Development and application of a GC system for NMHC analyses of air samples from the CARIBIC aircraft project

dc.contributor.authorRanda, Bohdan
dc.date.accessioned2008-08-04T09:18:04Z
dc.date.available2008-08-04T11:18:04Z
dc.date.issued2008
dc.description.abstractThe subject of this thesis is the development of a Gaschromatography (GC) system for non-methane hydrocarbons (NMHCs) and measurement of samples within the project CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container, www.caribic-atmospheric.com). Air samples collected at cruising altitude from the upper troposphere and lowermost stratosphere contain hydrocarbons at low levels (ppt range), which imposes substantial demands on detection limits. Full automation enabled to maintain constant conditions during the sample processing and analyses. Additionally, automation allows overnight operation thus saving time. A gas chromatography using flame ionization detection (FID) together with the dual column approach enables simultaneous detection with almost equal carbon atom response for all hydrocarbons except for ethyne. The first part of this thesis presents the technical descriptions of individual parts of the analytical system. Apart from the sample treatment and calibration procedures, the sample collector is described. The second part deals with analytical performance of the GC system by discussing tests that had been made. Finally, results for measurement flight are assessed in terms of quality of the data and two flights are discussed in detail. Analytical performance is characterized using detection limits for each compound, using uncertainties for each compound, using tests of calibration mixture conditioning and carbon dioxide trap to find out their influence on analyses, and finally by comparing the responses of calibrated substances during period when analyses of the flights were made. Comparison of both systems shows good agreement. However, because of insufficient capacity of the CO2 trap the signal of one column was suppressed due to breakthroughed carbon dioxide so much that its results appeared to be unreliable. Plausibility tests for the internal consistency of the given data sets are based on common patterns exhibited by tropospheric NMHCs. All tests show that samples from the first flights do not comply with the expected pattern. Additionally, detected alkene artefacts suggest potential problems with storing or contamination within all measurement flights. Two last flights # 130-133 and # 166-169 comply with the tests therefore their detailed analysis is made. Samples were analyzed in terms of their origin (troposphere vs. stratosphere, backward trajectories), their aging (NMHCs ratios) and detected plumes were compared to chemical signatures of Asian outflows. In the last chapter a future development of the presented system with focus on separation is drawn. An extensive appendix documents all important aspects of the dissertation from theoretical introduction through illustration of sample treatment to overview diagrams for the measured flights.en_GB
dc.identifier.doihttp://doi.org/10.25358/openscience-2608
dc.identifier.urihttps://openscience.ub.uni-mainz.de/handle/20.500.12030/2610
dc.identifier.urnurn:nbn:de:hebis:77-16776
dc.language.isoeng
dc.rightsInC-1.0de_DE
dc.rights.urihttps://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc500 Naturwissenschaftende_DE
dc.subject.ddc500 Natural sciences and mathematicsen_GB
dc.titleDevelopment and application of a GC system for NMHC analyses of air samples from the CARIBIC aircraft projecten_GB
dc.typeDissertationde_DE
jgu.organisation.departmentFB 09 Chemie, Pharmazie u. Geowissensch.
jgu.organisation.nameJohannes Gutenberg-Universität Mainz
jgu.organisation.number7950
jgu.organisation.placeMainz
jgu.organisation.rorhttps://ror.org/023b0x485
jgu.organisation.year2007
jgu.rights.accessrightsopenAccess
jgu.subject.ddccode500
jgu.type.dinitypePhDThesis
jgu.type.resourceText
jgu.type.versionOriginal worken_GB
opus.date.accessioned2008-08-04T09:18:04Z
opus.date.available2008-08-04T11:18:04
opus.date.modified2008-08-04T09:18:04Z
opus.identifier.opusid1677
opus.institute.number0900
opus.metadataonlyfalse
opus.organisation.stringFB 09: Chemie, Pharmazie und Geowissenschaften: FB 09: Chemie, Pharmazie und Geowissenschaftende_DE
opus.subject.othermax-planck-institute mainz analytical method air chemistry automatic measurementsen_GB
opus.type.contenttypeDissertationde_DE
opus.type.contenttypeDissertationen_GB

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