 |
| Titel |
Calibration and intercomparison of acetic acid measurements using proton-transfer-reaction mass spectrometry (PTR-MS) |
| VerfasserIn |
K. B. Haase, W. C. Keene, A. A. P. Pszenny, H. R. Mayne, R. W. Talbot, B. C. Sive |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 11 ; Nr. 5, no. 11 (2012-11-15), S.2739-2750 |
| Datensatznummer |
250003172
|
| Publikation (Nr.) |
 copernicus.org/amt-5-2739-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Acetic acid is one of the most abundant organic acids in the ambient
atmosphere, with maximum mixing ratios reaching into the tens of parts per
billion by volume (ppbv) range. The identities and associated magnitudes of
the major sources and sinks for acetic acid are poorly characterized, due in
part to the limitations of available measurement techniques. This paper
demonstrates that, when properly calibrated, proton-transfer-reaction mass
spectrometry (PTR-MS) can be a valuable technique for fast response,
accurate quantification of acetic acid in ambient air. Three different
PTR-MS configurations were calibrated at low ppbv mixing ratios using
permeation tubes, which yielded calibration factors between 7.0 and 10.9
normalized counts per second per ppbv (ncps ppbv−1) at a
drift tube field strength of 132 Townsend (Td). Detection limits ranged from
0.06 to 0.32 ppbv with dwell times of 5 s. These calibration factors
showed negligible humidity dependence. Acetic acid was measured with PTR-MS
on Appledore B Island, ME, during the International Consortium for Atmospheric
Research on Transport and Transformation (ICARTT) campaign and validated
based on acetic acid measured in parallel using tandem mist chambers coupled
with ion chromatography (MC/IC). Mixing ratios ranged from a minimum of
0.075 ± 0.004 ppbv to 3.555 ± 0.171 ppbv, with a median mixing
ratio of 0.530 ± 0.025 ppbv. An orthogonal least squares linear
regression of paired data yielded a slope of 1.14 ± 0.06 (2σ),
an intercept of 0.049 ± 0.020 (2σ) ppbv, and an R2 of
0.78. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|