Keith Bein - Identification of sources of atmospheric PM at the Pittsburgh Supersite. Part II: Quantitative comparisons of single particle, particle number, and particle mass measurements

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      Publication Details (including relevant citation   information):

      Bein, K.J., Zhao, Y., Pekney, N.J., Davidson, C.I., Johnston,   M.V., and A.S. Wexler

           (2006), Identification of sources of   atmospheric PM at the Pittsburgh Supersite. Part II:

           Quantitative comparisons of single   particle, particle number, and particle mass measurements,

           Atmospheric Environment, 40(S2),   S424-S444.

      Abstract:

      A single particle mass spectrometer, RSMS-3, and a MOUDI were   deployed during the Pittsburgh Air Quality Study (PAQS), July   2001-September 2002, to obtain size resolved measurements of   elemental composition for particulate matter (PM) within the   Pittsburgh area.  Elemental mass distributions from analysis   of the MOUDI stages were directly compared to those constructed   using the single particle data, in conjunction with coincident   SMPS measurements, for specific days within the PAQS. 

      Results from one episode on 10/27/01 showed that approximately   80% of the metal containing particles detected on this day   belonged to the Na/Si/K/Ca/Fe/Ga/Pb particle class.  The   density and shape factor of these particles were estimated to be   3.9 +/- 0.8 g/cc and 1.5 +/- 0.2, respectively, and the relative   sensitivity factors for individual metals showed little variation   with respect to particle diameter over the size range of 70-800   nm.   

      Compared to the 10/27/01 episode, there was a larger degree of   variability in the metal containing particles detected during   another episode on 03/14/02.  The Ca and Pb mass   distributions from this day represent an ensemble of externally   mixed particles.  Estimates of particle density were   provided for the dominant particle types, including EC/OC/Ca,   Al/Si/Ca/Fe, EC/OC/Pb and Na/K/Zn/Pb, and estimates of particle   shape factor were provided for the EC/OC/Ca and Na/K/Zn/Pb   classes.  Comparison with the 10/27/01 Ca and Pb mass   distributions revealed that the RSMS data reconstructed the MOUDI   mass much better from the Ca/Pb containing particles detected on   03/14/02 than those observed on 10/27/01, suggesting that the   single particle instrument sensitivity to both Ca and Pb depends   on the particle matrix.

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