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Detection of Carbon Nanotubes in Indoor Workplaces Using Elemental Impurities

机译：使用元素杂质检测室内工作场所中的碳纳米管

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摘要

This study investigated three area sampling approaches for using metal impurities in carbon nanotubes (CNTs) to identify CNT releases in workplace environments: air concentrations (μg/m~3), surface loadings (μg/cm~2), and passive deposition rates (μg/m~2/h). Correlations between metal impurities and CNTs were evaluated by collecting simultaneous colocated area samples for thermal-optical analysis (for CNTs) and ICP-MS analysis (for metals) in a CNT manufacturing facility. CNTs correlated strongly with Co (residual catalyst) and Ni (impurity) in floor surface loadings, and with Co in passive deposition samples. Interpretation of elemental ratios (Co/Fe) assisted in distinguishing among CNT and non-CNT sources of contamination. Stable isotopes of Pb impurities were useful for identifying aerosolized CNTs in the workplace environment of a downstream user, as CNTs from different manufacturers each had distinctive Pb isotope signatures. Pb isotopes were not useful for identifying CNT releases within a CNT manufacturing environment, however, because the CNT signature reflected the indoor background signature. CNT manufacturing companies and downstream users of CNTs will benefit from the availability of alternative and complementary strategies for identifying the presence/absence of CNTs in the workplace and for monitoring the effectiveness of control measures.
机译：这项研究调查了三种使用碳纳米管（CNT）中的金属杂质确定工作场所环境中CNT释放的区域采样方法：空气浓度（μg/ m〜3），表面负荷（μg/ cm〜2）和被动沉积速率（ μg/ m〜2 / h）。通过收集同时置放的区域样本以在CNT制造工厂中进行热光分析（对于CNT）和ICP-MS分析（对于金属），来评估金属杂质与CNT之间的相关性。碳纳米管与地板表面负载中的Co（残留催化剂）和Ni（杂质）以及被动沉积样品中的Co密切相关。元素比（Co / Fe）的解释有助于区分CNT和非CNT污染源。 Pb杂质的稳定同位素可用于识别下游用户工作场所环境中的雾化CNT，因为来自不同制造商的CNT各自具有独特的Pb同位素特征。但是，Pb同位素对于识别CNT制造环境中的CNT释放没有用，因为CNT的特征反映了室内背景特征。 CNT制造公司和CNT的下游用户将从可替代和补充策略的可用性中受益，这些策略可用于识别工作场所中CNT的存在/不存在以及监控控制措施的有效性。

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  • 来源
    《Environmental Science & Technology》 |2015年第21期|12888-12896|共9页
  • 作者

    Pat E. Rasmussen; Mary-Luyza Avramescu; Innocent Jayawardene; H. David Gardner;

  • 作者单位

    Environmental Health Science and Research Bureau, HECSB, Health Canada, 50 Colombine Driveway, Tunney's Pasture 0803C, Ottawa, Ontario, Canada, K1A 0K9,University of Ottawa, Earth and Environmental Sciences Department, Ottawa, Ontario, Canada K1N 6N5;

    Environmental Health Science and Research Bureau, HECSB, Health Canada, 50 Colombine Driveway, Tunney's Pasture 0803C, Ottawa, Ontario, Canada, K1A 0K9;

    Environmental Health Science and Research Bureau, HECSB, Health Canada, 50 Colombine Driveway, Tunney's Pasture 0803C, Ottawa, Ontario, Canada, K1A 0K9;

    Environmental Health Science and Research Bureau, HECSB, Health Canada, 50 Colombine Driveway, Tunney's Pasture 0803C, Ottawa, Ontario, Canada, K1A 0K9,University of Ottawa, Earth and Environmental Sciences Department, Ottawa, Ontario, Canada K1N 6N5;

  • 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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