Heidelberg 2006 – wissenschaftliches Programm
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UP: Umweltphysik
UP 19: Neuartige Messverfahren der Umweltphysik
UP 19.3: Fachvortrag
Dienstag, 14. März 2006, 17:00–17:15, A
PTR-MS measurements of HCHO and results from HCHO intercomparison measurements in the atmosphere simulation chamber SAPHIR — •Armin Wisthaler1, Armin Hansel1, Ralf Koppmann2, Theo Brauers2, Jens Boßmeier2, Rainer Steinbrecher3, Wolfgang Junkermann3, Rudi Meier3, Konrad Müller4, Sheena Solomon5, and Arve Bjerke6 — 1Institut für Ionenphysik, Universität Innsbruck, Innsbruck — 2ICG-II, Forschungszentrum Jülich, Jülich — 3IMK-IFU, Forschungszentrum Karlsruhe, Garmisch-Partenkirchen — 4Institut für Troposphärenforschung, Leipzig — 5Institut für Umweltphysik, Universität Bremen, Bremen — 6NILU, Kjeller, Norwegen
Formaldehyde (HCHO) is a key species for studies of photochemical oxidation pathways in the troposphere. Thus far, several techniques for atmospheric HCHO measurements have emerged but the availability of a compact and sensitive instrument for on-line HCHO measurement in the field is desirable. Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) meets the desired criteria to a great extent but previous attempts to use PTR-MS for HCHO measurements have yielded discouraging results. Here, we will present modifications to the PTR-MS technique by which the instrument’s performance for HCHO detection can be significantly improved. Results from intercomparison measurements with other techniques (Hantzsch monitor, DOAS, DNPH/HPLC/UV-VIS) conducted in the atmosphere simulation chamber SAPHIR at the Research Centre Jülich will be presented.