Characterization of gas chromatography/negative ion chemical ionization mass spectrometry for ambient measurement of PAN: Potential interferences and long-term sensitivity drift

Details Characterization of gas chromatography/negative ion chemical ionization mass spectrometry for ambient measurement of PAN: Potential interferences and long-term sensitivity drift Characterization of gas chromatography/negative ion chemical ionization mass spectrometry for ambient measurement of PAN: Potential interferences and long-term sensitivity drift

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2089t&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 14, p. 2089-2092

Computer Science

Performance

3

Atmospheric Composition And Structure: Pollution-Urban And Regional, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Gas chromatography/negative ion chemical ionization mass spectrometry (GC/NICI MS) is characterized, elucidating instrument performance for the continuous measurement of peroxyacetyl nitrate (PAN) and its homologues. Chromatograms and linear response at parts per trillion by volume (pptv) levels are examined to evaluate the accuracy of calibration using 4 types of base gases: dry nitrogen, dry synthetic air, purified compressed air, and thermally PAN-decomposed air. The sensitivity to PAN is further checked against humidity, which may be a source of interference in ambient measurements. The experimental results indicate that oxygen, water vapor, and other trace gases in ambient air do not affect the PAN sensitivity. Although significant sensitivity drifts were observed during the course of measurements made at a remote site in Japan, this problem was overcome by performing frequent calibrations with isopropyl nitrate (IPN).

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