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Determination of methoxyphenols in ambient atmospheric particulate matter: tracers for wood combustion.

Authors
Simpson-CD; Paulsen-M; Dills-RL; Liu-LJ; Kalman-DA
Source
Environ Sci Technol 2005 Jan; 39(2):631-637
NIOSHTIC No.
20028996
Abstract
Combustion of wood and other biomass fuels produces source-specific organic compounds arising from pyrolysis of lignin, including substantial amounts of 4-substituted methoxylated phenolic compounds (methoxyphenols). These compounds have been used as atmospheric markers to determine the contribution of wood smoke to ambient atmospheric fine particulate matter (PM). However, reliable quantification of methoxyphenols represents an analytical challenge because these compounds are polar, semi-volatile, and somewhat reactive. We reportherein an improved gas chromatographic-mass spectrometric (GC/MS) method for the sensitive and reliable determination of methoxyphenols in low-volume ambient PM samples. Deuterated standard compounds are added to the environmental samples prior to extraction to determine analyte recoveries in each sample. Analytical figures of merit for the assay, as applied to ambient PM2.5 and PM10 samples are as follows: recovery = 63-100%; precision = 2-6%; analytical limit of detection (S/N 2) = 0.002 microg/mL; limit of quantitation = 0.07-0.45 ng/m3 (assuming a 14 m3 sample). The improved method was applied to ambient PM samples collected between 1999 and 2000 in Seattle, WA. Particle-bound methoxyphenol concentrations in the range <0.1 to 22 ng/m3 were observed and the methoxyphenols were present almost exclusively in the fine (PM2.5) size fraction. We also demonstrated that XRF analysis of samples of atmospheric PM collected on Teflon filters significantly reduced the levels of methoxyphenols measured in the PM samples in subsequent assay of the same filters. Therefore, XRF analysis of filters, commonly undertaken to obtain trace element concentrations for use in source apportionment analyses, would preclude the subsequent analysis of those filters for methoxyphenols and other similarly semivolatile or reactive organic chemicals.
Keywords
Wood; Fuels; Organic-compounds; Phenolic-compounds; Particulates; Gas-chromatography; Mass-spectrometry; Sampling; Air-quality-monitoring; Air-quality; Phenols
Contact
Department of Environmental and Occupational Health Sciences, School of Public Health and Community Medicine, University of Washington, Box 357234, Seattle, Washington 98195-7234
CODEN
ESTHAG
Publication Date
20050115
Document Type
Journal Article
Email Address
simpson1@u.washington.edu
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-007656
Issue of Publication
2
ISSN
0013-936X
Source Name
Environmental Science and Technology
State
WA
Performing Organization
Department of Environmental and Occupational Health Sciences, University of Washington
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