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| Titel |
A TGA/FT-IR study for measuring OC and EC in aerosol samples |
| VerfasserIn |
P. Fermo, A. Piazzalunga, R. Vecchi, G. Valli, M. Ceriani |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 1 ; Nr. 6, no. 1 (2006-01-31), S.255-266 |
| Datensatznummer |
250003308
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| Publikation (Nr.) |
 copernicus.org/acp-6-255-2006.pdf |
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| Zusammenfassung |
| Carbon analysis consists in the evaluation of the carbonaceous content of
the aerosol (TC) but, more importantly, of its distribution between the two
components EC (Elemental Carbon) and OC (Organic Carbon) that are
characterized by different physical-chemical properties. In spite of the
numerous studies focused on this topic, nowadays a universal methodology for
the determination of the two components EC and OC is not available. In fact
OC and EC (also known as black carbon or soot) are operationally defined by
the method of analysis and, as a consequence, different methods can produce
different results.
In this paper we present results on the application of TGA/FT-IR
(Thermo-gravimetric Analysis/Fourier Transformed Infrared Spectroscopy) to
the characterization of carbonaceous aerosols. The analytical methodology
was applied to PM10 (particulate matter with aerodynamic diameter smaller
than 10 μm) four-hour time resolution samples collected in Milan urban
area. The method is a two-steps thermal one and it is based on the different
thermal behaviour of OC and EC. It has been set up analyzing suitable
standards containing both organic and elemental carbon. Carbon
quantification is achieved by on-line, continuous monitoring of CO2
infrared absorption at 2361 cm−1. A good separation between OC and EC
on particulate matter (PM) samples has been obtained. Ranges and average
values were 12–70 μg/m3 and 20 μg/m3 for OC and 0.2–6 μg/m3
and 2 μg/m3 for EC. On average OC and EC made up
29 (±13)% and 2.5 (±1.8)% of the PM10 fraction,
respectively. The method reliability has been verified by a preliminary
comparison with TOT (Thermal Optical Transmission) technique. OC and EC
values determined for ambient samples of PM10 were correlated with
meteorological parameters as well as with Radon concentrations. |
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