Development & Validation of ToF-ACSM
Validation & results
Low detection limits of 182 ngm-3 for ammonium, 198 ngm-3 for organics, 18 ngm-3 for sulphate, 21 ngm-3 for nitrate, and 11 ngm-3 for chloride were determined. For a comparison with other instruments detection limits cf. Tab. 1
Additionally, the mass resolution of the ToFACSM was determined to be sufficient for basic mass defect resolved peak fitting of the recorded spectra, providing a data stream not accessible to the Q-ACSM. This allows for quantification of certain hydrocarbon and oxygenated fragments (e.g. C3H7+ and C2H3O+, both occurring at m/Q = 43 Th), as well as improving inorganic/organic separation.
Journal ArticlesA technical paper about the ToF-ACSM was published in AMT. A second publication about the findings of the long term deployment of the ToF-ACSM at the high altitude site is in preparation.
The ToF-ACSM: a portable aerosol chemical speciation monitor with TOFMS detection, R. Fröhlich, M. J. Cubison, J. G. Slowik, N. Bukowiecki, A. S. H. Prévôt, U. Baltensperger, J. Schneider, J. R. Kimmel, M. Gonin, U. Rohner, D. R. Worsnop, and J. T. Jayne, Atmos. Meas. Tech. 6, 3225-3241 (2013)
Conference Contributions* Year-round, on-line mass spectrometric PM1 measurements at the high altitude station Jungfraujoch (CH), Roman Fröhlich, Jay G. Slowik, André S. H. Prévôt and Urs Baltensperger, International Aerosol Conference (IAC), August 28 - September 2, 2014, Busan, Republic of Korea
* Q-ACSM on the Jungfraujoch 13.06.12-14.11.12, Roman Fröhlich, Jay Slowik, André Prévôt and Urs Baltensperger, ACTRIS ACSM meeting side-by-side with 14th EMEP Task Force on Measurements and Modelling (TFMM), May 05-06, 2013, Zagreb, Croatia
* Year-round measurement of pm1 chemical composition in the Swiss Alps using a Time-of-Flight Aerosol Chemical Speciation Monitor (ToF-ACSM), Roman Fröhlich, Michael Cubison, Jay Slowik, André Prévôt, Urs Baltensperger, Urs Rohner, Marc Gonin, Joel Kimmel, Douglas Worsnop and John Jayne, European Aerosol Conference (EAC), September 02-06, 2013, Prague, Czech Republic, rewarded with a Poster Award
* A novel compact aerosol mass spectrometer - the ToF-ACSM: Instrument performance and first field deployment, Roman Fröhlich, Michael Cubison, Jay Slowik, André Prévôt, Urs Baltensperger, Urs Rohner, Marc Gonin, Joel Kimmel, Douglas Worsnop and John Jayne, European Aerosol Conference (EAC), September 02-06, 2012, Granada, Spain