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Titolo:
PRECISION AND ACCURACY IN THE DETERMINATION OF SULFUR-OXIDES, FLUORIDE, AND SPHERICAL ALUMINOSILICATE FLY-ASH PARTICLES IN PROJECT MOHAVE
Autore:
EATOUGH NL; EATOUGH M; JOSEPH JM; CAKA FM; LEWIS L; EATOUGH DJ;
Indirizzi:
BRIGHAM YOUNG UNIV,DEPT CHEM & BIOCHEM PROVO UT 84602 BRIGHAM YOUNG UNIV,DEPT CHEM & BIOCHEM PROVO UT 84602 CALIF POLYTECH STATE UNIV SAN LUIS OBISPO,DEPT CHEM SAN LUIS OBISPO CA 93407
Titolo Testata:
Journal of the Air & Waste Management Association [1995]
fascicolo: 4, volume: 47, anno: 1997,
pagine: 455 - 467
Fonte:
ISI
Lingua:
ENG
Soggetto:
DENUDER; SULFATE; SO2(G); DESERT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
N.L. Eatough et al., "PRECISION AND ACCURACY IN THE DETERMINATION OF SULFUR-OXIDES, FLUORIDE, AND SPHERICAL ALUMINOSILICATE FLY-ASH PARTICLES IN PROJECT MOHAVE", Journal of the Air & Waste Management Association [1995], 47(4), 1997, pp. 455-467

Abstract

The precision and accuracy of the determination of particulate sulfate and fluoride, and gas phase SO, and HF are estimated from the results obtained from collocated replicate samples and from collocated comparison samples for high- and low-volume filter pack and annular diffusion denuder samplers. The results of replicate analysis of collocated samples and replicate analyses of a given sample for the determination of spherical aluminosilicate fly ash particles have also been compared. Each of these species is being used in the chemical mass balance source apportionment of sulfur oxides in the Grand Canyon region as part of Project MOHAVE, and the precision and accuracy analyses given in this paper provide input to that analysis. The precision of the various measurements reported here is +/-1.8 nmol/m(3) and +/-2.5 nmol/m(3) for the determination of SO2 and sulfate, respectively, with an annular denuder. The precision is +/-0.5 nmol/m(3) and +/-2.0 nmol/m(3) for the determination of the same species with a high-volume or low-volume filter pack. The precision for the determination of the sum of HF(g) and fine particulate fluoride is +/-0.3 nmol/m(3). The precision for thedetermination of aluminosilicate fly ash particles is +/-100 particles/m(3). At high concentrations of the various species, reproducibilityof the various measurements is +/-10% to +/-14% of the measured concentration. The concentrations of sulfate determined using filter pack samplers are frequently higher than those determined using diffusion denuder sampling systems. The magnitude of the difference (e.g., 2-10 nmol sulfate/m(3)) is small, but important relative to the precision of the data and the concentrations of particulate sulfate present (typically 5-20 nmol sulfate/m(3)). The concentrations of SO2(g) determined using a high-volume cascade impactor filter pack sampler are correspondingly lower than those obtained with diffusion denuder samplers. The concentrations of SOx (SO2(g) plus particulate sulfate) determined using the two samplers during Project MOHAVE at the Spirit Mountain, NV, and Hopi Point, AZ, sampling sites were in agreement. However, for samples collected at Painted Desert, AZ, and Meadview, AZ, the concentrations of SOx and SO2(g) determined with a high-volume cascade impactor filter pack sampler were frequently lower than those determined using adiffusion denuder sampling system. These two sites had very low ambient relative humidity, an average of 25%. Possible causes of observed differences in the SO2(g) and sulfate results obtained from different types of samplers are given.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 16:06:10