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Manufacturing

NORA Manufacturing Sector Strategic Goals

R019801 - 8875: Development of a Personal Sampler for Nanoparticles (9801)

Start Date: 9/1/2010
End Date: 8/31/2013

Principal Investigator (PI)
Name: Viji Potula
Organization: NIOSH
Sub-Unit: Office of Extramural Projects
Funded By: NIOSH

Primary Goal Addressed

None


Secondary Goal Addressed

None



Attributed to Manufacturing

100%


Project Description

Short Summary

With the increasing development and application of nanomaterials, exposure to airborne nanoparticles in the workplace will undoubtedly increase over time. The airborne nanomaterial in the workplace includes a wide size distribution, mostly with nanoparticles and larger aggregates. This research is significant because it addresses an important need for worker health protection and exposure compliance monitoring. We propose to develop a unique personal sampling device capable of classifying the nanoparticle fraction (=100 nm) from the aerosol stream and collecting this fraction for gravimetric, chemical, and other analyses. This device can be used to accurately assess personal exposure to nanoparticles in terms of mass concentration and physicochemical characteristics. The sampler also has potential applications in the general environment for determining exposures among nonoccupationally exposed individuals.



Description

Production of nanomaterials has increased continuously because of their unique physicochemical characteristics and extensive applications. There are great concerns for the potential health effects of exposure to these nanoparticles. Because of nanomaterialsí small sizes and large surface areas, many studies have shown that the biological effects of nanomaterials are greater than bulk material of the same chemical composition. In 2005, the NIOSH recommended exposure limits of 1.5 mg/m3 for fine TiO2 and 0.1 mg/m3 for ultrafine TiO2, as time-weighted average concentrations (TWA) for up to 10 hr/day during a 40-hr work week. However, there are no suitable personal samplers capable of assessing the exposure level of ultrafine or nanoparticles. The overall objective of this study is to develop a personal sampler capable of collecting the ultrafine particles (nanoparticles) in the occupational environment. This sampler consists of a cyclone for respirable particle classification, a polycarbonate track-etched (PCTE) membrane filter with an acceleration nozzle to achieve nanoparticle classification, and a backup filter to collect nanoparticles. By applying high and localized filtration velocity in the nozzle, diffusion deposition of nanoparticles can be avoided in the classifying PCTE filter, and nanoparticles can be collected in the downstream backup filter. This research will lead to the development of a unique personal sampling device capable of classifying the nanoparticle fraction (= 100 nm) from the aerosol stream and collecting this fraction for gravimetric, chemical, and other analyses. This device can be used to accurately assess personal exposure to nanoparticles in terms of mass concentration and physicochemical characteristics.



Mission Relevance

The overall objective is to develop a personal sampler capable of collecting the ultrafine particle (nanoparticle) fraction of the aerosol in an occupation environment. It can be used to assess personal exposure to nanoparticles in terms of mass concentration and physicochemical characteristics.



 
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