title: Wet effluent diffusion denuder: The tool for determination of monoterpenes in forest.
abstract: Three methods, i.e., the cylindrical wet effluent diffusion denuder (CWEDD)-GCMS, Tenax tubes-GCMS and Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-TOF-MS) were compared for the determination of monoterpenes in forest. While the on-line technique (PTR-TOF-MS) allows only for the measurement of sum of monoterpenes, both the off-line preconcentration techniques (CWEDD and Tenax tubes) are suitable for the determination of concentrations of individual monoterpenes due to subsequent analysis of samples by GCMS. The CWEDD-GCMS is the only method that allows sampling of individual monoterpenes with short time intervals of 2-5min. Monoterpenes are absorbed into a liquid (n-heptane), flowing down on the inner wall of the CWEDD, and then the collected liquid with monoterpenes is immediately taken away for the GCMS analysis, which minimizes time when collected monoterpenes are exposed to oxidants presented in the air during sampling. The limits of detection of CWEDD-GCMS are in the range 1-7pptv for individual monoterpenes.
authors.affiliation: Institute of Analytical Chemistry of the CAS, v. v. i., Veveří 97, 60200 Brno, Czech Republic. Electronic address: krumal@iach.cz.
authors.forename: Kamil
authors.initials: K
authors.lastname: Křůmal
authors.affiliation: Institute of Analytical Chemistry of the CAS, v. v. i., Veveří 97, 60200 Brno, Czech Republic.
authors.forename: Pavel
authors.initials: P
authors.lastname: Mikuška
authors.affiliation: Global Change Research Centre of the CAS, v. v. i., Bělidla 986/4a, 60300 Brno, Czech Republic.
authors.forename: Kristýna
authors.initials: K
authors.lastname: Večeřová
authors.affiliation: Global Change Research Centre of the CAS, v. v. i., Bělidla 986/4a, 60300 Brno, Czech Republic.
authors.forename: Otmar
authors.initials: O
authors.lastname: Urban
authors.affiliation: National Research Council, Institute of Agroenvironmental and Forest Biology, Via Guglielmo Marconi 2, 05010 Porano, Italy.
authors.forename: Emanuele
authors.initials: E
authors.lastname: Pallozzi
authors.affiliation: Institute of Analytical Chemistry of the CAS, v. v. i., Veveří 97, 60200 Brno, Czech Republic.
authors.forename: Zbyněk
authors.initials: Z
authors.lastname: Večeřa
mesh_terms: D065928:Forests; D006536:Heptanes; D013058:Mass Spectrometry; D039821:Monoterpenes / Q000032:analysis*
chemical_list: D006536:Heptanes; D039821:Monoterpenes
keywords: Biogenic volatile organic compounds; Diffusion denuder; Forest; Monoterpene; Proton-Transfer-Reaction Mass Spectrometry; Tenax tubes