Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Evaluation of the Loading Characteristics of the EPA Wins PM 2.5 Separator

spacer
spacer
Abstract: The loading characteristics of the USEPA WINS (Well Impactor Ninety Six) PM2.5 separator was an important design consideration during the separator's development. In recognition that all inertial separators eventually overload, the loading surface of the WINS was designed to be easily accessible, replaceable, and cleanable. Prior to promulgation of the method, the loading capacity of the WINS separator was evaluated by measuring its performance after repeated loading with laboratory-generated, high concentration, coarse-mode aerosol. For this purpose, a low flow rate loading wind tunnel was designed and constructed to artificially create coarse mode aerosols composed of Arizona Test Dust. This controlled test atmosphere was sampled by the PM2.5 reference method sampling train, as specified in 40 CFR Part 50, Appendix L, at total aerosol mass concentrations averaging 332 ug/m3 for three 24-hour periods. The particle size fractionation characteristics of the WINS was evaluated in the laboratory after each 24-hour sampling event. These performance curves were integrated with three idealized ambient distributions to yield estimates of bias in measured mass concentration with respect to a clean WINS. Test results served as the basis for establishing the required cleaning frequency of the sampler during field use. Following the method's promulgation, characterization of the WINS performance under conditions of actual field use at five U.S. cities showed that a maximum mass concentration bias of -2.1% was estimated for 13 wells after the 5-day sampling period. Overall study results supported the current regulation (USEPA, 1998) that WINS wells be replaced after every 5 days of 24-hour operation.

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.
spacer
Citation:Vanderpool, R. W., T. Peters, S. Natarajan, D. B. Gemmill, and R. W. Wiener. Evaluation of the Loading Characteristics of the EPA Wins PM 2.5 Separator. AEROSOL SCIENCE AND TECHNOLOGY 34(5):444-456, (2001).
spacer
spacer
Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
spacer
Division: Human Exposure & Atmospheric Sciences Division
spacer
Branch: Atmospheric Methods & Monitoring Branch
spacer
Product Type: Journal
spacer
Published: 09/04/2001
spacer
Related Entries:
spacer
Bullet Item Heasd PM Research Methods: Particle Methods Evaluation and Development
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov