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Heterogeneous studies of atmospheric...

Hoffman, Rachel Christine.

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Heterogeneous studies of atmospheric pollutants, nitric acid, nitrogen pentoxide, and hydroxide radicals, with sodium chloride, sodium nitrate, and synthetic sea salt using multiple analytical methods.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Heterogeneous studies of atmospheric pollutants, nitric acid, nitrogen pentoxide, and hydroxide radicals, with sodium chloride, sodium nitrate, and synthetic sea salt using multiple analytical methods./
作者:	Hoffman, Rachel Christine.
面頁冊數:	187 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5542.
Contained By:	Dissertation Abstracts International64-11B.
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112939

Heterogeneous studies of atmospheric pollutants, nitric acid, nitrogen pentoxide, and hydroxide radicals, with sodium chloride, sodium nitrate, and synthetic sea salt using multiple analytical methods.
Hoffman, Rachel Christine.

Heterogeneous studies of atmospheric pollutants, nitric acid, nitrogen pentoxide, and hydroxide radicals, with sodium chloride, sodium nitrate, and synthetic sea salt using multiple analytical methods. - 187 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5542.

Thesis (Ph.D.)--University of California, Irvine, 2004.

Heterogeneous reactions involving sea salt aerosols and oxides of nitrogen are a potential source of photolyzable halogen compounds in the marine boundary layer. Specifically, the reactions of HNO3 and N2O 5 with NaCl, the major component in sea salt aerosols, results in production of gas phase HCl and ClNO2 leaving NaNO3 remaining within on particles. Experiments were conducted to elucidate a number of issues: (1) the reaction probability of each of the gases with NaCl; (2) the phase of NaNO3 aerosols and mixed aerosols of NaNO3 and NaCl under low relative humidity conditions; and (3) the extent to which the presence of nitrate affects the reactivity of chloride ions toward OH radicals. A number of analytical techniques were utilized including a Knudsen cell coupled to a quadrupole mass spectrometer, scanning electron microscopy with energy dispersive analysis of X-rays, and long path Fourier transform infrared spectroscopy.Subjects--Topical Terms:

560527
Chemistry, Physical.

Heterogeneous studies of atmospheric pollutants, nitric acid, nitrogen pentoxide, and hydroxide radicals, with sodium chloride, sodium nitrate, and synthetic sea salt using multiple analytical methods.
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245 1 0 $a Heterogeneous studies of atmospheric pollutants, nitric acid, nitrogen pentoxide, and hydroxide radicals, with sodium chloride, sodium nitrate, and synthetic sea salt using multiple analytical methods.
300 $a 187 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5542.
500 $a Chair: Barbara J. Finlayson-Pitts.
502 $a Thesis (Ph.D.)--University of California, Irvine, 2004.
520 $a Heterogeneous reactions involving sea salt aerosols and oxides of nitrogen are a potential source of photolyzable halogen compounds in the marine boundary layer. Specifically, the reactions of HNO3 and N2O 5 with NaCl, the major component in sea salt aerosols, results in production of gas phase HCl and ClNO2 leaving NaNO3 remaining within on particles. Experiments were conducted to elucidate a number of issues: (1) the reaction probability of each of the gases with NaCl; (2) the phase of NaNO3 aerosols and mixed aerosols of NaNO3 and NaCl under low relative humidity conditions; and (3) the extent to which the presence of nitrate affects the reactivity of chloride ions toward OH radicals. A number of analytical techniques were utilized including a Knudsen cell coupled to a quadrupole mass spectrometer, scanning electron microscopy with energy dispersive analysis of X-rays, and long path Fourier transform infrared spectroscopy.
520 $a Knudsen cell studies were conducted using less than one layer of salt particles and a new model was applied to account for the true available salt surface area. Reaction probabilities were determined to be (1.0 +/- 0.8) x 10-3 and (2.9 +/- 1.7) x 10 -3 for HNO3 and N2O5, respectively. Additionally, new models are proposed for each reaction involving water adsorbed on the salt surface. The data suggest that the reaction of HNO3 with effluoresced sea salt particles is less important than previously thought relative to reactions with N2O5 and ClONO2, which generate chlorine atom precursors, leaving nitrate remaining on the particles.
520 $a Hydration and dehydration studies of NaNO3 particles indicate that they exist as unusual metastable, amorphous solids at low relative humidities, and undergo continuous hygroscopic growth with increasing relative humidity. Mixed aerosol particles of NaCl and NaNO3 are shown to be comprised of a core of NaCl surrounded by a mixed layer of nitrate and chloride. Additionally, the presence of nitrate in these particles is found to actually enhance the depletion of chloride upon reaction with OH radicals, compared to reaction with NaCl particles alone.
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