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J Air Waste Manag Assoc

Title:		Design scenario for the radioisotopic estimation of the biogenic component of airborne particles
Author(s):		Hidy GM; Eatough DJ; Klouda GA;
Address:		"Envair/Aerochem, Placitas, New Mexico 87043, USA. dahidy@comcast.net"
Journal Title:		J Air Waste Manag Assoc
Year:		2004
Volume:		54
Issue:		5
Page Number:		600 - 613
DOI:		10.1080/10473289.2004.10470929
ISSN/ISBN:		1096-2247 (Print) 1096-2247 (Linking)
Abstract:		"An experimental design is described to estimate the fraction of secondary fine particle from the biogenic component of volatile organic compounds (VOCs) in the atmosphere using radiocarbon isotopic abundance ratios. The method distinguishes between 'modern' carbon (C), and 'old' C of primary and secondary origins based on three components, condensed-phase organic carbon (OC), semi-volatile particulate compounds (SVOCs), and VOCs. The method depends on interpretation of diurnal and seasonal variation in OC, SVOC, and VOC concentrations. Sampling employs a filter-denuder unit, which collects the three C components for isotopic analysis. The samples are collected repetitively for a daily sequence of the same hourly intervals covering diurnal periods with similar meteorological conditions. Collected C is thermally treated to separate OC from black carbon on filters and VOCs or SVOCs from adsorbents, with all four fractions individually oxidized to carbon dioxide to determine the radiocarbon content by accelerator mass spectrometry. Using C isotope abundance, the data are interpreted for fractions of primary modern C and secondary modern C as estimated from averaging diurnal and seasonal variations in the concentration data. As support for interpretation, samples of OC, SVOCs, and VOCs would be analyzed for speciation to identify source indicator species present"
Keywords:		Air Pollutants/*analysis Carbon/*analysis Environmental Monitoring Organic Chemicals Particle Size Volatilization;
Notes:		"MedlineHidy, George M Eatough, Delbert J Klouda, George A eng Research Support, U.S. Gov't, Non-P.H.S. 2004/05/20 J Air Waste Manag Assoc. 2004 May; 54(5):600-13. doi: 10.1080/10473289.2004.10470929"