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000044166 0247_ $$2DOI$$a10.1016/j.ijms.2004.08.012
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000044166 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000044166 084__ $$2WoS$$aSpectroscopy
000044166 1001_ $$0P:(DE-HGF)0$$aAmmann, C.$$b0
000044166 245__ $$aApplication of PTR-MS for measurements of biogenic VOC in a deciduous forest
000044166 260__ $$a[S.l.]$$bElsevier Science$$c2004
000044166 300__ $$a87 - 101
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000044166 440_0 $$02787$$aInternational Journal of Mass Spectrometry$$v239$$x1387-3806
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000044166 520__ $$aThe Vegetation-atmosphere-exchange is an important process controlling the atmospheric concentration of various volatile organic compounds (VOCs) that play a major role in atmospheric chemistry. However, the quantification of VOC exchange on the ecosystem scale is still an analytical challenge. In the present study we tested and applied a proton-transfer-reaction mass spectrometry system (PTR-MS) for the measurement of biogenic VOCs in a mixed deciduous forest, VOC concentrations were from the raw instrument signals based on physical principles. This method allows a consistent quantification also of compounds for which regular calibration with a gas standard is not available. It requires a regular and careful investigation of the mass-dependent ion detection characteristics of the PTR-MS, which otherwise could become a considerable error source. The PTR-MS method was tested in the laboratory for a range of oxygenated and non-oxygenated VOCs using a permeation source. the agreement was within 16% or better, which is well within the expected uncertainty.During the field measurement campaign in a deciduous forest stand, an on-line intercomparison with a state-of-the-art gas-chromatography system showed a generally good agreement. However, the relatively low ambient VOC concentrations revealed some systematic difference for acetone and isoprene, that may indicate an error in the determination of the PTR-MS offset or an interference of an unidentified isobaric compound on the detected ion mass. With the presentation of selected field results, we demonstrate the ability of the PTR-MS system to measure continuous vertical concentration profiles of biogenic VOCs throughout a forest canopy at a time resolution of 20 min. The resulting datasets provide valuable information for the study of the interactions between emission, photochemical transformation and transport processes within and above the forest canopy. (C) 2004 Elsevier B.V. All rights reserved.
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000044166 65320 $$2Author$$aproton-transfer-reaction mass spectrometry
000044166 65320 $$2Author$$aPTR-MS
000044166 65320 $$2Author$$avolatile organic compounds
000044166 65320 $$2Author$$abiosphere-atmosphere exchange
000044166 65320 $$2Author$$adeciduous forest
000044166 7001_ $$0P:(DE-HGF)0$$aSpirig, C.$$b1
000044166 7001_ $$0P:(DE-HGF)0$$aNeftel, A.$$b2
000044166 7001_ $$0P:(DE-HGF)0$$aSteinbacher, M.$$b3
000044166 7001_ $$0P:(DE-Juel1)VDB799$$aKomenda, M.$$b4$$uFZJ
000044166 7001_ $$0P:(DE-Juel1)VDB10108$$aSchaub, A.$$b5$$uFZJ
000044166 773__ $$0PERI:(DE-600)1484635-4$$a10.1016/j.ijms.2004.08.012$$gVol. 239, p. 87 - 101$$p87 - 101$$q239<87 - 101$$tInternational journal of mass spectrometry$$v239$$x1387-3806$$y2004
000044166 8567_ $$uhttp://dx.doi.org/10.1016/j.ijms.2004.08.012
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000044166 9141_ $$y2004
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