Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 10, Pages 2515-2522Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.06.020
Keywords
Rutile; Nanoparticles; Alteration; Titanium dioxide; Risk assessment
Categories
Funding
- French National Program NANOALTER (INSU/EC2CO/CYTRIX)
- French Agency for the Environment and Energy Management (ADEME, Paris, France)
- Region Lorraine
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Mineral sunscreen nanocomposites, based on a nano-TiO2 core, coated with aluminium hydroxide and dimethicone films, were submitted to an artificial ageing process. The resulting Altered TiO2 Nanocomposites (ATN) were then tested in the liquid phase on the plant model Vicia faba, which was exposed 48 h to three nominal concentrations: 5, 25 and 50 mg ATN/L Plant growth, photosystem II maximum quantum yield, genotoxicity (micronucleus test) and phytochelatins levels showed no change compared to controls. Oxidative stress biomarkers remained unchanged in shoots while in roots, glutathione reductase activity decreased at 50 mg ATN/L and ascorbate peroxidase activity decreased for 5 and 25 mg ATN/L. Nevertheless, despite the weak response of biological endpoints, ICP-MS measurements revealed high Ti and Al concentrations in roots, and X-ray fluorescence micro-spectroscopy revealed titanium internalization in superficial root tissues. Eventual long-term effects on plants may occur. (C) 2011 Elsevier Ltd. All rights reserved.
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