Keith Bein - Field evaluation of the versatile aerosol concentration enrichment system (VACES) particle concentrator coupled to the rapid single particle mass spectrometer (RSMS-3)

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  Publication Details (including relevant citation   information):

  Zhao, Y., Bein, K.J., Wexler, A.S., Misra, C., Fine, P.M. and C.   Sioutas (2005), Field

  evaluation of the versatile aerosol concentration enrichment   system (VACES) particle concentrator coupled to the rapid single   particle mass spectrometer (RSMS-3), J. Geophys. Res., 110, D07S02,   doi:10.1029/2004JD004644.

  Abstract:

  A   field evaluation of versatile aerosol concentration enrichment   system (VACES)

  coupled to a rapid   single-particle mass spectrometer (RSMS-3) was conducted as part   of the U.S. Environmental Protection Agency Supersite program in   Pittsburgh during March 2002. RSMS-3 hit rate increases were   measured, and possible particle composition changes introduced by   the VACES were examined in the single-particle mass spectra. The   hit rates increased by 5–20 times at particle sizes ranging from   40 to 640 nm. VACES only enhances the hit rate by about a factor   of 2 for large particle sizes because the RSMS-3 flow rates for   these particles did not match the optimum operating condition of   VACES. During the 3 days of measurements most of the particles   were a mixture of carbonaceous material and ammonium nitrate with   a variation across the spectrum from particles that were mostly   carbonaceous to particles that were mostly ammonium nitrate. Both   ambient and concentrated carbonaceous and ammonium nitrate   composition distributions were indistinguishable with RSMS-3,   suggesting that VACES introduces an insignificant artifact for   those particles.

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