Analysis of Hydrogen Peroxide in Los Angeles Atmosphere. Hydrogen Peroxide Analyses during the Carbonaceous Species Methods Comparison Study at Citrus College on August 11-21, 1986

摘要

A novel method for the capture of hydrogen peroxide was used in the analyses of gas phase peroxides in the Los Angeles atmosphere. The method employed the freezing of hydrogen peroxide and water vapor in air, passing through a glass trap cooled by dry ice. The method has the advantage of simplicity of operation, low cost of deployment and little or no artifact formation due to prevention of ozone reaction with organic constituents in the air or on glass surfaces. The range of values were from 0.07-0.90 ppb with maxima during 1200-1600 hrs and minima during 2000-2400 or 2400-0800 hrs. Only total peroxide content was determined in all the samples except two, due to the relatively low concentration of gaseous peroxide. In two samples, H2O2 was discriminated from organic peroxide by catalase. The results showed greater than 95% of total peroxide was H2O2 in both samples.