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Titolo:
Evaluation of PM2.5 size selectors used in speciation samplers
Autore:
Peters, TM; Gussman, RA; Kenny, LC; Vanderpool, RW;
Indirizzi:
Res Triangle Inst, Res Triangle Pk, NC 27709 USA Res Triangle Inst Res Triangle Pk NC USA 27709 Triangle Pk, NC 27709 USA BGI Inc, Waltham, MA USA BGI Inc Waltham MA USABGI Inc, Waltham, MA USA Hlth & Safety Lab, Sheffield, S Yorkshire, England Hlth & Safety Lab Sheffield S Yorkshire England ld, S Yorkshire, England
Titolo Testata:
AEROSOL SCIENCE AND TECHNOLOGY
fascicolo: 5, volume: 34, anno: 2001,
pagine: 422 - 429
SICI:
0278-6826(200105)34:5<422:EOPSSU>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
AEROSOL-MONITORING APPLICATIONS; CYCLONE; DISTRIBUTIONS; AIR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Peters, TM Univ N Carolina, Rosenau Hall,Campus Box 7400, Chapel Hill, NC 27599 USA Univ N Carolina Rosenau Hall,Campus Box 7400 Chapel Hill NC USA 27599
Citazione:
T.M. Peters et al., "Evaluation of PM2.5 size selectors used in speciation samplers", AEROS SCI T, 34(5), 2001, pp. 422-429

Abstract

The separation characteristics of the PM2,5 aerosol size selectors used inspeciation samplers developed for the U.S. EPA National PM2.5 Chemical Speciation Trends Network were evaluated under clean renditions. Measurement of particle penetration versus aerodynamic diameter was conducted using an APS 3320 in conjunction with a polydisperse test dust, The resulting penetration curves were integrated with assumed ambient particle size distributions (40 CFR Part 53, Subpart F) to obtain an estimate of measured mass concentration and to predict bias relative to the PM2.5 reference separator. The cutpoint of two sharp cut cyclones, from the family of cyclones developed by Kenny and Gussman (1997), compares favorably with the WINS, although possessing a slight tail that extends into the coarse particle mode. A second cyclone used by the Andersen Corp., AN 3,68 demonstrated the sharpest cut characteristics of the devices tested; however, it possesses a D-50 cut size of 2.7 mum at its design flow rate. The separation characteristics of the Spiral separator were observed to be the shallowest and were >2.5 mum when greased or ungreased. Estimated mass concentration bias relative to the FRM was within +/-5% for the idealized fine and typical assumed ambient distributions for all separators. For the idealized coarse distribution, estimatedbias ranged between +4% and +8%. A comparison of these results with actualfield measurements made by the samplers that employ these separators demonstrates that a laboratory evaluation under clean conditions, while useful for design purposes, is not sufficient to predict separator behavior in the "real world".

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Documento generato il 05/07/20 alle ore 23:01:25