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首页> 外文期刊>Environmental Science & Technology >Diuron Sorbed to Carbon Nanotubes Exhibits Enhanced Toxicity to Chlorella vulgaris
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Diuron Sorbed to Carbon Nanotubes Exhibits Enhanced Toxicity to Chlorella vulgaris

机译：碳纳米管吸附的Diuron表现出对小球藻的增强毒性

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摘要

Carbon nanotubes (CNT) are more and more likely to be present in the environment, where they will associate with organic micropollutants due to strong sorption. The toxic effects of these CNT-micropollutant mixtures on aquatic organisms are poorly characterized. Here, we systematically quantified the effects of the herbicide diuron on the photosynthetic activity of the green alga Chlorella vulgaris in presence of different multiwalled CNT (industrial, purified, pristine, and oxidized) or soot. The presence of carbonaceous nanopartides reduced the adverse effect of diuron maximally by <78% (industrial CNT) and <34% (soot) at 10.0 mg CNT/L, 5.0 mg soot/L, and diuron concentrations in the range 0.73-2990 μg/L. However, taking into account the measured dissolved instead of the nominal diuron concentration, the toxic effect of diuron was equal to or stronger in the presence of CNT by a factor of up to 5. Sorbedrndiuron consequently remained partially bioavailable. The most pronounced increase in toxicity occurred after a 24 h exposure of algae and CNT. All results point to locally elevated exposure concentration (LEEC) in the proximity of algal cells associated with CNT as the cause for the increase in diuron toxicity.
机译：碳纳米管（CNT）越来越多地存在于环境中，由于强大的吸附作用，它们将与有机微污染物缔合。这些CNT-微污染物混合物对水生生物的毒性作用表征不佳。在这里，我们系统地定量了在不同的多壁CNT（工业的，纯化的，原始的和氧化的）或烟灰的存在下，除草剂杜隆对绿藻小球藻光合作用的影响。碳纳米粒子的存在在10.0 mg CNT / L，5.0 mg烟灰/ L和0.73-2990μg范围内的diuron浓度下，最大程度地降低了diuron的不利影响<78％（工业CNT）和<34％（烟灰）。 /升但是，考虑到测得的溶解度而不是标称的杜伦浓度，在存在CNT的情况下，杜伦的毒性作用等于或强于5。因此，磺草双嘧隆保持部分生物利用度。暴露于藻类和CNT 24小时后，毒性最明显地增加。所有结果都表明与CNT相关的藻类细胞附近的局部暴露浓度（LEEC）升高，是导致Diuron毒性增加的原因。

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  • 来源
    《Environmental Science & Technology》 |2013年第13期|7012-7019|共8页
  • 作者

    Fabienne Schwab; Thomas D. Bucheli; Louise Camenzuli; Arnaud Magrez; Katja Knauer; Laura Sigg; Bernd Nowack;

  • 作者单位

    EMPA-Swiss Federal Laboratories for Materials Science and Technology, CH-9014 St. Gallen, Switzerland Agroscope Reckenholz-Taenikon, Research Station ART, CH-8046 Zurich, Switzerland;

    Agroscope Reckenholz-Taenikon, Research Station ART, CH-8046 Zurich, Switzerland;

    Agroscope Reckenholz-Taenikon, Research Station ART, CH-8046 Zurich, Switzerland;

    EPFL-Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland;

    Federal Office for Agriculture FOAG, CH-3003 Bern, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600 Duebendorf, Switzerland;

    EMPA-Swiss Federal Laboratories for Materials Science and Technology, CH-9014 St. Gallen, Switzerland;

  • 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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