Premium
Artifact peroxides produced during cryogenic sampling of ambient air
Author(s) -
Staffelbach Thomas,
Neftel Albrecht,
Dasgupta Purnendu K.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl02865
Subject(s) - hydrogen peroxide , artifact (error) , ozone , sampling (signal processing) , isoprene , chemistry , organic peroxide , diffusion , cold trap , environmental chemistry , organic chemistry , polymer , physics , computer science , computer vision , thermodynamics , filter (signal processing) , neuroscience , copolymer , biology
Peroxides were found to be produced as artifacts during cryogenic sampling with Horibe traps. Cryogenic trap sampling was compared to collection with a wet effluent diffusion denuder and a Nafion membrane diffusion denuder. Hydrogen peroxide and hydroxymethyl hydroperoxide measured in the cryogenic trap samples were significantly higher. In comparison, no evidence of artifact methyl hydroperoxide production was found. The amount of artifact H 2 O 2 and HMHP produced increased with decreasing trap temperature. Spiking ambient air with ethene or isoprene showed that these hydrocarbons, in the presence of ozone, can be responsible for the artifact production of peroxides. Our results clearly suggest that the peroxide data obtained by cryogenic sampling and reported in the literature should be interpreted with caution.