for a reliable risk assessment of nanoparticles.
Keywords
Crustacea; dissolved organic matter; SUVA; Suwannee River; toxicity mitigation
Published in
Nanotoxicology
2016, volume: 10, number: 10, pages: 1415-1421
Publisher: TAYLOR & FRANCIS LTD
SLU Authors
Global goals (SDG)
SDG6 Clean water and sanitation
UKÄ Subject classification
Other Natural Sciences
Publication identifier
- DOI: https://doi.org/10.1080/17435390.2016.1222458
Permanent link to this page (URI)
https://res.slu.se/id/publ/80853