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Elemental analysis of aerosol organic nitrates with electron ionization high-resolution mass spectrometry

Elemental analysis of aerosol organic nitrates with electron ionization high-resolution mass spectrometry,10.5194/amt-3-301-2010,Atmospheric Measureme

Elemental analysis of aerosol organic nitrates with electron ionization high-resolution mass spectrometry   (Citations: 2)
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Four hydroxynitrates (R(OH)R'ONO 2) repre- sentative of atmospheric volatile organic compound (VOC) oxidation products were synthesized, nebulized and sam- pled into an Aerodyne High Resolution Time of Flight Aerosol Mass Spectrometer (HR-ToF-AMS). The resulting mass spectrum was used to evaluate calibration factors for elemental analysis of organic nitrates by AMS, and to deter- mine the distribution of nitrogen in the detected fragments in a search for an AMS signature of organic nitrates. We found that 30% of the detected nitrogen mass is in the NO + and NO + 2 fragments, 12% at NH + x fragments, 5% at CxHyOzN + fragments, and 53% at various CxHyN + fragments. Elemen- tal analysis indicated that nitrogen was detected with higher efficiency than carbon and hydrogen, but oxygen was de- tected with reduced efficiency compared to previously re- ported results for a suite of organics which did not include organic nitrates. The results are used to suggest the max- imum corrections to ambient O:C and N:C ratios based on AMS measurements.
Journal: Atmospheric Measurement Techniques , vol. 3, no. 1, pp. 301-310, 2010
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