Comparison of quartz and Teflon filters for simultaneous collection of size-separated ultrafine aerosol particles and gas-phase zero samples |
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| Authors: | Jevgeni Parshintsev Jose Ruiz-Jimenez Tuukka Petäjä Kari Hartonen Markku Kulmala Marja-Liisa Riekkola |
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| Institution: | (1) Laboratory of Analytical Chemistry, Department of Chemistry, University of Helsinki, PO Box 55, 00014 Helsinki, Finland;(2) Division of Atmospheric Sciences, Department of Physics, University of Helsinki, P O Box 64, 00014 Helsinki, Finland; |
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| Abstract: | In this research, the two most common filter media, quartz and Teflon, were tested to obtain information about the possible
adsorption of gas-phase compounds onto filters during long sample collection of atmospheric aerosols. Particles of nanometer-size
for off-line chemical characterization were collected using a recently introduced differential mobility analyzer for size
separation. Samples were collected at an urban site (Helsinki, SMEARIII station) during spring 2010. Sampling time was 4 to
10 days for particles 50, 40, or 30 nm in diameter. Sample air flow was 4 L/min. The sampling setup was arranged so that two
samples were obtained for each sampling period almost simultaneously: one containing particles and adsorbed gas-phase compounds
and one containing adsorbed gas-phase compounds only. Filters were extracted and analyzed for the presence of selected carboxylic
acids, polyols, nitrogen-containing compounds, and aldehydes. The results showed that, in quartz filter samples, gas-phase
adsorption may be responsible for as much as 100% of some compound masses. Whether quartz or Teflon, simultaneous collection
of gas-phase zero samples is essential during the whole sampling period. The dependence of the adsorption of gas-phase compounds
on vapor pressure and the effect of adsorption on the deposited aerosol layer are discussed. |
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