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首页> 外文期刊>Environmental Science & Technology >Transfer and Ecotoxicity of Titanium Dioxide Nanoparticles in Terrestrial and Aquatic Ecosystems: A Microcosm Study
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Transfer and Ecotoxicity of Titanium Dioxide Nanoparticles in Terrestrial and Aquatic Ecosystems: A Microcosm Study

机译：二氧化钛纳米颗粒在陆地和水生生态系统中的转移和生态毒性：微观研究

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摘要

With the advancement in nanotechnology, particularly the use of TiO(2 )nanoparticles (NPs), there is a need to study their release into the environment and assess the related risk in an environmentally relevant contamination scenario. In the present study, the transfer and toxicity of TiO2 NPs in microcosms mimicking terrestrial and aquatic ecosystems were evaluated. The contaminated soil was prepared by spiking natural soils, with these then used as the basis for all exposure systems including preparation of soil leachates for amphibian exposure. Results demonstrated significant reductions in bacterial (-45%) and archaeal (-36%) nitrifier abundance; significant translocation of Ti to M. truncatula leaves (+422%); significant reductions in plant height (-17%), number of leaves (-29%), and aboveground biomass (-53%); nonsignificant Ti uptake in snail foot and viscera, and excretion in feces; and genotoxicity to X. laevis larvae (+119% micronuclei). Our study highlights a possible risk of engineered TiO2 NPs in the environment in terms of trophic transfer and toxicity in both terrestrial and aquatic environments.
机译：随着纳米技术的进步，特别是使用TiO（2）纳米颗粒（NPs），需要研究其向环境中的释放并评估与环境有关的污染情况下的相关风险。在本研究中，评估了TiO2 NPs在模拟陆地和水生生态系统的微观世界中的转移和毒性。受污染的土壤是通过掺加天然土壤而制备的，然后将其用作所有暴露系统的基础，包括制备用于两栖动物暴露的土壤渗滤液。结果表明，细菌硝化剂的丰度显着降低了细菌（-45％）和古细菌（-36％）；钛显着移位到截叶芒草（+ 422％）;植株高度（-17％），叶片数量（-29％）和地上生物量（-53％）显着降低；蜗牛足和内脏的钛摄入量不明显，粪便排泄；和对X. laevis幼虫（+ 119％微核）的遗传毒性。我们的研究从陆地和水生环境中的营养转移和毒性方面突出了环境中工程TiO2 NP的可能风险。

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