E6.4 - Sensitive Detection of Benzene in the Presence of Interferents by High Kinetic Energy Ion Mobility Spectrometry
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- E6 - Gas Sensors II
- A. Kirk, J. Langejuergen, M. Allers, J. Oermann, S. Zimmermann - Leibniz University Hannover (Germany)
- 693 - 697
Ion mobility spectrometers (IMS) are widely used for fast trace gas detection in air, often achieving limits of detection in the pptv-range (parts per trillion) within one second averaging time due to the typically employed atmospheric pressure chemical ionization (APCI). However, IMS performance is highly dependent on the mixture of analytes present, as various quenching reactions can occur. For example, benzene, which is an important precursor in several processes but highly carcinogenic, is hard to detect under ambient conditions. Using an ion mobility spectrometer operated at high kinetic ion energies, we were able to detect 70 ppbv benzene within two seconds averaging time even under humid conditions (90% r.H.) and in the presence of the common interferents toluene and o-xylene in ppmv-concentrations.