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Proton Transfer Mass Spectrometry (PTrMS) |


Determination of volatile organic compounds (VOCs) by using PTR TOF MS available in FBK.

Instrument at FBK

KORE Technology (installed in 2011)


PTR/APCI Proton Transfer Reaction/Atmospheric Pressure Chemical Ionisation


Time of Flight Reflectron Analyser for parallel detection

Mass resolution M/dM


Chemical information

Headspace composition

Compounds detectable

Using H3O+ all molecules with proton affinity higher than water

Detection limit

few pptv

PTR-MS is the abbreviation for Proton Transfer Reaction - Mass Spectrometry. The technology is based on reactions of ion donors (usually H3O+), which perform non-dissociative
proton transfer to all VOCs with higher proton affinity. These characteristics result in sensitivity for VOCs in air down to few pptv detection.
The very soft ionization technique avoids mass fragmentation, which enhances the interpretability of mass spectra. A TOF-MS linked to the PTR system offers real-time, high time resolution, high sensitivity detection of all analyte species in parallel. There is no need for time consuming sample preparations or chromatographic separation before injection into the PTR MS inlet.