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| Titel |
Intercomparison of Hantzsch and fiber-laser-induced-fluorescence formaldehyde measurements |
| VerfasserIn |
J. Kaiser, X. Li, R. Tillmann, I. Acir, F. Holland, F. Rohrer, R. Wegener, F. N. Keutsch |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 6 ; Nr. 7, no. 6 (2014-06-04), S.1571-1580 |
| Datensatznummer |
250115808
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| Publikation (Nr.) |
 copernicus.org/amt-7-1571-2014.pdf |
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| Zusammenfassung |
| Two gas-phase formaldehyde (HCHO) measurement techniques, a modified
commercial wet-chemical instrument based on Hantzsch fluorimetry and a
custom-built instrument based on fiber laser-induced fluorescence (FILIF),
were deployed at the atmospheric simulation chamber SAPHIR (Simulation of Atmospheric
PHotochemistry In a large Reaction Chamber) to compare the
instruments' performances under a range of conditions. Thermolysis of
para-HCHO and ozonolysis of 1-butene were used as HCHO sources, allowing for
calculations of theoretical HCHO mixing ratios. Calculated HCHO mixing
ratios are compared to measurements, and the two measurements are also
compared. Experiments were repeated under dry and humid conditions (RH < 2% and RH > 60%) to investigate the possibility
of a water artifact in the FILIF measurements. The ozonolysis of 1-butene
also allowed for the investigation of an ozone artifact seen in some
Hantzsch measurements in previous intercomparisons. Results show that under
all conditions the two techniques are well correlated (R2 ≥ 0.997), and linear regression statistics show measurements agree with within
stated uncertainty (15% FILIF + 5% Hantzsch). No water or ozone
artifacts are identified. While a slight curvature is observed in some
Hantzsch vs. FILIF regressions, the potential for variable instrument
sensitivity cannot be attributed to a single instrument at this time.
Measurements at low concentrations highlight the need for a secondary method
for testing the purity of air used in instrument zeroing and the need for
further FILIF White cell outgassing experiments. |
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