Quantitative reduction of particulate nitrate to nitric oxide by a molybdenum catalyst: Implications for NOy measurements in the marine boundary layer

Details Quantitative reduction of particulate nitrate to nitric oxide by a molybdenum catalyst: Implications for NOy measurements in the marine boundary layer Quantitative reduction of particulate nitrate to nitric oxide by a molybdenum catalyst: Implications for NOy measurements in the marine boundary layer

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3521810s&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 21, CiteID L21810

Physics

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

NaNO3 is one of the most important species in total odd nitrogen oxides (NO y ), especially with respect to nitrogen supply to the ocean as a nutrient. The reduction efficiencies (RE) of NaNO3 by a molybdenum catalyst were measured in order to investigate the contribution of nitrates to the measurement of NO y . NaNO3 particles with 3-μm diameter were reduced to NO quantitatively by a molybdenum catalyst. However, RE decreased with particle diameter to 49.3 +/- 9.1% (1σ) for NaNO3 particles with 9-μm diameter. Meanwhile, quantitative reduction was observed for NaNO3/NaCl particles regardless of particle diameter. RE was 92.6 +/- 2.8% (1σ) for NaNO3/NaCl particles even as large as 12-μm diameter. The decrease of RE with particle diameter for NaNO3 is caused by the nitrate concentrations rather than particle diameter. We concluded that aerosols containing NaNO3 can be converted quantitatively by a molybdenum catalyst in the atmosphere. The confirmation of such quantitative reduction is the first-time.

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