Environmental Pollution, Jan, 2015, Vol.196, p.276(8)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.envpol.2014.09.022 Byline: Alexander Feckler, Ricki R. Rosenfeldt, Frank Seitz, Ralf Schulz, Mirco Bundschuh Abstract: Interactions with environmental parameters may alter the ecotoxicity of nanoparticles. The present study therefore assessed the (in)direct effects of nanoparticulate titanium dioxide (nano-TiO.sub.2) towards Gammarus fossarum, considering nano-TiO.sub.2's photocatalytic properties at ambient UV-intensities. Gammarids' habitat selection was investigated using its feeding preference on leaf discs either exposed to or protected from UV-irradiation in presence of nano-TiO.sub.2 as proxy (n = 49). UV-irradiation alone induced a significant preference for UV-protected habitats, which was more pronounced in simultaneous presence of nano-TiO.sub.2. This behaviour may be mainly explained by the UV-induced formation of reactive oxygen species (ROS) by nano-TiO.sub.2. Besides their direct toxicity, ROS may have lowered the leaf-quality in UV-exposed areas contributing (approximately 30%) to the observed behavioural pattern. Since the predicted no effect concentration of nano-TiO.sub.2 in combination with UV-irradiation falls below the predicted environmental concentration this study underpins the importance of considering environmental parameters during the risk assessment of nanoparticles. Author Affiliation: (a) Institute for Environmental Sciences, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany (b) Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Lennart Hjelms vag 9, 75007 Uppsala, Sweden Article History: Received 26 June 2014; Revised 16 September 2014; Accepted 22 September 2014
Nanoparticles -- Analysis ; Habitat Conservation -- Analysis ; Titanium Dioxide -- Analysis
Cengage Learning, Inc.