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Type: Artigo de periódico
Title: Ecotoxicity Of Tio 2 To Daphnia Similis Under Irradiation
Author: Marcone G.P.S.
Oliveira A.C.
Almeida G.
Umbuzeiro G.A.
Jardim W.F.
Abstract: Currently, there are a large number of products (sunscreen, pigments, cosmetics, plastics, toothpastes and photocatalysts) that use TiO 2 nanoparticles. Due to this large production, these nanoparticles can be released into the aquatic, terrestrial and aerial environments at relative high concentration. TiO 2 in natural water has the capacity to harm aquatic organisms such as the Daphnia (Cladocera) species, mainly because the photocatalytic properties of this semiconductor. However, very few toxicity tests of TiO 2 nanoparticles have been conducted under irradiation. The aim of this study was to evaluate anatase and rutile TiO 2 toxicity to Daphnia similis exploring their photocatalytic properties by incorporating UV A and visible radiation as a parameter in the assays. Anatase and rutile TiO 2 samples at the highest concentration tested (100mgL -1) were not toxic to D. similis, neither in the dark nor under visible light conditions. The anatase form and a mixture of anatase and rutile, when illuminated by a UV A black light with a peak emission wavelength of 360nm, presented photo-dependent EC50 values of 56.9-7.8mgL -1, which indicates a toxicity mechanism caused by ROS (reactive oxygen species) generation. © 2012 Elsevier B.V.
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2011.12.075
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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