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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
22/12/2014 |
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Data da última atualização: |
23/12/2014 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
CLEMENTE, Z.; CASTRO, V. L. S. S. de; JONSSON, C. M.; FRACETO, L. F. |
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Afiliação: |
ZAIRA CLEMENTE, IB-UNICAMP; VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; CLAUDIO MARTIN JONSSON, CNPMA; LEONARDO FERNANDES FRACETO, UNESP. |
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Título: |
Minimal levels of ultraviolet light enhance the toxicity of TiO2 nanoparticles to two representative organisms of aquatic systems. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Journal of Nanoparticle Research, Dordrecht, v. 16, n. 8, article 2259, 2014. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: A number of studies have been published concerning the potential ecotoxicological risks of titanium dioxide nanoparticles (nano-TiO2), but the results still remain inconclusive. The characteristics of the diverse types of nano-TiO2 must be considered in order to establish experimental models to study their toxicity. TiO2 has important photocatalytic properties, and its photoactivation occurs in the ultraviolet (UV) range. The aim of this study was to investigate the toxicity of nano-TiO2 to indicators organisms of freshwater and saline aquatic systems, under different illumination conditions (visible light, with or without UV light). Daphnia similis and Artemia salina were co-exposed to a sublethal dose of UV light and different concentrations of nano-TiO2 in the form of anatase (TA) or an anatase/rutile mixture (TM). Both products were considered practically non-toxic under visible light to D. similis and A. salina (EC50(48h) > 100 mg/L). Exposure to nano-TiO2 under visible and UV light enhanced the toxicity of both products. In the case of D. similis, TM was more toxic than TA, showing values of EC50(48h) = 60.16 and 750.55 mg/L, respectively. A. salina was more sensitive than D. similis, with EC50(48h) = 4 mg/L for both products. Measurements were made of the growth rates of exposed organisms, together with biomarkers of oxidative stress and metabolism. The results showed that the effects of nano-TiO2 depended on the organism, exposure time, crystal phase, and illumination conditions, and emphasized the need for a full characterization of nanoparticles and their behavior when studying nanotoxicity. MenosAbstract: A number of studies have been published concerning the potential ecotoxicological risks of titanium dioxide nanoparticles (nano-TiO2), but the results still remain inconclusive. The characteristics of the diverse types of nano-TiO2 must be considered in order to establish experimental models to study their toxicity. TiO2 has important photocatalytic properties, and its photoactivation occurs in the ultraviolet (UV) range. The aim of this study was to investigate the toxicity of nano-TiO2 to indicators organisms of freshwater and saline aquatic systems, under different illumination conditions (visible light, with or without UV light). Daphnia similis and Artemia salina were co-exposed to a sublethal dose of UV light and different concentrations of nano-TiO2 in the form of anatase (TA) or an anatase/rutile mixture (TM). Both products were considered practically non-toxic under visible light to D. similis and A. salina (EC50(48h) > 100 mg/L). Exposure to nano-TiO2 under visible and UV light enhanced the toxicity of both products. In the case of D. similis, TM was more toxic than TA, showing values of EC50(48h) = 60.16 and 750.55 mg/L, respectively. A. salina was more sensitive than D. similis, with EC50(48h) = 4 mg/L for both products. Measurements were made of the growth rates of exposed organisms, together with biomarkers of oxidative stress and metabolism. The results showed that the effects of nano-TiO2 depended on the organism, exposure time, crystal phase, and i... Mostrar Tudo |
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Palavras-Chave: |
Dióxido de titânio; Microcrustacean; Nano-TiO2; Nanotoxicity; Ultraviolet light. |
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Thesagro: |
Crustáceo; Metal; Raio ultravioleta; Toxidez. |
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Thesaurus NAL: |
Biomarkers; Daphnia similis; Ecotoxicology; Nanoparticles; Nanotechnology; Titanium dioxide; Toxicity; Ultraviolet radiation. |
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Categoria do assunto: |
H Saúde e Patologia |
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Marc: |
LEADER 02705naa a2200361 a 4500
001 2003514
005 2014-12-23
008 2014 bl uuuu u00u1 u #d
100 1 $aCLEMENTE, Z.
245 $aMinimal levels of ultraviolet light enhance the toxicity of TiO2 nanoparticles to two representative organisms of aquatic systems.$h[electronic resource]
260 $c2014
520 $aAbstract: A number of studies have been published concerning the potential ecotoxicological risks of titanium dioxide nanoparticles (nano-TiO2), but the results still remain inconclusive. The characteristics of the diverse types of nano-TiO2 must be considered in order to establish experimental models to study their toxicity. TiO2 has important photocatalytic properties, and its photoactivation occurs in the ultraviolet (UV) range. The aim of this study was to investigate the toxicity of nano-TiO2 to indicators organisms of freshwater and saline aquatic systems, under different illumination conditions (visible light, with or without UV light). Daphnia similis and Artemia salina were co-exposed to a sublethal dose of UV light and different concentrations of nano-TiO2 in the form of anatase (TA) or an anatase/rutile mixture (TM). Both products were considered practically non-toxic under visible light to D. similis and A. salina (EC50(48h) > 100 mg/L). Exposure to nano-TiO2 under visible and UV light enhanced the toxicity of both products. In the case of D. similis, TM was more toxic than TA, showing values of EC50(48h) = 60.16 and 750.55 mg/L, respectively. A. salina was more sensitive than D. similis, with EC50(48h) = 4 mg/L for both products. Measurements were made of the growth rates of exposed organisms, together with biomarkers of oxidative stress and metabolism. The results showed that the effects of nano-TiO2 depended on the organism, exposure time, crystal phase, and illumination conditions, and emphasized the need for a full characterization of nanoparticles and their behavior when studying nanotoxicity.
650 $aBiomarkers
650 $aDaphnia similis
650 $aEcotoxicology
650 $aNanoparticles
650 $aNanotechnology
650 $aTitanium dioxide
650 $aToxicity
650 $aUltraviolet radiation
650 $aCrustáceo
650 $aMetal
650 $aRaio ultravioleta
650 $aToxidez
653 $aDióxido de titânio
653 $aMicrocrustacean
653 $aNano-TiO2
653 $aNanotoxicity
653 $aUltraviolet light
700 1 $aCASTRO, V. L. S. S. de
700 1 $aJONSSON, C. M.
700 1 $aFRACETO, L. F.
773 $tJournal of Nanoparticle Research, Dordrecht$gv. 16, n. 8, article 2259, 2014.
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