Photocatalytic properties of titanium dioxide nanoparticles affect habitat selection of and food quality for a key species in the leaf litter decomposition process
ENVIRONMENTAL POLLUTION. Bd. 196. 2015 S. 276 - 283
Erscheinungsjahr: 2015
ISBN/ISSN: 0269-7491
Publikationstyp: Zeitschriftenaufsatz
Doi/URN: 10.1016/j.envpol.2014.09.022
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Inhaltszusammenfassung
Interactions with environmental parameters may alter the ecotoxicity of nanoparticles. The present study therefore assessed the (in)direct effects of nanoparticulate titanium dioxide (nano-TiO2) towards Gammarus fossarum, considering nano-TiO2'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-TiO2 as proxy (n = 49). UV-irradiation...Interactions with environmental parameters may alter the ecotoxicity of nanoparticles. The present study therefore assessed the (in)direct effects of nanoparticulate titanium dioxide (nano-TiO2) towards Gammarus fossarum, considering nano-TiO2'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-TiO2 as proxy (n = 49). UV-irradiation alone induced a significant preference for UV-protected habitats, which was more pronounced in simultaneous presence of nano-TiO2. This behaviour may be mainly explained by the UV-induced formation of reactive oxygen species (ROS) by nano-TiO2. 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-TiO2 in combination with UVirradiation falls below the predicted environmental concentration this study underpins the importance of considering environmental parameters during the risk assessment of nanoparticles. (C) 2014 Elsevier Ltd. All rights reserved. » weiterlesen» einklappen
Autoren
Verknüpfte Personen
- Ricki Rosenfeldt
- Mitarbeiter/in
(Natur- und Umweltwissenschaften (RPTU in Landau))
- Frank Seitz
- Mitarbeiter/in
(Natur- und Umweltwissenschaften (RPTU in Landau))