WIT Press


Effect Of Nitrate Evaporation On The Determination Of PM2.5 By Virtual Impactor

Price

Free (open access)

Paper DOI

10.2495/EURO991832

Volume

36

Pages

4

Published

1999

Size

281 kb

Copyright

WIT Press

Author(s)

T.A. Pakkanen C.H. Ojanen, V.M. Kerminen, R.E. Hillamo, J. Merilainen, P. Aarnio, T. Koskentalo and K. Hamekoski

Abstract

Effect of Nitrate Evaporation on the Determination of PM2.5 by Virtual Impactor A contribution to subproject SATURN T A Pakkanen\ CH Ojanen\ V.-M. Kerminen\ R.E. Hillamo J. Merilainen\ P. Aarnio^, T Koskentalo^ and K Hamekoski^ * Finnish Meteorological Institute, Sahaajankatu 20 E, FIN-00810 Helsinki, Finland ^Helsinki Metropolitan Area Council, Opastinsilta 6A, FIN-00520 Helsinki, Finland Introduction At present there are several methods for measuring ambient paniculate matter (PM) mass concentrations. These include conventional filter gravimetric weighing methods and modern semi-continuous monitors. However, all methods suffer from some of the following artifacts occurring in the sampled particulates and/or in the collection substrate: 1) evaporation of paniculate species (e.g. water, ammonium nitrate and semivolatile organics); 2) absorption of gaseous components via condensation or via reactions on gas - particle or g

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