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| Titel |
Comparison of analytical methods for Humic Like Substances (HULIS) measurements in atmospheric particles |
| VerfasserIn |
C. Baduel, D. Voisin, J. L. Jaffrezo |
| 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 ; 9, no. 16 ; Nr. 9, no. 16 (2009-08-19), S.5949-5962 |
| Datensatznummer |
250007579
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| Publikation (Nr.) |
 copernicus.org/acp-9-5949-2009.pdf |
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| Zusammenfassung |
| Humic-Like Substances (HULIS) are a major contributor to the organic carbon
in atmospheric aerosol. It would be necessary to standardize an analytical
method that could be easily and routinely used for HULIS measurements. We
present one of the first comparisons of two of the main methods in use to
extract HULIS, using I) a weak anion exchanger (DEAE) and II) the
combination of two separation steps, one according to polarity (on C18)
and the second according to acidity (with a strong anion exchanger SAX). The
quantification is performed with a TOC analyzer, complemented by an
investigation of the chemical structure of the extracted fractions by
UV-Visible spectroscopy. The analytical performances of each method are
determined and compared for humic substances standards. These methods are
further applied to determine the water extractable HULIS (HULISWS) and
the 0.1 M NaOH alkaline extractable HULIS (HULIS T) in atmospheric
aerosol collected in an Alpine Valley during winter time. This comparison,
although on a limited batch of samples shows that the simpler DEAE isolation
procedure leads to higher recoveries and better reproducibility than the
C18-SAX procedure, and might therefore be preferable. |
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