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Titolo:
Integrated and real-time diffusion denuder sampler for PM2.5
Autore:
Eatough, DJ; Obeidi, F; Pang, YB; Ding, YM; Eatough, NL; Wilson, WE;
Indirizzi:
Brigham Young Univ, Dept Chem & Biochem, Provo, UT 84602 USA Brigham YoungUniv Provo UT USA 84602 Chem & Biochem, Provo, UT 84602 USA Calif3407ytech State Univ San Luis Obispo, Dept Chem, San Luis Obispo, CA 9 Calif Polytech State Univ San Luis Obispo San Luis Obispo CA USA 93407 9 US EPA, Natl Ctr Environm Assessment, Res Triangle Pk, NC 27711 USA US EPA Res Triangle Pk NC USA 27711 ssment, Res Triangle Pk, NC 27711 USA
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 17, volume: 33, anno: 1999,
pagine: 2835 - 2844
SICI:
1352-2310(199908)33:17<2835:IARDDS>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICULATE ORGANIC MATERIAL; CHEMICAL-COMPOSITION; SIZE DISTRIBUTION; ANNULAR DENUDER; PARTICLES; AEROSOL; SYSTEM; COLLECTION; ARTIFACT;
Keywords:
fine particulate mass; fine particulate organic material; carbonaceous material; nitrate; sulfate; sampling artifacts; denuder sampler; filter pack sampler; real-time sampler;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Eatough, DJ Brigham Young Univ, Dept Chem & Biochem, Provo, UT 84602 USA Brigham Young Univ Provo UT USA 84602 em, Provo, UT 84602 USA
Citazione:
D.J. Eatough et al., "Integrated and real-time diffusion denuder sampler for PM2.5", ATMOS ENVIR, 33(17), 1999, pp. 2835-2844

Abstract

Particulate matter (PM) is a complex mixture of stable condensed phases, adsorbed or dissolved gases, and semi-volatile materials, i.e. compounds that transfer between the gas and condensed phases. Fine particles in both rural and urban environments contain substantial quantities of semi-volatile material that can be lost from the particles during sample collection on a filter and during subsequent handling, storage and conditioning (or equilibration). These include ammonium nitrate, semi-volatile organic compounds andparticle bound water. In addition, gas phase organic compounds can also beabsorbed by a quartz filter. As a result, the concentrations of these species are often significantly in error for results obtained with a conventional single filter sampler. The accurate measurement of the mass and chemicalcomponents of fine particles will become more important as a result of therecent promulgation of fine particle standards by the US Environmental Protection Agency and the additional monitoring that will be required for implementation of those standards as well as for additional research on the sources and effects of PM. Past organic compound diffusion denuder samplers developed by us (BOSS, BYU Organic Sampling System) are not amenable to routine field use because of the need to independently determine the gas phase semi-volatile organic material breakthrough of the denuder for each sample. This problem has been eliminated in the Particle Concentrator-Brigham YoungUniversity Organic Sampling System (PC-BOSS) using a combined virtual impactor, particle-concentrator inlet to provide a concentrated stream of 0.1-2.5 mu m particles. This is followed by a BOSS diffusion denuder and filter packs containing particle collecting and sorbent fillers to collect particles, including any semi-volatile organic material or ammonium nitrate lost from the particles during sampling. The PC-BOSS contains a sequential sampler to allow for the routine collection of several samples. A second sampler,the Real-rime Total Ambient Mass Sampler (RAMS), has been developed by combining the PC-BOSS with TEOM technology. In this sampler, a diffusion dryerto remove gas phase water follows the diffusion denuder, The dried aerosolstream is then sampled with a "sandwich" (TX40 and sorbent) filter on the TEOM tapered element to collect particles, including any semi-volatile species. Laboratory and field validation data indicate that the precision of determination of fine particulate material, including ammonium nitrate and semi-volatile organic material is better than +/- 10%. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 16:10:44