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首页> 外文期刊>Environmental Science & Technology >Relative Contributions of Copper Oxide Nanoparticles and Dissolved Copper to Cu Uptake Kinetics of Gulf Killifish (Fundulus grandis) Embryos
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Relative Contributions of Copper Oxide Nanoparticles and Dissolved Copper to Cu Uptake Kinetics of Gulf Killifish (Fundulus grandis) Embryos

机译：氧化铜纳米粒子和溶解的铜对海湾锦鲤（Fundulus grandis）胚胎铜吸收动力学的相对贡献

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摘要

The toxicity of soluble metal-based nanoma-terials may be due to the uptake of metals in both dissolved and nanoparticulate forms, but the relative contributions of these different forms to overall metal uptake rates under environmental conditions are not quantitatively defned. Here, we investigated the linkage between the dissolution rates of copper(II) oxide (CuO) nanoparticles (NPs) and their bioavailability to Gulf killifish (Fundulus grandis) embryos, with the aim of quantitatively delineating the relative contributions of nanoparticulate and dissolved species for Cu uptake. Gulf killifish embryos were exposed to dissolved Cu and CuO NP mixtures comprising a range of pH values (6.3- 7.5) and three types of natural organic matter (NOM) isolates at various concentrations (0.1-10 mg-C L~(-1)), resulting in a wide range of CuO NP dissolution rates that subsequently influenced Cu uptake. First-order dissolution rate constants of CuO NPs increased with increasing NOM concentration and for NOM isolates with higher aromaticity, as indicated by specific ultraviolet absorbance (SUVA), while Cu uptake rate constants of both dissolved Cu and CuO NP decreased with NOM concentration and aromaticity. As a result, the relative contribution of dissolved Cu and nanoparticulate CuO species for the overall Cu uptake rate was insensitive to NOM type or concentration but largely determined by the percentage of CuO that dissolved. These findings highlight SUVA and aromaticity as key NOM properties affecting the dissolution kinetics and bioavailability of soluble metal based nanomaterials in organic-rich waters. These properties could be used in the incorporation of dissolution kinetics into predictive models for environmental risks of nanomaterials.
机译：可溶性金属基纳米材料的毒性可能是由于吸收了溶解和纳米颗粒形式的金属，但是在环境条件下，这些不同形式对总体金属吸收率的相对贡献尚无定论。在这里，我们调查了氧化铜（II）纳米颗粒（NPs）的溶解速率与其对海湾金鱼（Fundulus grandis）胚胎的生物利用度之间的联系，目的是定量描述纳米颗粒和溶解物种对吸收铜。将海湾致死鱼胚胎暴露于溶解的Cu和CuO NP混合物中，该混合物包含一系列pH值（6.3- 7.5）和三种不同浓度的天然有机物（NOM）分离物（0.1-10 mg-C L〜（-1） ），导致广泛的CuO NP溶解速率，进而影响Cu的吸收。 CuN NPs的一级溶解速率常数随NOM浓度的增加和芳香性较高的NOM分离物的增加而增加，如比紫外线吸收（SUVA）所表明的，而溶解的Cu和CuO NP的Cu吸收速率常数随NOM浓度和芳香性的降低而降低。 。结果，溶解的Cu和纳米颗粒CuO种类对总体Cu吸收速率的相对贡献对NOM类型或浓度不敏感，但主要取决于溶解的CuO的百分比。这些发现强调了SUVA和芳香性是影响可溶性有机金属纳米材料在富含有机物的水中的溶解动力学和生物利用度的关键NOM特性。这些特性可用于将溶解动力学纳入纳米材料环境风险的预测模型中。

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  • 来源
    《Environmental Science & Technology》 |2017年第3期|1387-1404|共18页
  • 作者

    Chuanjia Jiang; Benjamin T. Castellon; Cole W. Matson; George R. Aiken; Heileen Hsu-Kim;

  • 作者单位

    Department of Civil and Environmental Engineering and ,Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708, United States;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708, United States,Department of Environmental Science, Institute of Biomedical Studies, Center for Reservoir and Aquatic Systems Research (CRASR), Baylor University, Waco, Texas 76798, United States;

    Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708, United States,Department of Environmental Science, Institute of Biomedical Studies, Center for Reservoir and Aquatic Systems Research (CRASR), Baylor University, Waco, Texas 76798, United States;

    U.S. Geological Survey, Boulder, Colorado 80303, United States;

    Department of Civil and Environmental Engineering and ,Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, Durham, North Carolina 27708, United States;

  • 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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