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http://dx.doi.org/10.15269/JKSOEH.2016.26.2.225

Exposure Characteristics of Particles during the After-treatment Processes of Aluminum Oxide Fibers and Nickel Powders  

Kim, Jong Bum (Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology(KIST))
Kim, Kyung Hwan (Dong-il Shimadzu Corporation)
Ryu, Sung Hee (Research Management Team, R&D Center for Greenpatrol Technologies)
Yun, Seong-Taek (Green School(Graduate School of Energy and Environment), Korea University)
Bae, Gwi-Nam (Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology(KIST))
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.26, no.2, 2016 , pp. 225-236 More about this Journal
Abstract
Objectives: Nanomaterials have been used in various fields. As use of nanoproducts is increasing, workers dealing with nanomaterials are also gradually increasing. Exposure assessments for nanomaterials have been carried out for protection of worker's health in workplace. Exposure studies were mainly focused on manufacturing processes, but these studies on after-treatment processes such as refinement, weighing, and packing were insufficient. So, we investigated exposure characteristics of particles during after-treatment processes of $Al_2O_3$ fibers and Ni powders. Methods: Mass-production of Ni powder process was carried out in enclosed capture-type canopy hood. In a developing stage, $Al_2O_3$ was handled with a local ventilation unit. Exposure characteristics of particles were investigated for $Al_2O_3$ fiber and Ni powder processes during the periods of 10:00 to 16:00, 20 May 2014 and 13:00 to 16:00, 21 May 2014, respectively. Three real-time aerosol instruments were utilized in exposure assessment. A scanning mobility particle sizer(SMPS, nanoscan, model 3910, TSI) and an optical particle counter(OPC, portable aerosol spectrometer, model 1.109, Grimm) were used to determine the particle size distribution in the size range of 10-420 nm and $0.25-32{\mu}m$, respectively. In addition, a nanoparticle aerosol monitor(NAM, model 9000, TSI) was used to measure lung-deposited nanoparticle surface area. Membrane filters(isopore membrane filter, pore size of 100 nm) were also used for air sampling for the FE-SEM(model S-5000H, Hitachi) analysis using a personal sampling pump(model GilAir Plus by 2.5 L/min, Gilian). Conclusions: For Ni powder after-treatment process, only 27% increase in particle concentration was found during the process. However, for $Al_2O_3$ fiber after-treatment process, significant exposure(1.56-3.34 times) was observed during the process.
Keywords
after-treatment process; exposure characteristics; particle; ventilation system;
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