MEASUREMENT OF FINE PARTICULATE MATTER (NONVOLATILE AND SEMIVOLATILE FRACTIONS) IN FRESNO, CA
Measurements were also made with several continuous species monitors. A recently commercialized Dionex GP-IC instrument was extensively field tested for the first time during this study. Sulfate, nitrate and ammonium concentrations were determined by the Dionex GP-IC. Comparisons were made between the Dionex GP-IC and an R&P Sulfate Monitor and an R&P Nitrate Monitor. Good agreement was observed between sulfate concentrations measured by the Dionex GP-IC and the R&P Sulfate Monitor. However, significant differences were observed during episodes of high humidity between nitrate concentrations measured by the GP-IC and R&P Nitrate Monitor. Continuous particulate carbon measurements were made by an R&P Carbon Monitor, Sunset Labs Carbon Monitor, and an Anderson Aethalometer. Sums of all the major species of an urban aerosol, as determined by the various continuous species monitors, were made and compared to total PM2.5 concentrations measured by the R&P FDMS Monitor. Differences observed in the measurements can be explained by the ability of the various measurement systems to accurately measure semi-volatile organic material and ammonium nitrate. Comparisons were also made between the R&P FDMS and the FRM, and observed differences are explained.
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