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Diffusion sampling method for ambient aerosol size discrimination with chemical composition determination



Diffusion sampling method for ambient aerosol size discrimination with chemical composition determination



Analytical Chemistry 48(13): 1999-2001



A method for sampling aerosols is described by which particles below the optical scattering range (< 0.3 .mu.m diameter) can be separated into size-related categories by diffusion, and variations in the chemical composition of S compounds in these particles as a function of size can be identified by filter collection and subsequent analysis. Application of a battery of diffusion cells of appropriate length allows sampling of ambient aerosols for the purpose of chemical speciation of airborne sulfate as a function of particle size with time discrimination of 1-2 h. Representative data illustrating the diffusion sampling method are discussed. Precision and accuracy of the chemical methods for sulfate speciation are .+-. 15% at ambient concentrations and the limit of detection of sulfate and strong acid are, respectively, 2 .mu.g and 0.1 .mu.eq.

Accession: 005161081

Download citation: RISBibTeXText

PMID: 970647

DOI: 10.1021/ac50007a047

Download PDF Full Text: Diffusion sampling method for ambient aerosol size discrimination with chemical composition determination



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