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Identification of trace elements in ambient air can add substantial  information to pollution source apportionment studies, although they  do not contribute significantly to emissions in terms of  mass. A method for quantitative size and time-resolved trace element  evaluation in ambient aerosols with a rotating drum impactor and  synchrotron radiation based X-ray fluorescence is presented. The  impactor collection efficiency curves and size segregation  characteristics were investigated in an experiment with oil and salt  particles. Cutoff diameters were determined through the ratio of size  distributions measured with two particle sizers. Furthermore, an  external calibration technique to empirically link fluorescence  intensities to ambient concentrations was developed. Solutions of  elemental standards were applied with an ink-jet printer on thin films  and area concentrations were subsequently evaluated with external wet  chemical methods. These customized and reusable reference standards  enable quantification of different data sets analyzed under varying  experimental conditions

Quantitative sampling and analysis of trace elements in atmospheric aerosols: impactor characterization and Synchrotron-XRF mass calibration