| Autor: |
Kravtsov D; Institute of Chemistry, St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia.; Lumex Ltd., ul. Obruchevykh 1b, 195220 St. Petersburg, Russia.; Institute for Analytical Instrumentation of the Russian Academy of Sciences, ul. Ivana Chernykh, 31-33, lit. A, 198095 St. Petersburg, Russia., Gubal A; Institute of Chemistry, St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia.; Lumex Ltd., ul. Obruchevykh 1b, 195220 St. Petersburg, Russia., Chuchina V; Institute of Chemistry, St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia.; Lumex Ltd., ul. Obruchevykh 1b, 195220 St. Petersburg, Russia., Ivanenko N; Lumex Ltd., ul. Obruchevykh 1b, 195220 St. Petersburg, Russia., Solovyev N; School of Science, ATU Sligo, Atlantic Technological University, Ash Lane, F91 YW50 Sligo, Ireland., Stroganov A; Lumex Ltd., ul. Obruchevykh 1b, 195220 St. Petersburg, Russia., Jin H; Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.; National Engineering Research Center for Nanotechnology, Shanghai 200241, China., Ganeev A; Institute of Chemistry, St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia.; Lumex Ltd., ul. Obruchevykh 1b, 195220 St. Petersburg, Russia. |
| Abstrakt: |
Glow discharge (GD) source gained an increased level of attention in relation to the analysis of volatile organic compounds (VOCs) since past work showed that this soft ionization method allowed direct analysis of VOCs with minimal fragmentation, however, the issue of fragmentation was not previously studied in detail. The aim of the present work was to investigate the effect of discharge conditions on VOC fragmentation in the system consisting of the cell with pulsed glow discharge and a time-of-flight mass spectrometer. Ionization of VOCs of different classes (hydrocarbons, alcohols, esters, and carboxylic acids) was investigated. A copper cathode with flat geometry was used. VOCs were ionized in the afterglow of short pulse glow discharge in the air. The use of discharge afterglow significantly reduces or eliminates the effects of ionization mechanisms other than Penning process, in particular, electron ionization. This significantly reduced VOC fragmentation and provided rather low limits of detection. Specific cluster formation was observed for alcohols and esters, which may facilitate their identification. |
