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首页> 外文期刊>Environmental Science & Technology >Isotopically Labeled Nanoparticles at Relevant Concentrations: How Low Can We Go? The Case of CdSe/ZnS QDs in Surface Waters
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Isotopically Labeled Nanoparticles at Relevant Concentrations: How Low Can We Go? The Case of CdSe/ZnS QDs in Surface Waters

机译：同位素标记的相关浓度的纳米颗粒：我们能走多低？地表水中CdSe / ZnS量子点的情况

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摘要

Analytical barriers impose work at nanoparticles (NPs) concentrations orders of magnitude higher than the expected NPs concentrations in the environment. To overcome these limitations, the use of nontraditional stable isotope tracers incorporated in NPs (spiked-NPs) coupled with HRICP-MS has been proposed. The performance and efficiency of this analytical method was assessed in the case of quantum dots (QDs). Multi-isotopically labeled In CeSe/68ZnS QDs were synthesized and their dissemination in natural aquatic matrices (river, estuarine and sea waters) was modeled at very low concentrations (from 0.1 to 5000 ppt). The QD limits of quantification (QD-LOQ) in each matrix were calculated according to the isotopic tracer. In ultrapure and simple medium (HNO3 2%), Zn, Cd, and Se originated from the QDs were quantifiable at concentrations of 10, 0.3, and 6 ppt, respectively, which are lower than the conventional HR-ICP-MS LOQs. In aquatic matrices, the QD-LOQs increase 10-, 130-, and 250-fold for Zn, Cd, and Se, respectively, but remain relevant of environmental concentrations (3.4 ppt QD-LOQs 2.5 ppb). These results validate the use of isotopically labeled ENPs at relevant concentrations in experimental studies related to either their fate, behavior, or toxicity in most aquatic matrices.
机译：分析性障碍使纳米颗粒（NPs）的浓度比环境中预期的NPs浓度高几个数量级。为了克服这些局限性，已经提出了将非传统的稳定同位素示踪剂与HRICP-MS结合在NP（掺入NP）中使用的建议。在量子点（QD）的情况下评估了此分析方法的性能和效率。合成了多同位素标记的CeSe / 68ZnS量子点，并以非常低的浓度（0.1至5000 ppt）模拟了它们在天然水生基质（河流，河口和海水）中的传播。根据同位素示踪剂计算每个基质中的QD定量限（QD-LOQ）。在超纯和简单培养基（HNO3为2％）中，源自QD的Zn，Cd和Se的浓度分别为10、0.3和6 ppt，可低于常规HR-ICP-MS LOQ。在水基质中，Zn，Cd和Se的QD-LOQ分别增加10倍，130倍和250倍，但仍与环境浓度相关（3.4 ppt

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  • 来源
    《Environmental Science & Technology》 |2019年第5期|2586-2594|共9页
  • 作者

    Supiandi Nurul I.; Charron G.; Tharaud M.; Cordier L.; Guigner J. -M.; Benedetti M. F.; Sivry Y.;

  • 作者单位

    Univ Paris Diderot, CNRS, UMR 7154, Inst Phys Globe Paris,Sorbonne Paris Cite, F-75005 Paris, France;

    Univ Paris Diderot, Sorbonne Paris Cite, Lab Matiere & Syst Complexes MSC, UMR 7057, F-75013 Paris, France;

    Univ Paris Diderot, CNRS, UMR 7154, Inst Phys Globe Paris,Sorbonne Paris Cite, F-75005 Paris, France;

    Univ Paris Diderot, CNRS, UMR 7154, Inst Phys Globe Paris,Sorbonne Paris Cite, F-75005 Paris, France;

    IMPMC, F-75005 Paris, France;

    Univ Paris Diderot, CNRS, UMR 7154, Inst Phys Globe Paris,Sorbonne Paris Cite, F-75005 Paris, France;

    Univ Paris Diderot, CNRS, UMR 7154, Inst Phys Globe Paris,Sorbonne Paris Cite, F-75005 Paris, 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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