Size-Dependent Chemical Composition of Los Angeles Aerosols: A Report on Measurements Made August 8-10, 1984

摘要

Data acquired during a three-day (August 8-10, 1984) intensive field study in Los Angeles are discussed. The sampling site was on the grounds of the City of Hope Hospital in Duarte, California; simultaneous, complementary measurements were made at the same site by Southern California Edison. the primary objective of the CRC-supported research was to evaluate the utility of new aerosol sampling instrumentation for measuring the size-dependent chemical composition of ambient aerosols. Two 30-liter-per-minute microorifice impactors were used to acquire ten size-resolved samples (four size cuts between 0.05 and 2.2 um) for analyses of total organic carbon, elemental carbon, sulfate, and nitrate. Two total filter samplers were also used to measure sub-2.2 um concentrations of total organic carbon, elemental carbon, sulfate, and nitrate. Sample times varied from four to twelve hours, depending on ambient loadings. Three size-resolved samples (three size cuts below 1 um) for organic species analyses were obtained with a 760-liter-per-minute high volume microorifice impactor.