Measurement of the physical properties of aerosols in a fullerene factory for inhalation exposure assessment
Measurement of the physical properties of aerosols in a fullerene factory for inhalation exposure assessment
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DOI：
10.1080/15459620802050053
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发表时间：
2008-01-01
影响因子：
2
通讯作者：
Suemura, Kouji
中科院分区：
文献类型：
--
作者：
Fujitani, Yuji;Kobayashi, Takahiro;Suemura, Kouji
人体暴露评估对于阐明潜在健康风险非常重要。然而，在生产工程纳米材料的工厂的工作环境中，关于颗粒数量浓度和数量尺寸分布（包括纳米颗粒）的信息很少。作者使用扫描迁移率粒度仪和光学粒子计数器在富勒烯工厂测量了直径（Dp）从 10 nm 到 5000 nm 范围内的粒子的粒子数尺寸分布，并使用扫描电子显微镜检查了粒子的形态。对非工作期间、工作期间、搅拌过程期间以及附近室外空气中的颗粒尺寸分布和形态进行比较，以识别颗粒的来源并确定其物理性质。非工作期间工作区域的模态直径为25 nm；这一结果可能是受到室外空气进入的影响。从储罐中取出富勒烯进行装袋和/或称重时，Dp50 nm处的颗粒数浓度不大于非工作期间的颗粒数浓度，但Dp1000 nm处的颗粒数浓度在非工作期间更大。当吸尘器使用时，Dp50 nm处的颗粒数浓度大于非工作期间的颗粒数浓度，但Dp1000 nm处的浓度没有更大。扫描电子显微镜显示，装袋和/或称重过程中发出的粗颗粒是富勒烯的聚集体/附聚物；尽管 Dp50 nm 粒子的起源尚不清楚。
Assessment of human exposure is important for the elucidation of potential health risks. However, there is little information available on particle number concentrations and number size distributions, including those of nanoparticles, in the working environments of factories producing engineered nanomaterials. The authors used a scanning mobility particle sizer and an optical particle counter to measure the particle number size distributions of particles ranging in diameter (Dp) from 10 nm to 5000 nm in a fullerene factory and used scanning electron microscopy to examine the morphology of the particles. Comparisons of particle size distributions and morphology during non-work periods, during work periods, during an agitation process, and in the nearby outdoor air were conducted to identify the sources of the particles and to determine their physical properties. A modal diameter of 25 nm was found in the working area during the non-work period; this result was probably influenced by ingress of outdoor air. During the removal of fullerenes from a storage tank for bagging and/or weighing, the particle number concentration at Dp50 nm was no greater than that in the non-work period, but the concentration at Dp1000 nm was greater during the non-work period. When a vacuum cleaner was in use, the particle number concentration at Dp50 nm was greater than that during the non-work period, but the concentration at Dp1000 nm was no greater. Scanning electron microscopy revealed that the coarse particles emitted during bagging and/or weighing were aggregates/agglomerates of fullerenes; although origin of particles with Dp50 nm is unclear.