Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Proton Transfer Reaction - Mass Spectrometry (PTR-MS) is a very sensitive technique for online monitoring of volatile organic compounds (VOCs) in ambient air developed by scientists at the Institut fur Ionenphysik at the Leopold-Franzens University in Innsbruck, Austria. A PTR-MS instrument consists of an ion source that is directly connected to a drift tube (in contrast to SIFT-MS no mass filter is interconnected) and an analyzing system (Quadrupole mass analyzer or Time-of-flight mass spectrometer). Commercially available PTR-MS instruments have a response time of about 100ms and reach a detection limit in the single digit pptv region. Established fields of application are environmental research, food and flavour science, biological research, medicine, etc.

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