Ambient measurements of aromatic and oxidized VOCs by PTR-MS and GC-MS : intercomparison between four instruments in a boreal forest in Finland

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http://hdl.handle.net/10138/161773

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Kajos , M K , Rantala , P , Hill , M , Hellen , H , Aalto , J , Patokoski , J , Taipale , R , Hoerger , C C , Reimann , S , Ruuskanen , T M , Rinne , J & Petäjä , T 2015 , ' Ambient measurements of aromatic and oxidized VOCs by PTR-MS and GC-MS : intercomparison between four instruments in a boreal forest in Finland ' , Atmospheric Measurement Techniques , vol. 8 , no. 10 , pp. 4453-4473 . https://doi.org/10.5194/amt-8-4453-2015

Title: Ambient measurements of aromatic and oxidized VOCs by PTR-MS and GC-MS : intercomparison between four instruments in a boreal forest in Finland
Author: Kajos, M. K.; Rantala, P.; Hill, M.; Hellen, H.; Aalto, J.; Patokoski, J.; Taipale, R.; Hoerger, C. C.; Reimann, S.; Ruuskanen, T. M.; Rinne, J.; Petäjä, T.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Physics
Date: 2015
Language: eng
Number of pages: 21
Belongs to series: Atmospheric Measurement Techniques
ISSN: 1867-1381
URI: http://hdl.handle.net/10138/161773
Abstract: Proton transfer reaction mass spectrometry (PTR-MS) and gas chromatography mass spectrometry GC-MS) are commonly used methods for automated in situ measurements of various volatile organic compounds (VOCs) in the atmosphere. In order to investigate the reliability of such measurements, we operated four automated analyzers using their normal field measurement protocol side by side at a boreal forest site. We measured methanol, acetaldehyde, acetone, benzene and toluene by two PTR-MS and two GC-MS instruments. The measurements were conducted in southern Finland between 13 April and 14 May 2012. This paper presents correlations and biases between the concentrations measured using the four instruments. A very good correlation was found for benzene and acetone measurements between all instruments (the mean R value was 0.88 for both compounds), while for acetaldehyde and toluene the correlation was weaker (with a mean R value of 0.50 and 0.62, respectively). For some compounds, notably for methanol, there were considerable systematic differences in the mixing ratios measured by the different instruments, despite the very good correlation between the instruments (mean R = 0.90). The systematic difference manifests as a difference in the linear regression slope between measurements conducted between instruments, rather than as an offset. This mismatch indicates that the systematic uncertainty in the sensitivity of a given instrument can lead to an uncertainty of 50-100% in the methanol emissions measured by commonly used methods.
Subject: VOLATILE ORGANIC-COMPOUNDS
REACTION-MASS-SPECTROMETRY
URBAN BACKGROUND SITE
SCOTS PINE FOREST
IN-SITU
EXPERIMENT NOMHICE
FLUX MEASUREMENTS
LONG-TERM
NONMETHANE HYDROCARBONS
BIOGENIC EMISSIONS
114 Physical sciences
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