Journal
ENVIRONMENTAL POLLUTION
Volume 196, Issue -, Pages 431-439Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.11.011
Keywords
Carbon nanotubes; Green algae; Bioavailability; Electron microscopy; FTIR spectroscopy; Nanoparticles
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Funding
- German Federal Ministry of Education and Research (BMBF) [FKZ 03X0043]
- German academic exchange service (DAAD)
- Natural Environment Research Council [ceh010010] Funding Source: researchfish
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Carbon nanotubes (CNTs) are considered promising materials in nanotechnology. We quantified CNT accumulation by the alga Desmodesmus subspicatus. Cells were exposed to radiolabeled CNTs (C-14-CNTs; 1 mg/L) to determine uptake and association, as well as elimination and dissociation in clear media. Attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) was used to detect effects of CNTs on algae. CNT-cell interactions were visualized by electron microscopy and related to alterations in their cell composition. A concentration factor of 5000 L/kg dry weight was calculated. Most of the material agglomerated around the cells, but single tubes were detected in the cytoplasm. Computational analyses of the ATR-FTIR data showed that CNT treated algae differed from controls at all sampling times. CNT exposure changed the biochemical composition of cells. The fact that CNTs are bioavailable for algae and that they influence the cell composition is important with regard to environmental risk assessment of this nanomaterial. (C) 2014 Elsevier Ltd. All rights reserved.
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