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首页> 外文期刊>Environmental Science & Technology >Thermogravimetry-Mass Spectrometry for Carbon Nanotube Detection in Complex Mixtures
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Thermogravimetry-Mass Spectrometry for Carbon Nanotube Detection in Complex Mixtures

机译：复杂混合物中碳纳米管检测的热重质谱法

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摘要

In spite of the growth of the carbon nanotube (CNT) industry, there are no established analytical methods with which to detect or quantify CNTs in environmental matrices. Given that CNTs have relatively high thermal stabilities, we investigated the use of thermal techniques to isolate and quantify single wall carbon nanotubes (SWCNTs). Test materials included ten types of commercial SWCNTs, representative biological macromolecules (bovine serum albumin and methylcellulose), soot, natural coastal sediments, and SWCNT-amended sediments. Different SWCNTs exhibited widely diverse degradation temperatures, and thermal analytical methods may require SWCNT-type specific parameters. To improve quantification capabilities, evolved gases were monitored by mass spectrometry. SWCNTs produced diagnostic ion ratios reflective of their high carbon and iow hydrogen and oxygen contents. Current detection limits are roughly 4 μg_(swCNT) Per sample (e.g., 100 μg_(swciMT) g~(-1) _(sediment) and 40 mg sample), controlled by interfering ions associated with the instrument's non-airtight design. Although future modifications could improve this limitation, the current method is sufficient for quantifying SWCNTs in laboratories and industrial sites where SWCNTs are handled. Furthermore, the method shows promise to distinguish between incidental (e.g., soot) and engineered (e.g., SWCNTs) nanoparticles, which is not possible with current state-of-the-art techniques.
机译：尽管碳纳米管（CNT）行业发展迅速，但尚无用于检测或定量环境基质中CNT的成熟分析方法。鉴于CNT具有相对较高的热稳定性，我们研究了使用热技术来分离和定量单壁碳纳米管（SWCNT）。测试材料包括十种类型的商业SWCNT，代表性的生物大分子（牛血清白蛋白和甲基纤维素），烟灰，天然沿海沉积物和经SWCNT修正的沉积物。不同的SWCNT表现出不同的降解温度，热分析方法可能需要SWCNT类型的特定参数。为了提高定量能力，通过质谱法监测放出的气体。 SWCNT产生的诊断离子比率反映了它们的高碳，低氢和氧含量。每个样品的电流检测极限约为4μg_（swCNT）（例如100μg_（swciMT）g〜（-1）_（沉积物）和40 mg样品），受与仪器非气密性设计相关的干扰离子的控制。尽管将来的修改可以改善此限制，但是当前方法足以量化处理SWCNT的实验室和工业现场的SWCNT。此外，该方法显示出有希望区分偶然的（例如，烟灰）和工程的（例如，SWCNT）纳米颗粒，这在当前的最新技术中是不可能的。

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  • 来源
    《Environmental Science & Technology》 |2012年第22期|12254-12261|共8页
  • 作者

    Desiree L. Plata; Christopher M. Reddy; Philip M. Gschwend;

  • 作者单位

    Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States,Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States,Civil and Environmental Engineering, Duke University, Durham, North Carolina 27708, United States;

    Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States;

    Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, 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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