Distinguishing nanomaterial particles from background airborne particulate matter for quantitative exposure assessment |
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Authors: | Mariko Ono-Ogasawara Fumio Serita Mitsutoshi Takaya |
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Institution: | (1) Japan National Institute of Occupational Safety and Health, 6-21-1 Nagao, Tama, Kawasaki 214-8585, Japan |
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Abstract: | As the production of engineered nanomaterials quantitatively expands, the chance that workers involved in the manufacturing
process will be exposed to nanoparticles also increases. A risk management system is needed for workplaces in the nanomaterial
industry based on the precautionary principle. One of the problems in the risk management system is difficulty of exposure
assessment. In this article, examples of exposure assessment in nanomaterial industries are reviewed with a focus on distinguishing
engineered nanomaterial particles from background nanoparticles in workplace atmosphere. An approach by JNIOSH (Japan National
Institute of Occupational Safety and Health) to quantitatively measure exposure to carbonaceous nanomaterials is also introduced.
In addition to real-time measurements and qualitative analysis by electron microscopy, quantitative chemical analysis is necessary
for quantitatively assessing exposure to nanomaterials. Chemical analysis is suitable for quantitative exposure measurement
especially at facilities with high levels of background NPs. |
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