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Can visible light impact litter decomposition under pollution of ZnO nanoparticles?

Identifieur interne : 001495 ( Main/Exploration ); précédent : 001494; suivant : 001496

Can visible light impact litter decomposition under pollution of ZnO nanoparticles?

Auteurs : Jingjing Du [République populaire de Chine] ; Yuyan Zhang [République populaire de Chine] ; Lina Liu [République populaire de Chine] ; Mingxiang Qv [République populaire de Chine] ; Yanna Lv [République populaire de Chine] ; Yifei Yin [République populaire de Chine] ; Yinfei Zhou [République populaire de Chine] ; Minghui Cui [République populaire de Chine] ; Yanfeng Zhu [République populaire de Chine] ; Hongzhong Zhang [République populaire de Chine]

Source :

RBID : pubmed:28858717

Descripteurs français

English descriptors

Abstract

ZnO nanoparticles is one of the most used materials in a wide range including antibacterial coating, electronic device, and personal care products. With the development of nanotechnology, ecotoxicology of ZnO nanoparticles has been received increasing attention. To assess the phototoxicity of ZnO nanoparticles in aquatic ecosystem, microcosm experiments were conducted on Populus nigra L. leaf litter decomposition under combined effect of ZnO nanoparticles and visible light radiation. Litter decomposition rate, pH value, extracellular enzyme activity, as well as the relative contributions of fungal community to litter decomposition were studied. Results showed that long-term exposure to ZnO nanoparticles and visible light led to a significant decrease in litter decomposition rate (0.26 m-1 vs 0.45 m-1), and visible light would increase the inhibitory effect (0.24 m-1), which caused significant decrease in pH value of litter cultures, fungal sporulation rate, as well as most extracellular enzyme activities. The phototoxicity of ZnO nanoparticles also showed impacts on fungal community composition, especially on the genus of Varicosporium, whose abundance was significantly and positively related to decomposition rate. In conclusion, our study provides the evidence for negatively effects of ZnO NPs photocatalysis on ecological process of litter decomposition and highlights the contribution of visible light radiation to nanoparticles toxicity in freshwater ecosystems.

DOI: 10.1016/j.chemosphere.2017.08.128
PubMed: 28858717


Affiliations:


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Le document en format XML

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<term>Fresh Water (MeSH)</term>
<term>Fungi (drug effects)</term>
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<div type="abstract" xml:lang="en">ZnO nanoparticles is one of the most used materials in a wide range including antibacterial coating, electronic device, and personal care products. With the development of nanotechnology, ecotoxicology of ZnO nanoparticles has been received increasing attention. To assess the phototoxicity of ZnO nanoparticles in aquatic ecosystem, microcosm experiments were conducted on Populus nigra L. leaf litter decomposition under combined effect of ZnO nanoparticles and visible light radiation. Litter decomposition rate, pH value, extracellular enzyme activity, as well as the relative contributions of fungal community to litter decomposition were studied. Results showed that long-term exposure to ZnO nanoparticles and visible light led to a significant decrease in litter decomposition rate (0.26 m
<sup>-1</sup>
vs 0.45 m
<sup>-1</sup>
), and visible light would increase the inhibitory effect (0.24 m
<sup>-1</sup>
), which caused significant decrease in pH value of litter cultures, fungal sporulation rate, as well as most extracellular enzyme activities. The phototoxicity of ZnO nanoparticles also showed impacts on fungal community composition, especially on the genus of Varicosporium, whose abundance was significantly and positively related to decomposition rate. In conclusion, our study provides the evidence for negatively effects of ZnO NPs photocatalysis on ecological process of litter decomposition and highlights the contribution of visible light radiation to nanoparticles toxicity in freshwater ecosystems.</div>
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<sup>-1</sup>
vs 0.45 m
<sup>-1</sup>
), and visible light would increase the inhibitory effect (0.24 m
<sup>-1</sup>
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<name sortKey="Zhu, Yanfeng" sort="Zhu, Yanfeng" uniqKey="Zhu Y" first="Yanfeng" last="Zhu">Yanfeng Zhu</name>
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