Transcript Folie 1 - Copernicus

GC-PTR-TOF
(Gas Chromatography Proton Transfer Reaction Time Of Flight)
EGU talk 24.04.2012
S. Langebner1*, C. Hasler1, R. Schnitzhofer1, I. Herdlinger-Blatt1, F. Brilli2, M. Jocher3, and A. Hansel1
1
Institute for Ion Physics and Applied Physics, University of Innsbruck, Austria;
2
3
IONICON Analytik GmbH, Innsbruck, Austria;
Agroscope ART, Federal Research Institute, Zurich, Switzerland;
* [email protected] ;
Institute of Ionphysics and Applied Physics - University Innsbruck
1
X
I. Introduction & Setup
2
X
Starting Point and Challenges
GC:

increased sensitivity:

real time measurements:

selectivity:
PTR-TOF:
( SRI )
PTR-TOFet[GRAUS
2010] allows
Based on the GC-FID-PTR-Quadrupole-MS
idea (Davison
al., 2008):
GC made a decisive
to separate isobaric compounds
contribution
to the
Combine the advantage
of a GC (separation
capability,
sample
(high
mass resolution) and
understanding
of
the
preconcentration) and of an even more advanced PTR-TOF
detector
(with real
record whole
mass spectra
atmospheric composition
within a fraction of a second
time analysis, soft but
ionization,
low track
LoD, fast
can hardly
the duty cycle, isobaric separation).
I.Intro
II.Results
III.Outlook
dynamics of the
atmospheric reactor…
(fast duty cycle). Isomeric
VOCs, however, still remain
largely undistinguishable…
3
X
Used GC and PTR-TOF





"HP 5890 Series 2 plus" GC
AGILENT column designed for the analysis
of volatile priority pollutants
N2 carriergas
GERSTEL "Online TDS G"
consisting of
- a "Thermo Desorption System" (TDS)
- and a "Cold Injection System" (CIS),
- with TENAX® TA
our PTR-TOF prototype
I.Intro
II.Results
III.Outlook
4
X
Combined GC-PTR-TOF setup
GC-PTRdirect
PTRTOF
measurement
I.Intro
II.Results
III.Outlook
5
X
Detailed Measurement Cycle
I.Intro
II.Results
III.Outlook

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.
6
X
II. Results
7
X
Fragmentation of outside air
137,13amu
101,097amu
fragmentation
83,086amu
I.Intro
II.Results
III.Outlook
516s
510s
81,07amu
+

Retention times of protonated (PTR with H3O ) compounds with
Ambient isomeric
composition and isobaric information
abundance relative to their fragments as indicated by colors.
of fragmentation in the whole mass-range.
8
X
Continuous TOF vs. GC comparison
I.Intro
II.Results
III.Outlook

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
X
III. Outlook & Summary
10
X
So have we achieved our goal?
GC-PTR-TOF: 

Increased sensitivity:


Selectivity:

Real time measurements:
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
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
11
X
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]
I.Intro
II.Results
III.Outlook
and…

Markus JOCHER from ART Zürich

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.

“Förderungsstipendium der Universität 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
12
X
Questions
Thank you for your attention!
and…
„Does anyone have any
questions for my answers?“
[Henry KISSINGER]
I.Intro
II.Results
III.Outlook
13
X