Exposure assessment of carbon nanotube manufacturing workplaces
- Exposure assessment of carbon nanotube manufacturing workplaces
- 이지현; 이승복; 배귀남; 전기수; 윤진욱; 지준호; 성재혁; 이병규; 이종한; 양중선; 김현영; 강창수; 유일재
- Carbon nanotubes; Exposure assessment; Workplace; Nanoparticle; Nanomaterial
- Issue Date
- Inhalation toxicology
- VOL 22, NO 5, 369-381
- Seven CNT (carbon nanotube) handling workplaces were investigated for exposure assessment. Personal sampling,
area sampling, and real-time monitoring using an SMPS (scanning mobility particle sizer), dust monitor, and
aethalometer were performed to characterize the mass exposure, particle size distribution, and particle number
exposure. No workplace was found to exceed the current ACGIH (American Conference of Governmental Industrial
Hygienists) TLVs (threshold limit values) and OELs (occupational exposure levels) set by the Korean Ministry of
Labor for carbon black (3.5 mg/㎥), PNOS (particles not otherwise specified; 3 mg/㎥), and asbestos (0.1 fiber/cc).
Nanoparticles and fine particles were most frequently released after opening the CVD (chemical vapor deposition)
cover, followed by catalyst preparation. Other work processes that prompted nanoparticle release included spraying,
CNT preparation, ultrasonic dispersion, wafer heating, and opening the water bath cover. All these operation
processes could be effectively controlled with the implementation of exposure mitigation, such as engineering
control, except at one workplace where only natural ventilation was used.
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