Demonstration of Proton-Transfer Reaction Time-of-Flight Mass Spectrometry for Real-Time Analysis of Trace Volatile Organic Compounds

摘要

A proton-transfer reaction mass spectrometer based on time-of-flight mass Spectrometry is described.This instrument couples a radioactive ion source and drift tube with a reflectron time-of-flight mass spectrometer.Volatile organic compounds in the gas phase with concentrations at the parts per billion by volume level can be detected in a matter of seconds,and crucially,the multichannel data acquisition in TOF-MS means that this detection sensitivity is available in all mass channels simultaneously.The typical mass resolution (m/DELTAm) is in excess of 1000.The performance of the instrument is demonstrated using urban air measurements and a linear response/calibration test.