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34.
Time Series Analysis of SVOC in Ambient PM2.5
J.
Schnelle-Kreis(1)*; R. Zimmermann(1,2,3)
(1)Bavarian
Institute of Applied Environmental Research and Technology, Department
of Chemistry,
Am Mittleren Moos 46, 86167 Augsburg, Germany
(2)GSF – National Research Center for Environment and Health,
Institute of Ecological Chemistry,
Ingolstädter Landstrasse 1, 86573 Neuherberg, Germany
(3)University of Augsburg, Department of Analytical Chemistry,
Universitätsstraße 1,
86159 Augsburg/ Germany
The goal of our study is to characterize the organic
fraction of PM2.5 on a daily basis. The variation of individual
organic species, compound groups or certain indices (e.g. CPI,
U:R) will be used in epidemiological studies on the health effects
of aerosols.
For this study particulate matter is sampled with a PM2.5 sequential
sampler on quartz fiber filters at a flow of 1 m³ h-1. The
sampling period for each sample is 24 h. Sampling started in early
summer 2002 and is expected to continue for at least 3 years.
The samples are analyzed for SVOC by DTD-GC-TOFMS. In the DTD
interface it possible to use the liner of the GC injection interface
as a sample container for the filter aliquots. For Analysis filters
are cut into pieces, each representing 1 m³ of sampled air.
Filter aliquots are placed into GC-liners and isotope labeled
reference compounds are added for quantification.
The liners are put into the cold injector by an autosampler. For
desorption the temperature is raised to 320°C and kept for
10 Minutes. During desorption the SVOC are focused on a retention
gap at 40°C oven temperature.
In most cases a filter aliquot representing 1 m³ of sampled
air is sufficient for a single analysis. Thus repeated analyses
of one sample can be carried out. The variability of repeated
analyses in most cases is < 20%.
In the samples besides others PAH, oxidized PAH, Phenols, Steranes,
Hopanes, Homologous series of n-Alkanes (C17-C40), n-Alkan-2-ones
(C12-C35), n-Alkanoic acids (C12-C20), n-Alkanoic acid methylesters
(C13-C34), n-Alkanoic acid amides (C12-C20), n-Alkylnitriles (C14-C32)
and long chain n-Alkybenzenes (chain length C13-C29) are identified
and (semi)quantified.
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