Characteristics of Background Nanoparticle Concentration in a TiO2 Manufacturing Laboratory
- Characteristics of Background Nanoparticle Concentration in a TiO2 Manufacturing Laboratory
- 박승호; 정재희; 이승복; 배귀남; 지현석; 조소혜
- titania; Nanoparticles; concentration; Exposure; TiO2; Workplace; Background concentration
- Issue Date
- Particle and aerosol research; 한국입자에어로졸학회지
- VOL 7, NO 4, 113-121
- 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.
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