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首页> 外文期刊>Environmental Science & Technology >Combined Study of Titanium Dioxide Nanoparticle Transport and Toxicity on Microbial Nitrifying Communities under Single and Repeated Exposures in Soil Columns
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Combined Study of Titanium Dioxide Nanoparticle Transport and Toxicity on Microbial Nitrifying Communities under Single and Repeated Exposures in Soil Columns

机译：土壤柱中一次或多次暴露下二氧化钛纳米粒子迁移和毒性对微生物硝化群落的联合研究。

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摘要

Soils are exposed to nanopartides (NPs) as a result of their increasing use in many commercial products. Adverse effects of NPs on soil microorganisms have been reported in several ecotoxicological studies using microcosms. Although repeated exposures are more likely to occur in soils, most of these previous studies were performed as a single exposure to NPs. Contrary to single contamination, the study of multiple NP contaminations in soils requires the use of specialized setups. Using a soil column experiment, we compared the influence of single and repeated exposures (one, two, or three exposures that resulted in the same final concentration applied) on the transport of titanium dioxide (TiO_2) NPs through soil and the effect of these different exposure scenarios on the abundance and activity of soil nitrifying microbial communities after a 2 month incubation. The transport of TiO_2 NPs was very limited under both single and repeated exposures and was highest for the lowest concentration injected during the first application. Significant decreases in nitrification activity and ammonia-oxidizing archaea and bacteria populations were observed only for the repeated exposure scenario (three TiO_2 NP contaminations). These results suggest that, under repeated exposures, the transport of TiO_2 NPs to deep soil layers and groundwater is limited and that a chronic contamination is more harmful for the soil microbiological functioning than a single exposure.
机译：由于土壤在许多商业产品中的使用越来越多，因此土壤暴露于纳米颗粒（NPs）中。在一些使用缩影的生态毒理学研究中，已经报道了NP对土壤微生物的不利影响。尽管在土壤中更容易发生重复暴露，但是这些先前的研究大多数都是对NP的单次暴露。与单一污染相反，对土壤中多种NP污染的研究需要使用专门的设置。使用土壤柱实验，我们比较了单次和重复暴露（一次，两次或三次暴露导致施加相同的最终浓度）对二氧化钛（TiO_2）NP通过土壤的运输的影响以及这些不同影响孵化2个月后暴露情况下土壤硝化微生物群落的丰度和活性。 TiO_2 NPs的运输在单次和重复暴露下都非常有限，并且在首次施用期间以最低的注入量最高。仅在反复暴露的情况下（三种TiO_2 NP污染），硝化活性显着降低，并且氨氧化古细菌和细菌数量明显减少。这些结果表明，在反复暴露下，TiO_2 NPs向深层土壤和地下水的运输受到限制，与单次暴露相比，长期污染对土壤微生物功能的危害更大。

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  • 来源
    《Environmental Science & Technology》 |2016年第19期|10693-10699|共7页
  • 作者

    Marie Simonin; Jean M. F. Martins; Gaeelle Uzu; Erwann Vince; Agnes Richaume;

  • 作者单位

    Universite de Lyon, F-69002 Lyon, France,Universite Claude Bernard Lyon 1, F-69100 Villeurbanne, France,Microbial Ecology Lab, UMR 5557, Centre National de la Recherche Scientifique (CNRS), Universite Lyon 1, F-69622 Villeurbanne, France,Laboratoire d'etude des Transferts en Hydrologie et Environnement (LTHE), UMR 5564, Universite Grenoble Alpes, F-38000 Grenoble, France,Department of Biology and Center for the Environmental Implications of Nanotechnology, Duke University, Durham, North Carolina 27708, United States;

    Laboratoire d'etude des Transferts en Hydrologie et Environnement (LTHE), UMR 5564, Universite Grenoble Alpes, F-38000 Grenoble, France,Laboratoire d'etude des Transferts en Hydrologie et Environnement (LTHE), Centre National de la Recherche Scientifique (CNRS), F-38000 Grenoble, France;

    Laboratoire d'etude des Transferts en Hydrologie et Environnement (LTHE), UMR 5564, Universite Grenoble Alpes, F-38000 Grenoble, France,Laboratoire d'etude des Transferts en Hydrologie et Environnement (LTHE), Institut de Recherche pour le Developpement (IRD), F-38000 Grenoble, France;

    Laboratoire d'etude des Transferts en Hydrologie et Environnement (LTHE), UMR 5564, Universite Grenoble Alpes, F-38000 Grenoble, France,Laboratoire d'etude des Transferts en Hydrologie et Environnement (LTHE), Centre National de la Recherche Scientifique (CNRS), F-38000 Grenoble, France;

    Universite de Lyon, F-69002 Lyon, France,Universite Claude Bernard Lyon 1, F-69100 Villeurbanne, France,Microbial Ecology Lab, UMR 5557, Centre National de la Recherche Scientifique (CNRS), Universite Lyon 1, F-69622 Villeurbanne, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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