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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

Real-time particle measurement in nanosilica handling workplace: particle numberconcentration and geometric mean diameter measured by the SMPS. Evants werenanosilica handling (silica nanoparticle), filter press operation (oil particles),cleaning sonication (water particles), infiltration of outside air (ambientparticles).
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fig_002: Real-time particle measurement in nanosilica handling workplace: particle numberconcentration and geometric mean diameter measured by the SMPS. Evants werenanosilica handling (silica nanoparticle), filter press operation (oil particles),cleaning sonication (water particles), infiltration of outside air (ambientparticles).

Mentions: Particle number concentration increased compared to the background number concentrationduring the handling of nanosilica, operation of the filter press, ultrasonic cleaning ofthe filter, and during the night, when the Thermo-Hygrostat was off. The particle size bySMPS measurement, 62 nm, observed in the background concentration estimation prior tooperation was abruptly reduced to 24 nm when simultaneously handling nanosilica andoperating the vacuum cleaner, and abruptly increased to 76, 93 nm during the operation ofthe filter press and ultrasonic cleaner, respectively (Fig. 2Fig. 2.


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)

Real-time particle measurement in nanosilica handling workplace: particle numberconcentration and geometric mean diameter measured by the SMPS. Evants werenanosilica handling (silica nanoparticle), filter press operation (oil particles),cleaning sonication (water particles), infiltration of outside air (ambientparticles).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig_002: Real-time particle measurement in nanosilica handling workplace: particle numberconcentration and geometric mean diameter measured by the SMPS. Evants werenanosilica handling (silica nanoparticle), filter press operation (oil particles),cleaning sonication (water particles), infiltration of outside air (ambientparticles).
Mentions: Particle number concentration increased compared to the background number concentrationduring the handling of nanosilica, operation of the filter press, ultrasonic cleaning ofthe filter, and during the night, when the Thermo-Hygrostat was off. The particle size bySMPS measurement, 62 nm, observed in the background concentration estimation prior tooperation was abruptly reduced to 24 nm when simultaneously handling nanosilica andoperating the vacuum cleaner, and abruptly increased to 76, 93 nm during the operation ofthe filter press and ultrasonic cleaner, respectively (Fig. 2Fig. 2.

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