Abstract
In this study we investigated the release of titanium dioxide (TiO2), silver (Ag) and silica (SiO2) engineered nanoparticles (ENPs) from three different paints by using standardized water immersion test for coatings. Fibre-cement panels were coated with paints containing ENPs and then exposed to UV light and abraded to simulate weathering. After the static water immersion test, we observed a very low release of Ti (4–8 μg/l), while the Ag measured in leachates was under detection limit (0.1 μg/l). A small release of Si was measured in leachates, with 73 mg/l of Si released from paints containing SiO2 ENPs after 120 h of water immersion. The cumulative loss of Si was about 1.8 % with respect to initial amount of Si in paint. Microscopic results highlighted that SiO2 ENPs are mainly released in form of agglomerates with other particles, and only very few single SiO2 ENPs were found in leachates. The results confirmed that Si migration is related to immersion cycles (wetting and drying cycles) of tested paints.
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The research leading to these results has received funding from the European Union Seventh Framework Program (FP7/2007-2013) under Grant Agreement No. 247810, NanoHouse Project.
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Zuin, S., Gaiani, M., Ferrari, A. et al. Leaching of nanoparticles from experimental water-borne paints under laboratory test conditions. J Nanopart Res 16, 2185 (2014). https://doi.org/10.1007/s11051-013-2185-1
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DOI: https://doi.org/10.1007/s11051-013-2185-1