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Atmospheric H2O2 measurement: comparison of cold trap method with impinger bubbling methodCollection of atmospheric H2O2 was performed by a cold trap method using dry ice-acetone as the refrigerant. The air was drawn by a pump into a glass gas trap immersed in the dry ice-acetone slush in a dewar flask at a flow rate of 2.5 l min-1 for approximately 2 h. Collection efficiency was > 99% and negligible interferences by O3, SO2 or organic matter with the collected H2O2 in the trap were observed. This method was compared with the air impinger bubbling method which has been previously described (Kok et al., 1978a, b, Envir. Sci. Technol. 12, 1072-1080). The measured total peroxide (H2O2 + organic peroxide) values in a series of aim samples collected by the impinger bubbling method (0.06-3.7 ppb) were always higher than those obtained by the cold trap method (0.02-1.2 ppb). Laboratory experiments suggest that the difference in values between the two methods probably results from the aqueous phase generation of H2O2 and organic peroxide in the impinger solution by a reaction of atmospheric O3 with olefinic and aromatic compounds. If these O3-organic compound reactions which occur in the impinger also occur in aqueous droplets in the atmosphere, the process could be very important for aqueous phase generation of H2O2 in clouds and rainwater.
Document ID
20040089085
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sakugawa, H.
(Institute of Geophysics and Planetary Physics, University of California at Los Angeles 90024 United States)
Kaplan, I. R.
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Atmospheric environment
Volume: 21
Issue: 8
ISSN: 0004-6981
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: CR80786402-0
CONTRACT_GRANT: CR8-07864
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
Non-NASA Center

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