Characteristics of Background Nanoparticle Concentration in a TiO2 Manufacturing Laboratory

Title
Characteristics of Background Nanoparticle Concentration in a TiO2 Manufacturing Laboratory
Authors
박승호정재희이승복배귀남지현석조소혜
Keywords
titania; Nanoparticles; concentration; Exposure; TiO2; Workplace; Background concentration
Issue Date
2011-11
Publisher
Particle and aerosol research; 한국입자에어로졸학회지
Citation
VOL 7, NO 4, 113-121
Abstract
The aerosol nanoparticles are suspected to be exposed to workers in nanomaterial manufacturing facilities. However, the exposure assessment method has not been established. One of important issues is to characterize background level of nanoparticles in workplaces. In this study, intensive aerosol measurements were made at a TiO2 manufacturing laboratory for five consecutive days in May of 2010. The TiO2 nanoparticles were manufactured by the thermal-condensation process in a heated tube furnace. The particle number size distribution was measured using a scanning mobility particle sizer every 5 min, in order to detect particles ranging from 14.5 to 664 nm in diameter. Total particle number concentration shows a severe diurnal variation irrespective of manufacturing process, which was governed by nanoparticles smaller than 50 nm in diameter. During the background monitoring periods, significant peak concentrations were observed between 2 p.m. and 3 p.m. due to the infiltration of secondary aerosol particles formed by photochemical smog. Although significant increase in nanoparticle concentration was also observed during the manufacturing process twice among three times, these particle peak concentrations were lower than those observed during the background measurement. It is suggested that the investigation of background particle contamination is needed prior to conducting main exposure assessment in nanomaterial manufacturing workplaces or laboratories.
URI
http://pubs.kist.re.kr/handle/201004/42789
ISSN
17388716
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KIST Publication > Article
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