Aerodyne aerosol mass spectrometer

State-of-the-art methods include the combination of source apportionment models with high time-resolved source apportionment techniques for organic aerosols datasets using the Aerodyne Aerosol Mass Spectrometer (AMS), obtaining contributions from primary organic emissions from traffic [60, 61]. 

Fig. 6.2 Schematic of an Aerodyne aerosol mass spectrometer (AMS). Vaporized aerosol species are ionized and analyzed via mass spectrometry. This figure shows the ion attachment version of ionization methods. Other existing versions of the AMS that utilize several unique ionization methods and developments that are not shown in this schematic are discussed in the text. Extended drawing of flash vaporizer system shows that the particle beam first impacts on a vaporizer, and volatile aerosol components that vaporize are subsequently subjected to cationization. The unique feature of this detection scheme is the fact that a vaporizer is directly coupled into an ion attachment technique to enable a two-step particle vaporization and ionization process. The separation of the vaporization and ionization processes allows for quantitative detection of aerosol mass with the AMS. (Reprinted with permission from Ref [8]. 2007, John Wiley and Sons)...

Canagaratna MR, Jayne JT, Jimenez JL, Allan JD, Alfarra MR, Zhang Q, Onasch TB, Drewnick F, Coe H, Middlebrook A, Delia A, Williams LR, Trimbom AM, Northway MJ, DeCarlo PF, Kolb CE, Davidovits P, Worsnop DR. Chemical and microphysical characterization of ambient aerosols with the aerodyne aerosol mass spectrometer. Mass Spectrom Rev. 2007 26 185 222. 

Jimenez JL, Jayne JT, Shi Q, Kolb CE, Worsnop DR, Yourshaw I, Seinfeld JH, Flagan RC, Zhang XF, Smith KA, Morris JW, Davidovits P (2003) Ambient aerosol sampling using the aerodyne aerosol mass spectrometer. J Geophys Res Atmos 108 1-13... 

Fig. 6 Bubble diagram depicting maximum measured surface tension depression for organic surfactant species in aqueous solution (from Tables 2, 3, 4 and 7) as a function of average carbon oxidation state (OSc) in the molecule and number of carbon atoms (iic) [296]. The size of the bubble is proportional to the maximum measured departure from the surface tension of water (72 mN m ) for each species. Also shown are typical values of (OSc) and c for atmospheric organic aerosol material as classified from Aerodyne Aerosol Mass Spectrometer measurements. HOA indicates hydrocarbon-like organic aerosol, BBOA is biomass buming aerosol, SV-OOA is semivolatile oxidized organic aerosol, and LV-OOA is low-volatility oxidized organic aerosol...

PMF has successfully been applied to data from aerosol mass spectrometers (AMS, Aerodyne Research Inc., Billerica) for identification of the main sources of particulate organic matter, OM [9,12, 39], AMS instruments allow measurement of the mass spectra of the non-refractory fraction of approximately PM1 with high temporal resolution and determination of the concentration of particulate OM, which can be converted to OC by multiplication by a conversion factor [40]. 

Aerodyne Research. Aerosol Mass Spectrometer, http //www.aerodyne.com/ products/aerosol-mass-spectrometer (accessed March 26, 2015). 

---