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| Home > Publications database > Automatic gas chromatograph and calibration system for ambient measurements of PAN and PPN |
| Journal Article | PreJuSER-34322 |
; ;
2002
ecomed-Verlagsges.
Landsberg
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Abstract: Background: PAN and its homologues are formed in the atmosphere from the oxidation of organic compounds in the presence of NOx. They are toxic and can provide important information on the origin of enhanced ozone concentrations during so-called smog episodes.Analytics and calibration: A new compact gas chromatograhic system was developed for the automatic analysis of PAN and PPN with a time resolution of less than 10 min and detection limit of 25 ppt.A calibration system was characterised for PAN and PPN. It is based upon the photolysis of acetaldehyde (for PAN) and propanal (for PPN) in the presence of known NO concentrations in a flow reactor. The reaction yield for PAN is 92+/-3%, with CH3ONO2 being the main by-product. The yield for PPN, as derived from the comparison with PAN is slightly higher (close to 100% within the experimental uncertainties). GC and calibration system are controlled by a new computer software, which allows automatic peak integration, recording of important instrumental parameters, and initiation of automatic calibrations.Ambient measurements: PAN and PPN were detected and quantified with the new system in ambient air during measurements made in August 2000 at Julich. The ratio between PPN and PAN was 0.1 in good agreement with data from the literature.
Keyword(s): J ; atmosphere (auto) ; calibration (auto) ; gas chromatography (auto) ; PAN (auto) ; peroxyacetyl nitrate (auto) ; peroxypropionyl nitrate (auto) ; photchemical smog (auto) ; PPN (auto)
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