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COMPARISON OF SULFUR MEASUREMENTS FROM A REGIONAL FINE PARTICLE NETWORK WITH CONCURRENT ACID MODES NETWORK RESULTS
Citation:
Bennett, R., L. Stockburger, AND H. Barnes. COMPARISON OF SULFUR MEASUREMENTS FROM A REGIONAL FINE PARTICLE NETWORK WITH CONCURRENT ACID MODES NETWORK RESULTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/307 (NTIS PB94192747).
Description:
The Fine Particle Network (FPN), a system of fine particle (less than 2.5 um) samplers, was operated at 41 sites selected from the Environmental Protection Agency Acid MODES program during a two year period in 1988-90. he 24-hour sample results included fine particle mass and the most predominant chemical element concentrations determined by wavelength dispersive x-ray fluorescence analysis. tatistical summaries of the fine mass and sulfur concentrations by site and season were prepared. he sulfur results from the Fine Particle Network were compared with concurrently measured total particulate sulfate and gaseous SO2 results obtained with colorimetric and ion chromatographic analysis at the same sites operated by the Acid MODES program. he availability of simultaneous particulate sulfate measurements from independent collection and analytical procedures provided an opportunity to examine their agreement and provide a more reliable data base for evaluation of regional particulate models and estimation of contribution to urban aerosol concentration.Although the two networks did not operate entirely on the same schedule, 9188 sets of concurrently collected samples were produced. eometric mean concentrations of fine particle mass (12.9 ug m-3 and particulate sulfur (1.4pg m-3, equivalent to 4.2 ug m-3 of sulfate) were measured with FPN samples along with particulate sulfate (4.0 ug m-3 ) and gaseous sulfur dioxide (6.7 ug m-3) from the Acid MODES filter pack samplers. he distribution of daily ratios of sulfate to sulfur concentrations had a mean value of 2.94 which agrees with the gravimetric factor of 3.