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X-ray emission spectra was found to be an effective method for the observation of the chemical form of particulate sulfur in ambient air. Realizing the unique spectral characteristics of sulfate, an instrument for analyzing pollution filters for sulfate concentrations can be considered. A knowledge of the peak positions and relative peak intensities dispenses with the need to perform time consuming scans. A sealed, helium fille Bragg spectrometer that allows for precise external rotation of the diffracting crystal would permit consecutive measurements of the peak counting rates. A detailed investigation of the K..beta../K..beta..' ratio (observed to be about 3 to 1) through a least squares comparison with a standard sulfate sample would yielded information concerning the sulfate concentration. Any counts remaining in the main peak after removing the sulfate contribution can be attributed to other forms of sulfur, most notably sulfides.

Application of x-ray emission spectra to the identification of particulate sulfur compounds in ambient air