Assessment of exposure to airborne carbon nanotubes by laser-induced breakdown spectroscopy analysis of filter samples,Journal of Analytical Atomic Spectrometry

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Assessment of exposure to airborne carbon nanotubes by laser-induced breakdown spectroscopy analysis of filter samples
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2017-08-23 00:00:00 , DOI: 10.1039/c7ja00121e
J.-B. Sirven _{1,

2,

3,

4,

5} , P. Dewalle _{1,

2,

3,

4,

5} , C. Quéré _{1,

2,

3,

4,

5} , V. Fauvet _{5,

6,

7,

8} , M. Tabarant _{1,

2,

3,

4,

5} , S. Motellier _{2,

5,

9,

10,

11} , L. Golanski _{2,

5,

9,

10,

11} , A. Guiot _{2,

5,

9,

10,

11} , M. Amdaoud _{2,

5,

9,

10,

11} , S. Clavaguera _{2,

5,

9,

10,

11} , A. Roynette _{12,

13,

14,

15,

16} , S. Pontreau _{12,

13,

14,

15,

16} , F.-X. Ouf _{12,

13,

14,

15,

16} , F. Gensdarmes _{12,

13,

14,

15,

16}

Affiliation

Exposure assessment is a key step in the evaluation of the risk induced by the handling of engineered nanomaterials. It is a very complex task, because several properties of nanoparticles are assumed to have an effect on their hazards. For exposure monitoring at the workplace, real-time onsite measurements are commonly implemented to measure the particles size and number density, whereas the sampled material is subsequently analysed by electron microscopy. A complementary approach would consist in doing onsite chemical analysis of the filter samples, in order to routinely monitor a potential chronic exposure. Laser-induced breakdown spectroscopy (LIBS) has distinctive advantages for this purpose. Therefore, this work aims at evaluating the performances of LIBS to assess the exposure to airborne carbon nanotubes (CNTs) at the workplace. As carbon is a ubiquitous element in the environment, our strategy was to target metal impurities in CNTs, aluminum and iron in our case. Then, we proceeded in three steps. First, we optimized the choice of the filter type to get the lowest detection limit for both elements. Secondly, this filter was used to quantitatively measure deposited CNTs. Eventually, we conducted an onsite measurement campaign in an industrial CNT production plant to evaluate the exposure in a real situation. We demonstrated that we could reach a detection limit for CNTs compliant with the current NIOSH recommendation of 1 μg m⁻³, and that the detected CNTs during the onsite campaign in areas accessible to workers were at an extremely low concentration, several orders of magnitude lower than this recommendation.

中文翻译：

通过过滤样品的激光诱导击穿光谱分析评估暴露于空气中的碳纳米管的暴露

暴露评估是评估由工程纳米材料处理引起的风险的关键步骤。这是一项非常复杂的任务，因为假定纳米颗粒的几种特性对其危害有影响。对于在工作场所的暴露监测，通常采用实时现场测量来测量颗粒尺寸和数量密度，而随后通过电子显微镜对采样的材料进行分析。一种补充方法是对过滤器样品进行现场化学分析，以便常规监测潜在的慢性暴露。为此目的，激光诱导击穿光谱法（LIBS）具有独特的优势。因此，这项工作旨在评估LIBS的性能，以评估工作场所暴露于空气传播的碳纳米管（CNT）的情况。由于碳是环境中普遍存在的元素，因此我们的策略是针对碳纳米管，铝和铁中的金属杂质。然后，我们分三步进行。首先，我们优化了滤波器类型的选择，以使两个元素的检测限最低。其次，该过滤器用于定量测量沉积的CNT。最终，我们在一家工业CNT生产工厂进行了现场测量活动，以评估实际情况下的暴露量。我们证明，可以达到符合当前NIOSH建议的1μgm的CNT的检测极限我们优化了过滤器类型的选择，以使两个元素的检测限都最低。其次，该过滤器用于定量测量沉积的CNT。最终，我们在一家工业CNT生产工厂进行了现场测量活动，以评估实际情况下的暴露量。我们证明，可以达到符合当前NIOSH建议的1μgm的CNT的检测极限我们优化了过滤器类型的选择，以使两个元素的检测限都最低。其次，该过滤器用于定量测量沉积的CNT。最终，我们在一家工业CNT生产工厂进行了现场测量活动，以评估实际情况下的暴露量。我们证明，可以达到符合当前NIOSH建议的1μgm的CNT的检测极限^-3，并且在现场活动期间在工人可到达的区域中检测到的CNT浓度极低，比该建议值低几个数量级。

更新日期：2017-09-13

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