Characterization of materials released into water from paint containing nano-SiO2
| Autor: | Samuel Brunner, Luana Golanski, Roger Vonbank, Stefano Zuin, Andrea Ulrich, Adrian Wichser, Ahmed Al-Kattan, Bernd Nowack, Yadira Arroyo |
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| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Ultraviolet Rays Precipitation (chemistry) Chemistry Health Toxicology and Mutagenesis Engineered nanomaterials Public Health Environmental and Occupational Health Water Nano sio2 Weathering General Medicine General Chemistry Particulates Silicon Dioxide Pollution Nanostructures Characterization (materials science) Matrix (chemical analysis) Environmental chemistry Paint Forensic engineering Environmental Chemistry Leachate Water Pollutants Chemical |
| Zdroj: | Chemosphere. 119:1314-1321 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2014.02.005 |
| Popis: | In order to assess the possible risks of applications containing engineered nanomaterials, it is essential to generate more data about their release and exposure, so far largely overlooked areas of research. The aim of this work was to study the characterization of the materials released from paint containing nano-SiO2 during weathering and exposure to water. Panels coated with nano-SiO2 containing paint and a nano-free reference paint were exposed to accelerated weathering cycles in a climate chamber. The total release of 89 six-hour cycles of UV-illumination and precipitation was 2.3% of the total SiO2 contained in the paint. Additional tests with powdered and aged paint showed that the majority of the released Si was present in dissolved form and that only a small percentage was present in particulate and nano-particulate form. TEM imaging of the leachates indicated that the majority of the particulate Si was contained in composites together with Ca, representing the paint matrix, and only few single dispersed SiO2-NPs were detected. The results suggest that toxicological and ecotoxicological studies need to consider that the released particles may have been transformed or are embedded in a matrix. |
| Databáze: | OpenAIRE |
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