Abstract
X-ray fluorescence spectrometry has a number of attributes that make it especially attractive for the analysis of airborne particulate matter. These include direct analysis of filter deposits without further sample preparation, non-destructiveness, and fairly uniform detectability for all elements from atomic number 9 upward. Atmospheric aerosol samples and samples from power plants, incinerators and other emission sources, typically contain several dozen elements at widely different concentrations, thus presenting many possible interelement line interference problems for some of the x-ray fluorescence analyzers in current use. X-ray crystal (wavelength dispersion) spectrometers with their high resolution capabilities have been rediscovered as ideal instruments for this application. In addition to yielding elemental analyses with minimal data manipulation, they have the potential for identification and concentration measurement of elemental valence states in aerosol samples. A simultaneous multiwavelength spectrometer, containing an array of 16 fixed monochromators and a seguential channel, has been specially equipped and adapted for rapid and routine analysis of large numbers of air pollution samples. The performance of this instrument and results obtained with source and ambient aerosols are discussed.
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