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Assessment of nanoparticle exposure in nanosilica handling process: including characteristics of nanoparticles leaking from a vacuum cleaner.

Kim B, Kim H, Yu IJ - Ind Health (2013)

Bottom Line: The use of a vacuum cleaner with a leak (caused by an inadequate sealing) was found to be the origin of nanosilica dispersion in the indoor air.While the particle size of the nanosilica that emitted into the air (during the handling of nanosilica by a worker) was mostly over 100 nm or several microns (µm) due to the coagulation of particles, the size of nanosilica that leaked out of vacuum cleaner was almost similar to the primary size (mode diameter 11.5 nm).Analysis of area samples resulted in 20% (60% in terms of peak concentration) less than the analysis of the personals sample.

View Article: PubMed Central - PubMed

Affiliation: Occupational Lung Disease Institute, Korea Workers' Compensation and Welfare Service, Republic of Korea.

ABSTRACT
Nanosilica is one of the most widely used nanomaterials across the world. However, their assessment data on the occupational exposure to nanoparticles is insufficient. The present study performed an exposure monitoring in workplace environments where synthetic powders are prepared using fumed nanosilica. Furthermore, after it was observed during exposure monitoring that nanoparticles were emitted through leakage in a vacuum cleaner (even with a HEPA-filter installed in it), the properties of the leaked nanoparticles were also investigated. Workers were exposed to high-concentration nanosilica emitted into the air while pouring it into a container or transferring the container. The use of a vacuum cleaner with a leak (caused by an inadequate sealing) was found to be the origin of nanosilica dispersion in the indoor air. While the particle size of the nanosilica that emitted into the air (during the handling of nanosilica by a worker) was mostly over 100 nm or several microns (µm) due to the coagulation of particles, the size of nanosilica that leaked out of vacuum cleaner was almost similar to the primary size (mode diameter 11.5 nm). Analysis of area samples resulted in 20% (60% in terms of peak concentration) less than the analysis of the personals sample.

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Related in: MedlinePlus

Comparison of particle number concnentration in personal sample and area samplemeasured by two sets of DISCmini in nanosilica handling workplace.
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fig_004: Comparison of particle number concnentration in personal sample and area samplemeasured by two sets of DISCmini in nanosilica handling workplace.

Mentions: The particle number concentration of the personal samples (except during the night) hadan arithmetic mean (AM) of 7,054 particles/cc, a geometric mean (GM) of 3,131particles/cc. The average particle diameter had an AM of 45 nm and a GM of 42 nm; whiletheir surface area has an AM of 12 µm2/cc, and a GM of 7µm2/cc. The particle number concentration observed in thepersonal samples was higher than that of the area sample by 1.6 times (GM 1.2 times), andthe peak was also 1.6 times higher (Fig 4Fig. 4.


Assessment of nanoparticle exposure in nanosilica handling process: including characteristics of nanoparticles leaking from a vacuum cleaner.

Kim B, Kim H, Yu IJ - Ind Health (2013)

Comparison of particle number concnentration in personal sample and area samplemeasured by two sets of DISCmini in nanosilica handling workplace.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4202753&req=5

fig_004: Comparison of particle number concnentration in personal sample and area samplemeasured by two sets of DISCmini in nanosilica handling workplace.
Mentions: The particle number concentration of the personal samples (except during the night) hadan arithmetic mean (AM) of 7,054 particles/cc, a geometric mean (GM) of 3,131particles/cc. The average particle diameter had an AM of 45 nm and a GM of 42 nm; whiletheir surface area has an AM of 12 µm2/cc, and a GM of 7µm2/cc. The particle number concentration observed in thepersonal samples was higher than that of the area sample by 1.6 times (GM 1.2 times), andthe peak was also 1.6 times higher (Fig 4Fig. 4.

Bottom Line: The use of a vacuum cleaner with a leak (caused by an inadequate sealing) was found to be the origin of nanosilica dispersion in the indoor air.While the particle size of the nanosilica that emitted into the air (during the handling of nanosilica by a worker) was mostly over 100 nm or several microns (µm) due to the coagulation of particles, the size of nanosilica that leaked out of vacuum cleaner was almost similar to the primary size (mode diameter 11.5 nm).Analysis of area samples resulted in 20% (60% in terms of peak concentration) less than the analysis of the personals sample.

View Article: PubMed Central - PubMed

Affiliation: Occupational Lung Disease Institute, Korea Workers' Compensation and Welfare Service, Republic of Korea.

ABSTRACT
Nanosilica is one of the most widely used nanomaterials across the world. However, their assessment data on the occupational exposure to nanoparticles is insufficient. The present study performed an exposure monitoring in workplace environments where synthetic powders are prepared using fumed nanosilica. Furthermore, after it was observed during exposure monitoring that nanoparticles were emitted through leakage in a vacuum cleaner (even with a HEPA-filter installed in it), the properties of the leaked nanoparticles were also investigated. Workers were exposed to high-concentration nanosilica emitted into the air while pouring it into a container or transferring the container. The use of a vacuum cleaner with a leak (caused by an inadequate sealing) was found to be the origin of nanosilica dispersion in the indoor air. While the particle size of the nanosilica that emitted into the air (during the handling of nanosilica by a worker) was mostly over 100 nm or several microns (µm) due to the coagulation of particles, the size of nanosilica that leaked out of vacuum cleaner was almost similar to the primary size (mode diameter 11.5 nm). Analysis of area samples resulted in 20% (60% in terms of peak concentration) less than the analysis of the personals sample.

Show MeSH
Related in: MedlinePlus