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24.
Comparison of Analytical Derivatization Methods for Polar Organic
Aerosol Speciation
Lynn
R. Rinehart(*1), Mark R. McDaniel(1), Roger
L. Tanner(2), and Barbara Zielinska(1)
(1)
Division of Atmospheric Science, Desert Research Institute, Reno,
NV 89512
(2)
Air, Land, and Water Sciences Department, Tennesee Valley Authority,
Muscle Shoals, AL 35662
The speciation of polar organic compounds provides
an important contribution to our understanding of carbonaceous
aerosol sources. Key aspects include secondary aerosol formation
and primary aerosol emissions from sources such as wood combustion
and cooking. To determine the amount and identity of these species,
derivatization by methylation and silylation are commonly employed
to render these species more amenable to gas chromatography/mass
spectrometery analysis. Derivatizations were conducted using BSTFA
with 1% TMS for silylation of the carboxyl and hydroxyl functional
groups and diazomethane for methylation of carboxyl functional
groups. A comparison of derivatization efficiencies was performed
on extracts of filter samples of wood smoke aerosol. Wood smoke
samples were used in this comparison due to the high prevalence
of polar organic species emitted in the combustion of biomass.
In addition, these samples provide a realistic sample matrix for
derivatization. This comparison focuses attention on the derivatization
of the carboxyl group. Results of this experiment provide data
for evaluation of polar organic speciation derivatization methods.
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