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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