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|title: ||Assessing the ecotoxicity of metal nano-oxides with potential for wastewater treatment|
|authors: ||Nogueira, V.|
Rocha-Santos, T. A. P.
Rasteiro, M. G.
Soares, A. M. V. M.
Duarte, A. C.
Sublethal and lethal effects
|issue date: ||2015|
|abstract: ||The rapid development of nanotechnology and the
increasing use of nanomaterials (NMs) raise concern about
their fate and potential effects in the environment, especially
for those that could be used for remediation purposes and that
will be intentionally released to the environment. Despite the
remarkable emerging literature addressing the biological effects
of NMs to aquatic organisms, the existing information is
still scarce and contradictory. Therefore, aimed at selecting
NMs for the treatment of organic and inorganic effluents, we
assessed the potential toxicity of NiO (100 and 10–20 nm),
Fe2O3 (≈85×425 nm), and TiO2 (<25 nm), to a battery of
aquatic organisms: Vibrio fischeri, Raphidocelis subcapitata,
Lemna minor, Daphnia magna, Brachionus plicatilis, and
Artemia salina. Also a mutagenic test was performed with
two Salmonella typhimurium strains. Suspensions of each
NM, prepared with the different test media, were characterized
by dynamic light scattering (DLS) and eletrophoretic light scattering
(ELS). For the assays with marine species, no toxicity was
observed for all the compounds. In opposite, statistically significant
effects were produced on all freshwater species, being
D. magna the most sensitive organism. Based on the results of
this study, the tested NMs can be classified in a decreasing order
of toxicity NiO (100 nm) > NiO (10–20 nm) > TiO2 (<25 nm) >
Fe2O3, allowing to infer that apparently Fe2O3 NMs seems to be
the one with less risks for receiving aquatic systems.|
|publisher version/DOI: ||http://dx.doi.org/10.1007/s11356-015-4581-9|
|source: ||Environmental science and pollution research|
|appears in collections||CESAM - Artigos|
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