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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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Transmission electron micrograph of airborne nanosilica.A. Silica particles observed in the air while pouring nanosilica into thecontainer.B. Silica particles in the air while the vacuum cleaner was on (i.e., withsuctioning of nanosilica).C. Energy dispersive X-ray profile (silicone dioxide nanoparticles on carbon-coatedcopper grid).
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fig_005: Transmission electron micrograph of airborne nanosilica.A. Silica particles observed in the air while pouring nanosilica into thecontainer.B. Silica particles in the air while the vacuum cleaner was on (i.e., withsuctioning of nanosilica).C. Energy dispersive X-ray profile (silicone dioxide nanoparticles on carbon-coatedcopper grid).

Mentions: Measurements collected during pouring of nanosilica into the container exhibit a widevariation in silica particle sizes, ranging from several nm to severalµm. However, particles extracted near the air outlet of the vacuumcleaner were mostly small, ranging from 20 nm to 200 nm (Fig. 5Fig. 5.


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)

Transmission electron micrograph of airborne nanosilica.A. Silica particles observed in the air while pouring nanosilica into thecontainer.B. Silica particles in the air while the vacuum cleaner was on (i.e., withsuctioning of nanosilica).C. Energy dispersive X-ray profile (silicone dioxide nanoparticles on carbon-coatedcopper grid).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig_005: Transmission electron micrograph of airborne nanosilica.A. Silica particles observed in the air while pouring nanosilica into thecontainer.B. Silica particles in the air while the vacuum cleaner was on (i.e., withsuctioning of nanosilica).C. Energy dispersive X-ray profile (silicone dioxide nanoparticles on carbon-coatedcopper grid).
Mentions: Measurements collected during pouring of nanosilica into the container exhibit a widevariation in silica particle sizes, ranging from several nm to severalµm. However, particles extracted near the air outlet of the vacuumcleaner were mostly small, ranging from 20 nm to 200 nm (Fig. 5Fig. 5.

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