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| Titel |
Development of a new Long Path Absorption Photometer (LOPAP) instrument for the sensitive detection of NO2 in the atmosphere |
| VerfasserIn |
G. Villena, I. Bejan, R. Kurtenbach, P. Wiesen, J. Kleffmann |
| 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 ; 4, no. 8 ; Nr. 4, no. 8 (2011-08-29), S.1663-1676 |
| Datensatznummer |
250002082
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| Publikation (Nr.) |
 copernicus.org/amt-4-1663-2011.pdf |
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| Zusammenfassung |
| A compact and simple instrument for the sensitive detection of NO2 in
the atmosphere has been developed. NO2 is sampled in a stripping coil
by a selective chemical reaction, converted into a highly absorbing dye,
which is detected by long path absorption in a liquid core waveguide.
Several interferences were quantified in the laboratory which so far can all
be neglected. The significant interferences against HONO and O3 were
suppressed by using an upstream HONO/O3-scrubber. The instrument has a
detection limit of 2 pptv, an accuracy of 10 % and a precision of 0.5 % for 3 min time resolution. Thus, the new NO2-LOPAP technique is
more sensitive than known commercial NO2 instruments. The new analyzer
is much simpler to apply than other highly sensitive and selective NO2
methods, e.g. LIF or REMPI methods. The new instrument allows an absolute
calibration that can be easily performed with liquid nitrite standards,
which is a significant advantage compared with other NO2 measurement
techniques for which NO2 calibration gas mixtures are typically
necessary. The new instrument has been validated against the
chemiluminescence technique during an urban field campaign and against the
FTIR technique in a smog chamber under complex photosmog conditions. The
data sets exhibit high correlation and excellent agreement. |
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