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首页> 外文期刊>Environmental Science & Technology >Insight into the Crucial Role of Secondary Mineral Phases in the Transfer of Gold Nanoparticles through a Sand Column Using Online ICP-MS/splCP-MS Monitoring
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Insight into the Crucial Role of Secondary Mineral Phases in the Transfer of Gold Nanoparticles through a Sand Column Using Online ICP-MS/splCP-MS Monitoring

机译：使用在线ICP-MS / splCP-MS监测洞察次生矿物相在金纳米颗粒通过砂柱转移中的关键作用

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摘要

Investigating the transport of engineered nano particles through representative soils is an important issue in assessing their mobility and fate in the environment. In this study, successive injections of gold nanoparticles (AuNPs) were performed in a quartz sand column with an eluent composed of 10(-2) M NaCl at a pH of 7.5. After this series of injections, remobilization of the AuNPs was examined by raising the eluent pH to 10. Au-197 and the conservative ionic tracer Br-79 were monitored simultaneously by online inductively coupled plasma mass spectrometry (ICP-MS), and the particulate nature of gold eluting from the column was confirmed by setting the ICP-MS in the "single particle" mode. The extent of AuNP attachment was greater than predicted by DLVO theory considering quartz as the sole collector, decreased with the number of injections and with particle size. In contrast with the repulsive interaction energy between the particles and the quartz surface, kaolinite, a secondary mineral of the sand, provided favorable conditions for particle attachment. The superimposed signals of 197Au and Al-27 in the column effluent after pH increase suggest that gold nanoparticles were essentially remobilized as heteroaggregates with the kaolinite colloids they were attached to when favorable conditions for clay detachment from the sand grains were encountered.
机译：研究工程纳米颗粒通过代表性土壤的运输是评估其在环境中的流动性和命运的重要问题。在这项研究中，金纳米颗粒（AuNPs）的连续进样在石英砂柱中进行，洗脱液由pH值为7.5的10（-2）M NaCl组成。在这一系列的注射之后，通过将洗脱液的pH值提高到10来检查AuNP的迁移。同时通过在线电感耦合等离子体质谱法（ICP-MS）监控Au-197和保守离子示踪剂Br-79通过将ICP-MS设置为“单颗粒”模式，可以确认从色谱柱洗脱的金的性质。考虑到石英是唯一的收集器，AuNP的附着程度大于DLVO理论所预测的程度，随着进样次数和粒径的减小而降低。与颗粒和石英表面之间的排斥相互作用能相反，高岭石（一种沙子的次生矿物）为颗粒的附着提供了有利条件。 pH升高后，柱废水中197Au和Al-27的叠加信号表明，当遇到有利的粘土从砂粒脱离的条件时，金纳米颗粒基本上与杂色团聚体固定在一起，并与它们附着的高岭石胶体结合。

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  • 来源
    《Environmental Science & Technology》 |2019年第18期|10714-10722|共9页
  • 作者

    Motellier Sylvie; Locatelli Dominique; Bera Remi;

  • 作者单位

    Univ Grenoble Alpes Commissariat Energie Atom & Energies Alternat Lab Nanocharacterizat & Nanosafety DRT LITEN DTNM SEN 17 Ave Martyrs F-38054 Grenoble France;

    Univ Grenoble Alpes Commissariat Energie Atom & Energies Alternat Lab Nanocharacterizat & Nanosafety DRT LITEN DTNM SEN 17 Ave Martyrs F-38054 Grenoble France|SOCOR Rue Barack Obama F-59187 Dechy 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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  • 正文语种 eng
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