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J Air Waste Manag Assoc

Title:		Determination of PM(2.5) Sulfate and Nitrate with a PC-BOSS Designed for Routine Sampling for Semi-Volatile Particulate Matter
Author(s):		Eatough DJ; Pang Y; Eatough NL;
Address:		"a Department of Chemistry and Biochemistry , Brigham Young University , Provo , Utah , USA. b Department of Chemistry , California Polytechnic University , San Luis Obispo , California , USA"
Journal Title:		J Air Waste Manag Assoc
Year:		1999
Volume:		49
Issue:		9
Page Number:		69 - 75
DOI:		10.1080/10473289.1999.10463883
ISSN/ISBN:		2162-2906 (Electronic) 1096-2247 (Linking)
Abstract:		"Ambient particles contain substantial quantities of material that can be lost from the particles during sample collection on a filter. These include ammonium nitrate and semi-volatile organic compounds. As a result, the concentrations of these species are often significantly in error for results obtained with a filter pack sampler. The accurate measurement of these semi-volatile fine particulate species is essential for a complete understanding of the possible causes of health effects associated with exposure to fine particles. Past organic compound diffusion denuder samplers developed by the authors (e.g., the Brigham Young University Organic Sampling System [BOSS]) are not amenable to routine field use because of the need to independently determine the gas-phase semi-volatile organic material efficiency of the denuder for each sample. This problem has been eliminated using a combined virtual impactor, particle-concentrator inlet to provide a concentrated stream of 0.1-2.5-mum particles. This is followed by a BOSS diffusion denuder and filter packs to collect particles, including any semi-volatile species lost from the particles during sampling. The samp ler (Particle Concentrator-Brigham Young University Organic Sampling System [PC-BOSS]) contains a post-denuder multifilter pack unit to allow for the routine collection of several sequential samples. The PC-BOSS can be used for the determination of both fine particulate nitrate and semi-volatile organic material without significant 'positive' or 'negative' sampling artifacts. Validation of the sampler for the determination of PM(2.5) sulfate and nitrate based on comparison of results obtained at Riverside, CA with collocated PC-BOSS, annular denuder, and Chem Spec samplers indicates the PC-BOSS gives accurate results for these species with a precision of +/-5-8%. An average of 33% of the PM(2.5) nitrate was lost from the particles during sampling for both denuder and single filter samplers"
Keywords:
Notes:		"PubMed-not-MEDLINEEatough, Delbert J Pang, Yanbo Eatough, Norman L eng 1999/09/01 J Air Waste Manag Assoc. 1999 Sep; 49(9):69-75. doi: 10.1080/10473289.1999.10463883"