期刊
ENVIRONMENTAL POLLUTION
卷 156, 期 2, 页码 233-239出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.08.004
关键词
Synthetic TiO2; Aquatic environment; Electron microscopy; Exterior paints
资金
- EMEZ (Electron Microscopy Center ETHZ)
- Electron Microscopy Center of EMPA
- Eawag (action field project NAFAS)
- Empa (NAREP research program)
We present direct evidence of the release of synthetic nanoparticles from urban applications into the aquatic environment. We investigated TiO2 particles as these particles are used in large quantities in exterior paints as whitening pigments and are to some extent also present in the nano-size range. TiO2 particles were traced from exterior facade paints to the discharge into Surface waters. We Used a centrifugation based sample preparation which recovers TiO2 particles between roughly 20 and 300 nm. Analytical electron microscopy revealed that TiO2 particles are detached from new and aged facade paints by natural weather conditions and are then transported by facade runoff and are discharged into natural, receiving waters. Microscopic investigations are confirmed by bulk chemical analysis. By combining results from microscopic investigations with bulk chemical analysis we calculated the number densities of synthetic TiO2 particles in the runoff. (C) 2008 Elsevier Ltd. All rights reserved.
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