Exposure assessment of carbon nanotube manufacturing workplaces

Title
Exposure assessment of carbon nanotube manufacturing workplaces
Authors
이지현이승복배귀남전기수윤진욱지준호성재혁이병규이종한양중선김현영강창수유일재
Keywords
Carbon nanotubes; Exposure assessment; Workplace; Nanoparticle; Nanomaterial
Issue Date
2010-05
Publisher
Inhalation toxicology
Citation
VOL 22, NO 5, 369-381
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/37589
ISSN
0895-8378
Appears in Collections:
KIST Publication > Article
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