Terpenes in a conifer forest: Detection at sub-parts per billion level without sample preconcentration |
| |
| Institution: | 1. Kardiologické oddělení Interní kliniky, Ústřední vojenská nemocnice a Vojenská fakultní nemocnice, Praha, Czech Republic;2. Vojenský ústav soudního lékařství, Ústřední vojenská nemocnice Vojenská fakultní nemocnice, Praha, Czech Republic;3. Klinika pracovního lékařství 1. lékařská fakulta, Univerzita Karlova v Praze a Všeobecná fakultní nemocnice v Praze, Czech Republic;1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China;4. Guangxi Key Laboratory of Forest Ecology and Conservation, State Key Laboratory for Conservation and Utilization of Agro-bioresources, College of Forestry, Guangxi University, Nanning, Guangxi, 530004, China;5. CREAF, Campus Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Barcelona, 08193, Catalonia, Spain;6. CSIC, Global Ecology Unit CREAF - CSIC-UAB, Bellaterra, Barcelona, 08193, Catalonia, Spain;1. Poznan University of Life Sciences, Faculty of Forestry, Wojska Polskiego St. 71A, 60-625 Poznan, Poland;2. Poznan University of Medical Sciences, Department of Organic Chemistry, Collegium Chemicum, Grunwaldzka St. 6, 60-780, Poznan, Poland |
| |
| Abstract: | In a natural atmosphere free from anthropogenic emissions, terpenes constitute a major part of the biogenic hydrocarbon family. The study of their involvement in chemical reactions with various oxidants in the atmosphere requires continuous and accurate checking of their diurnal concentration variations. In past studies, the ever present sample preconcentration step with large sample volumes is expected to be associated with the problems of sample loss or chemical modifications in addition to their limitations on the measurement frequency. To improve upon these drawbacks, a commercially available microprocessor-based portable gas chromatograph with an ultra-sensitive detector was successfully tested and used for in situ measurements. With a direct sample volume of a few hundred microlitres of ambient air and suitable selection of the column packing material, quick separation of the various components was achieved. Excellent operational features and on-line calibration with pure samples allowed accurate and instant measurements during field studies. The photoionization (PI) detector allowed high S/N ratio even at sub-parts per billion level concentration of the hydrocarbons. Data collected over a one-year period under varying meteorological conditions from a conifer forest situated at Gulmarg (34°03′N, 74°24′E, 2650 m MSL) indicates the suitability of this system for remote field studies and also throws light on the lifecycle of these hydrocarbons in the natural atmosphere. The different hydrocarbons measured in this evaluation study includes isoprene, α-pinene and β-pinene. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
