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首页> 外文期刊>Environmental Science & Technology >Dispersion and Toxicity of Selected Manufactured Nanomaterials in Natural River Water Samples: Effects of Water Chemical Composition
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Dispersion and Toxicity of Selected Manufactured Nanomaterials in Natural River Water Samples: Effects of Water Chemical Composition

机译：所选人造纳米材料在天然河水样品中的分散性和毒性：水化学成分的影响

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摘要

Experimental conditions that mimic likely scenarios of manufactured nanomaterials (MNs) introduction to aquatic systems were used to assess the effect of nanoparticle dispersion/ solubility and water chemical composition on MN-toxicity. Aqueous suspensions of fullerenes (C_(60)), nanosilver (nAg), and nanocopper (nCu) were prepared in both deionized water and filtered (0.45 μm) natural river water samples collected from the Suwannee River basin, to emphasize differences in dissolved organic carbon (DOC) concentrations and solution ionic strengths (I). Two toxicity tests, the Ceriodaphnia dubia and MetPLATE bioassays were used. Results obtained from exposure studies show that water chemistry affects the suspension/ solubility of MNs as well as the particle size distribution, resulting in a wide range of biological responses depending on the type of toxicity test used. Under experimental conditions used in this study, C_(60) exhibited no toxicity even when suspended concentrations exceeded 3 mg L~(-1). MetPLATE results showed that the toxicity of aqueous suspensions of nCu tends to increase with increasing DOC concentrations, while increasing I reduces nCu toxicity. The use of the aquatic invertebrate C. dubia on the other hand showed a tendency for decreased mortality with increasing DOC and I. MetPLATE results for nAg showed decreasing trends in toxicity with increasing DOC concentrations and I. However, C. dubia exhibited contrasting biological responses, in that increasing DOC concentrations reduced toxicity, while the latter increased with increasing I. Overall, our results show that laboratory experiments that use Dl-water and drastic MN-suspension methods may not be realistic as MN-dispersion and suspension in natural waters vary significantly with water chemistry and the reactivity of MNs.
机译：实验条件模拟了将人造纳米材料（MNs）引入水生系统的可能情况，用于评估纳米颗粒分散度/溶解度和水化学成分对MN毒性的影响。在去离子水和从Suwannee流域收集的经过过滤的（0.45μm）天然河水样品中均制备了富勒烯（C_（60）），纳米银（nAg）和纳米铜（nCu）的水悬浮液，以强调溶解有机物的差异碳（DOC）浓度和溶液离子强度（I）。使用了两种毒性测试，即杜鹃花色藻和MetPLATE生物测定法。从接触研究获得的结果表明，水化学影响MN的悬浮液/溶解度以及粒径分布，这取决于所使用的毒性试验的类型，会导致广泛的生物学反应。在本研究中使用的实验条件下，即使悬浮浓度超过3 mg L〜（-1），C_（60）也不显示毒性。 MetPLATE结果显示，随着DOC浓度的增加，nCu水悬浮液的毒性趋于增加，而增加I则降低nCu毒性。另一方面，使用水生无脊椎动物杜鹃花会导致死亡率随DOC和I降低而降低的趋势。nAg的MetPLATE结果显示，随着DOC和I浓度的增加，毒性下降的趋势会降低。 ，因为DOC浓度的增加会降低毒性，而DOC则随着I的增加而增加。总体而言，我们的结果表明，使用去离子水和剧烈的MN悬浮液的实验室实验可能不切实际，因为MN在天然水中的分散和悬浮液会有所不同与水化学和MNs的反应性显着相关。

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  • 来源
    《Environmental Science & Technology》 |2009年第9期|3322-3328|共7页
  • 作者

    JIE GAO; SEJIN YOUN; ANNA HOVSEPYAN; VERONICA L. LLANEZA; YU WANG; GABRIEL BITTON; JEAN-CLAUDE J. BONZONGO;

  • 作者单位

    Department of Environmental Engineering Sciences, P.O. Box 116450, University of Florida Gainesville, Florida 32611;

    Department of Environmental Engineering Sciences, P.O. Box 116450, University of Florida Gainesville, Florida 32611;

    Department of Environmental Engineering Sciences, P.O. Box 116450, University of Florida Gainesville, Florida 32611;

    Department of Environmental Engineering Sciences, P.O. Box 116450, University of Florida Gainesville, Florida 32611;

    Department of Environmental Engineering Sciences, P.O. Box 116450, University of Florida Gainesville, Florida 32611;

    Department of Environmental Engineering Sciences, P.O. Box 116450, University of Florida Gainesville, Florida 32611;

    Department of Environmental Engineering Sciences, P.O. Box 116450, University of Florida Gainesville, Florida 32611;

  • 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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