the solution for online trace gas analysis

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THE SOLUTION FOR ONLINE TRACE GAS ANALYSISTHE SOLUTION FOR ONLINE TRACE GAS ANALYSIS


Very low detection limit (pptv-range)Real-time quantification of compoundsOnline VOC monitoringNo sample preparation – direct injection

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The Technology


The ion source:

• H3O+ is produced• Protonated water

e- + H2O H2O+ + 2e- H2O+ + H2O H2O·H+ + OH

3


The reaction chamber:

+ N2 + O2 H2O·H+ + Ar no reaction + CO2 + CH4

+ C3H6 C3H6·H+ + C6H6 C6H6·H+ + CH3OH CH3OH·H+ + H2O + CH3CN CH3CN·H+ + CH3SH CH3SH·H+



• No reaction with common constituents of air• No loss of primary ions • Trace gas concentration is linear to ion count rates

Very low detection limit of down to Very low detection limit of down to 5 pptv5 pptv

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• Proton Transfer Reaction – ionisation method• Ultra soft technique compared to charge transfer

or electron impact

Very low mass fragmentationVery low mass fragmentation

Mass Fragmentation:

0

5

10

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30

35

40

Methanol Ethanol Acetaldehyd

0

5

10

15

20

25

30

35

Häu

figke

it


15 20 25 30 35 40 45 50

0

5

10

15

20

25

30

35

Masse [amu]


Electron impactabout. 70eV

Charge transferwith Xe+

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The detection system:

• Quadrupole mass spectrometer• SEM / Channeltron detector• Quantification of trace compounds

Very fast Very fast -- response time about response time about 100 ms100 ms


The advantages:

• Detection threshold of down to 5 pptv• Real-time online measurement• Soft ionization method – low fragmentation• No sample preparation – direct injection• Fast and accurate quantification of masses

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The PTR-MS product range:

Over 100 instruments sold to Europe, USA, Canada, Australia, Japan, New Zealand, China, Korea…

• Ultra-Sensitive• Real time• Online VOC detector

• 5 pptv• 1 – 512 amu

(2048 on request)

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• Sensitive• Real time• Online VOC detector

• 30 pptv• 1 – 512 amu

• Compact• Real time• Online VOC detector

• Short start up time• Small and light• Easy to handle• 1-300 amu• 500 pptv

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Customized…

…Solutionstailored to your needs!

Measurement campaigns with several PTR-MS systems:• in the air• in the sea


Application fields of PTR-MS:

Environmental research• Atmospheric chemistry• Emissions control• Leaf wounding VOC detection

Food and aroma research• Coffee headspace measurement• Aroma science• Nose space air analysis

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Application fields of PTR-MS:

Ambient air control• Indoor air VOC detection• Cleanroom environment analysis

Industrial applications• Waste incineration process control• Production process control• Quality control• Cleanroom testing in microelectronics industry


Indoor air quality measurement– VOC detection in offices, buildings, cars,

planes…

• Real time monitoring• Total VOC concentration• VOCs can be harmful• Sick building syndrome

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Cleanroom AMC monitoring– Airborne molecular contamination – Microelectronics industry

• Hazing of wafers, optics• Production downtime• Real time• Online• Process analysis

Picture: copyright by AMTC


Waste incinerator dioxin emissions monitoring– Dioxin surrogates and VOC detection – Process control

• Harmful dioxin• Burning process• High time resolution• No sample preparation

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Leaf wound compound measurement– Real-time PTR-MS application– Wound reactions after cutting

• Leaf aldehydes• Leaf alcohols


Plant defense mechanisms– Caterpillar attack– VOCs are released, wasps are attracted

1.E-01

1.E+00

1.E+01

1.E+02

50 60 70 80 90 100 110 120 130 140 150

cycle

conc

entr

atio

n [p

pb]

m:73.0 (MEK, methylpropanal)m:83.0 (hexenol)m:118.0 (indole)

Picture: Held

Scheme: Alborn et al. (1997). Science 276: 945-949

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Effects of passive smoking– Acetonitrile in the breath of non-smokers– Quantification of harmful passive smoking

Picture: Pixelquelle.de


Environmental pollution analysis– VOC measurement in 3105m – at the meteorological station Sonnblick

ppt-levelsvoc detection

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Food and flavor science– Nose space air analysis – Swallowing of strawberry flavored drink

High time resolution0

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5 15 25 35 45 55 65 75 85 95

time [s]

coun

trat

e [c

ps]

isoprene

ethylbutyrate


Food aroma research– Coffee head space measurement – Instant coffee aroma when adding boiling water

High time resolutionPicture: Pixelquelle.de

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Flavour SciencePrediction of the overall sensory profile of espresso coffee by on-line headspace measurement

CoffeeBitter

Cocoa

Roasted

WoodyCerealButterToffee

Acid

Citrus

Winey

FloweryEspresso n° 1

Sensory evaluation:

CoffeeBitter

Cocoa

Roasted


Acid

Citrus

WineyFlowery

Espresso n° 2

CoffeeBitter

Cocoa

Roasted


Acid

Citrus

WineyFlowery

Espresso n° 3

Predicted sensory profile

Sensory profile (trained panel)

Espresso n°2

0.E+00

2.E+04

4.E+04

0.0 5.0 10.0 15.0 20.0 25.0 30.0

Time [min]

Inte

nsity

m/z 41 m/z 61

m/z 68 m/z 73

m/z 75 m/z 82

m/z 87 m/z 97

m/z 101

Espresso n°3

0.E+00

2.E+04

4.E+04

0.0 5.0 10.0 15.0 20.0 25.0 30.0

Time [min]

Inte

nsity

m/z 41 m/z 61

m/z 68 m/z 73

m/z 75 m/z 82

m/z 87 m/z 97

m/z 101

Espresso n°1

0.E+00

2.E+04

4.E+04

0.0 5.0 10.0 15.0 20.0 25.0 30.0

Time [min]

Inte

nsity

m/z 41 m/z 61

m/z 68 m/z 73

m/z 75 m/z 82

m/z 87 m/z 97

m/z 101

CoffeeBitter

Cocoa

Roasted


Acid

Citrus

Winey

FloweryEspresso n° 1

MODELIZATION

Picture: Pixelquelle.de


Food processing research– Roasting of arabica beans– Production process control

1.E+00

1.E+01

1.E+02

1.E+03

1.E+04

1.E+05

1.E+06

0 5 10 15 20 25 30 35time [min]

conc

entr

atio

n [p

pb] m33: methanol

m45: acetaldehydem61: acetic acidm69: furanm73: butanal isobutanal pentane butanonem75: propanoic acid ethylformate methylacetate

m80: pyridinem81: pyrazine furfuryl alcoholm83: methyl furan

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Food quality control– Ageing process of meat– Correlation between bacteria population grow and

compounds measured Sum of ethylacetate, methylpropionate and propylformeate

for different meat peaces

0

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1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00

Time at room temperature [hh:mm]Picture: Pixelquelle.de


Acknowledgments:

Prof. Ray Fall, Prof. A. Guenther,Dr. T. Karl, Boulder, Colorado

Dr. M. Staudinger, D.I. M. Mandl ZAMG Salzburg

Prof. T. Märk, Prof. W. Lindinger,Prof. A. Hansel, Dr. G. HanelC. Lindinger, Dr. T. Mikoviny, Dr. E. Hartungen, Dr. A. WisthalerInstitut of Ion Physics, Innsbruck

Prof. P. Crutzen, Dr. R. Holzinger, MPI Mainz

Dr. C. Yeretzian, C. Lindinger P. Pollien, D. Labbe, A. Rytz,M. Juillerat and I. Blank Nestle Research Center

Dr. A. Shimono, Dr. M. NaganumaSanyu Plant Service Co., Ltd.

Dr. E. Hartungen, Dr. A. Jordan,Dr. G. Hanel,Ionicon Analytik GmbH

Dr. M. Held, Dr. T. TurlingsUniversité de Neuchâtel

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Conference Announcement:

33rdrd International PTRInternational PTR--MS Conference 2007MS Conference 2007University Center Obergurgl, Tyrol, Austria.

27. Jan. 07 – 1. Feb. 07

Information and Registration:

www.ptrms-conference.com

Training Seminar:

““handshands--on PTRon PTR--MSMS”” 20072007University Center Obergurgl, Tyrol, Austria.

1. Feb. 07 – 3. Feb. 07

Information and Registration:

www.ptrms-conference.com

the solution for online trace gas analysis

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