(Gas Chromatography Proton Transfer Reaction Time Of Flight) EGU talk 24.04.2012 1 GC-PTR-TOF...
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- Slide 1
- (Gas Chromatography Proton Transfer Reaction Time Of Flight)
EGU talk 24.04.2012 1 GC-PTR-TOF Institute of Ionphysics and
Applied Physics - University Innsbruck S. Langebner 1 *, C. Hasler
1, R. Schnitzhofer 1, I. Herdlinger-Blatt 1, F. Brilli 2, M. Jocher
3, and A. Hansel 1 1 Institute for Ion Physics and Applied Physics,
University of Innsbruck, Austria; 2 IONICON Analytik GmbH,
Innsbruck, Austria; 3 Agroscope ART, Federal Research Institute,
Zurich, Switzerland; * stephan.langebner@uibk.ac.at ; X
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- 2 I. Introduction & Setup X
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- 3 Starting Point and Challenges increased sensitivity: real
time measurements: selectivity: ( SRI ) GC made a decisive
contribution to the understanding of the atmospheric composition
but can hardly track the dynamics of the atmospheric reactor GC:
PTR-TOF: PTR TOF [GRAUS 2010] allows to separate isobaric compounds
(high mass resolution) and record whole mass spectra within a
fraction of a second (fast duty cycle). Isomeric VOCs, however,
still remain largely undistinguishable X Based on the
GC-FID-PTR-Quadrupole-MS idea (Davison et al., 2008): Combine the
advantage of a GC (separation capability, sample preconcentration)
and of an even more advanced PTR-TOF detector (with real time
analysis, soft ionization, low LoD, fast duty cycle, isobaric
separation). I.Intro II.Results III.Outlook
- Slide 4
- 4 Used GC and PTR-TOF X GERSTEL "Online TDS G" consisting of -
a "Thermo Desorption System" (TDS) - and a "Cold Injection System"
(CIS), - with TENAX TA our PTR-TOF prototype "HP 5890 Series 2
plus" GC AGILENT column designed for the analysis of volatile
priority pollutants N 2 carriergas I.Intro II.Results
III.Outlook
- Slide 5
- 5 Combined GC-PTR-TOF setup X direct PTR- TOF measurement
GC-PTR- TOF measurement I.Intro II.Results III.Outlook
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- 6 Detailed Measurement Cycle The 60min cycle starts with a
15min direct PTR-TOF measurement while TDS/CIS sampling takes place
simultaneously followed by a 45min GC-PTR-TOF run. X I.Intro
II.Results III.Outlook
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- 7 II. Results X
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- 8 Fragmentation of outside air Retention times of protonated
(PTR with H 3 O + ) compounds with abundance relative to their
fragments as indicated by colors. X 101,097amu 83,086amu 510s516s
137,13amu 81,07amu fragmentation Ambient isomeric composition and
isobaric information of fragmentation in the whole mass-range.
I.Intro II.Results III.Outlook
- Slide 9
- Comparison of a three day outside air monoterpene measurement
with the blue line showing the ambient monoterpene concentration
sum measured directly by PTR-TOF during TDS sampling. The colored
bars show the separated monoterpene concentrations with the
GC-PTR-TOF. 9 Continuous TOF vs. GC comparison I.Intro II.Results
III.Outlook X
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- 10 III. Outlook & Summary X
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- 11 So have we achieved our goal? Increased sensitivity:
Selectivity: Real time measurements: GC-PTR-TOF: Use micro packed
columns for more flow requiring less dilution Use a GERSTEL Modular
Accelerated Column Heater (MACH GC) or specialized columns for
faster programs X all this over -whole massrange with a high
dutycycle, -quantitative, -at ambient concentrations, -selectivity
for isomeric separation (sum formulas for fragments) I.Intro
II.Results III.Outlook
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- 12 Acknowledgements I want to show my sincere appreciation of
the inspiring assistance and motivating cooperation by thanking all
the diploma students, PhD students and postdocs of my group with
the following quote: Coming together is a beginning. Keeping
together is progress. Working together is success. [Henry FORD] and
Markus JOCHER from ART Zrich Dr. Jens HERBIG from Ionimed Analytic
Ges.m.b.H. for the disussions and exchange after my presentations
GERSTEL Support This research has received funding from the
Austrian Science Fund (FWF): Project Number I655-B16.
Frderungsstipendium der Universitt Innsbruck, 2011 This work was
thoroughly presented 2011 in a seminar talk in Innsbruck at the
Institute of Ionphysics and Applied Physics and presented as a
Poster (A51A-0210) at the 2011 AGU Fall Meeting publication is in
preparation I.Intro II.Results III.Outlook X
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- 13 Questions Thank you for your attention! and Does anyone have
any questions for my answers? [Henry KISSINGER] I.Intro II.Results
III.Outlook X