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Methodology for Measuring PM 2.5 Separator Characteristics Using An Aerosizer

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Abstract: A method is presented that enables the measurement of the particle size separation characteristics of an inertial separator in a rapid fashion. Overall penetration is determined for discrete particle sizes using an Aerosizer (Model LD, TSI, Incorporated, Particle Instruments/Amherst, Amherst, MA) time-of-flight measurement device by comparing the number concentration of particles penetrating through a separator to that concentration entering the separator. Critical measurements of separator characteristics are determined using a vibrating orifice aerosol generator to produce the challenge aerosol. Measurements of penetration requiring less precision and accuracy may be determined using nebulized suspensions of polystyrene latex microspheres as the challenge aerosol. The time for measuring a single penetration curve can be reduced from on the order of a week using vibrating orifice aerosol to fewer than two hours using polystyrene latex microsphere aerosol. Validation of the penetration determined with this method was made by comparison to fluorometric techniques. It is estimated that penetration may be measured to an accuracy of plus/minus 4% which is equivalent to an uncertainty of approximately 0.04 um in cutpoint diameter determination for PM2.5 separators. The overall accuracy in determining a cutpoint diameter of a PM2.5 separator (including uncertainty in the creation of test aerosols) is estimated to be better than plus/minus 0.09 um.

This work was conducted by Research Triangle Institute with support provided by the U.S. Environmental Protection Agency through contract no. 68-D5-0040. It has been reviewed in accordance with the Agency's peer and administrative review policies and approved for presentation and publication. Mention of trade names or commercial products does not constitute endorsement or recommendation by RTI or the Agency.
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Citation:Peters, T., R. W. Vanderpool, and R. W. Wiener. Methodology for Measuring PM 2.5 Separator Characteristics Using An Aerosizer. AEROSOL SCIENCE AND TECHNOLOGY 34(5):398-406, (2001).
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Atmospheric Methods & Monitoring Branch
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Product Type: Journal
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Published: 05/01/2001
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Related Entries:
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Bullet Item Heasd PM Research Methods: Particle Methods Evaluation and Development
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Last Updated on Monday, October 22, 2007
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