 |
| Titel |
An intercomparison study of analytical methods used for quantification of levoglucosan in ambient aerosol filter samples |
| VerfasserIn |
K. E. Yttri, J. Schnelle-Kreis, W. Maenhaut, G. Abbaszade, C. Alves, A. Bjerke, N. Bonnier, R. Bossi, M. Claeys, C. Dye, M. Evtyugina, D. García-Gacio, R. Hillamo, A. Hoffer, M. Hyder, Y. Iinuma, J.-L. Jaffrezo, A. Kasper-Giebl, G. Kiss, P. L. López-Mahia, C. Pio, C. Piot, C. Ramirez-Santa-Cruz, J. Sciare, K. Teinilä, R. Vermeylen, A. Vicente, R. Zimmermann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 1 ; Nr. 8, no. 1 (2015-01-09), S.125-147 |
| Datensatznummer |
250116043
|
| Publikation (Nr.) |
 copernicus.org/amt-8-125-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
The monosaccharide anhydrides (MAs) levoglucosan, galactosan and mannosan
are products of incomplete combustion and pyrolysis of cellulose and
hemicelluloses, and are found to be major constituents of biomass burning
(BB)
aerosol particles. Hence, ambient aerosol particle concentrations of
levoglucosan are commonly used to study the influence of residential wood
burning, agricultural waste burning and wildfire emissions on ambient air
quality. A European-wide intercomparison on the analysis of the three
monosaccharide anhydrides was conducted based on ambient aerosol quartz
fiber filter samples collected at a Norwegian urban background site during
winter. Thus, the samples' content of MAs is representative for BB
particles originating from residential wood burning. The purpose of
the intercomparison was to examine the comparability of the great diversity
of analytical methods used for analysis of levoglucosan, mannosan and
galactosan in ambient aerosol filter samples. Thirteen laboratories
participated, of which three applied high-performance anion-exchange
chromatography (HPAEC), four used high-performance liquid chromatography
(HPLC) or ultra-performance liquid chromatography (UPLC) and six resorted
to gas chromatography (GC). The analytical methods used were of such
diversity that they should be considered as thirteen different analytical
methods. All of the thirteen laboratories reported levels of levoglucosan,
whereas nine reported data for mannosan and/or galactosan. Eight of the
thirteen laboratories reported levels for all three isomers.
The accuracy for levoglucosan, presented as the mean percentage error (PE)
for each participating laboratory, varied from −63 to 20%; however,
for 62% of the laboratories the mean PE was within ±10%, and
for 85% the mean PE was within ±20%. For mannosan, the
corresponding range was −60 to 69%, but as for levoglucosan, the
range was substantially smaller for a subselection of the laboratories;
i.e. for 33% of the laboratories the mean PE was within ±10%.
For galactosan, the mean PE for the participating laboratories ranged from
−84 to 593%, and as for mannosan 33% of the laboratories
reported a mean PE within ±10%.
The variability of the various analytical methods, as defined by their
minimum and maximum PE value, was typically better for levoglucosan than for
mannosan and galactosan, ranging from 3.2 to 41% for levoglucosan, from
10 to 67% for mannosan and from 6 to 364% for galactosan. For the
levoglucosan to mannosan ratio, which may be used to assess the relative
importance of softwood versus hardwood burning, the variability only ranged
from 3.5 to 24 .
To our knowledge, this is the first major intercomparison on analytical
methods used to quantify monosaccharide anhydrides in ambient aerosol filter
samples conducted and reported in the scientific literature. The results
show that for levoglucosan the accuracy is only slightly lower than that
reported for analysis of SO42- (sulfate) on filter samples, a
constituent that has been analysed by numerous laboratories for several
decades, typically by ion chromatography and which is considered a fairly
easy constituent to measure. Hence, the results obtained for levoglucosan
with respect to accuracy are encouraging and suggest that levels of
levoglucosan, and to a lesser extent mannosan and galactosan, obtained by
most of the analytical methods currently used to quantify monosaccharide
anhydrides in ambient aerosol filter samples, are comparable.
Finally, the various analytical methods used in the current study should be
tested for other aerosol matrices and concentrations as well, the most
obvious being summertime aerosol samples affected by wildfires and/or
agricultural fires. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|