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AMBIENT AIR MEASUREMENTS OF HYDROGEN PEROXIDE IN THE CALIFORNIA SOUTH COAST AIR BASIN
Citation:
Gay, B., K. Darnall, A. Winer, J. Pitts, Jr., AND G. Kok. AMBIENT AIR MEASUREMENTS OF HYDROGEN PEROXIDE IN THE CALIFORNIA SOUTH COAST AIR BASIN. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-78/123 (NTIS PB298544), 1978.
Description:
Hydrogen peroxide (H2O2) concentrations have been measured at two locations (Claremont and Riverside) in the California South Coast Air Basin during the months of July and August 1977. Three different analytical methods were employed: a chemiluminescent method and two colorimetric procedures. Typical mid-afternoon concentrations of H2O2 during moderate smog episodes (i.e., O3 150-200 ppb) ranged from approximately 10 to 30 ppb. These values are significantly lower than those measured in a study in Riverside in 1970. In general, maximum H2O2 concentrations were observed at about the time of the ozone maximum, but in the course of a day H2O2 levels did not occur in a fixed ratio to O3 concentrations, and in a number of cases the concentrations of H2O2 declined more slowly than those of ozone following the maximum. During this investigation signals corresponding to elevated levels of H2O2 (i.e., approximately 100 ppb) were observed by all three methods when grass or forest fire plumes impacted on the measurement site.