Time-integrated thermal desorption for quantitative SIFT-MS analyses of atmospheric monoterpenes

0510108 - ÚFCH JH 2020 RIV DE eng J - Journal Article
Sovová, Kristýna - Spesyvyi, Anatolii - Bursova, M. - Pásztor, Pavel - Kubišta, Jiří - Shestivska, Violetta - Španěl, Patrik
Time-integrated thermal desorption for quantitative SIFT-MS analyses of atmospheric monoterpenes.
Analytical and Bioanalytical Chemistry. Roč. 411, č. 14 (2019), s. 2997-3007. ISSN 1618-2642. E-ISSN 1618-2650
R&D Projects: GA ČR(CZ) GJ17-13157Y
Institutional support: RVO:61388955
Keywords : ion flow tube * volatile organic-compounds * mass-spectrometry * air * breath * emissions * h3o+ * voc * no+ * ti-td/sift-ms
OECD category: Physical chemistry
Impact factor: 3.637, year: 2019
Method of publishing: Limited access

A new time-integrated thermal desorption technique has been developed that can be used with selected ion flow tube mass spectrometry, TI-TD/SIFT-MS, for off-line quantitative analyses of VOCs accumulated onto sorbents. Using a slow desorption temperature ramp, the absolute amounts of desorbed compounds can be quantified in real time by SIFT-MS and constitutional isomers can be separated. To facilitate application of this technique to environmental atmospheric monitoring, method parameters were optimised for quantification of the three common atmospheric monoterpenes:pinene, R-limonene and 3-carene. Three sorbent types, Tenax TA, Tenax GR and Porapak Q, were tested under 26 different desorption conditions determined by the design of experiment, DOE, systematic approach. The optimal combination of type of sorbent, bed length, sampling flow rate, sample volume and the initial desorption temperature was determined from the experimental results by ANOVA. It was found that Porapak Q exhibited better efficiency of sample collection and further extraction for total monoterpene concentration measurements. On the other hand, Tenax GR or TA enabled separation of all three monoterpenes. The results of this laboratory study were tested with the sample accumulated from a branch of a Pinus nigra tree.
Permanent Link: http://hdl.handle.net/11104/0300659