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Enhanced nitrate ion photolysis in t...

Richards, Nicole K.

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Enhanced nitrate ion photolysis in the presence of bromide.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Enhanced nitrate ion photolysis in the presence of bromide./
作者:	Richards, Nicole K.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2010,
面頁冊數:	63 p.
附註:	Source: Masters Abstracts International, Volume: 72-05.
Contained By:	Masters Abstracts International72-05.
標題:	Atmospheric Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1482717
ISBN:	9781124295152

Enhanced nitrate ion photolysis in the presence of bromide.
Richards, Nicole K.

Enhanced nitrate ion photolysis in the presence of bromide. - Ann Arbor : ProQuest Dissertations & Theses, 2010 - 63 p.

Source: Masters Abstracts International, Volume: 72-05.

Thesis (M.S.)--University of California, Irvine, 2010.

This item must not be added to any third party search indexes.

Nitrate ion photochemistry is an important source of NO x in the atmosphere. It is uncertain whether ions such as halides play a role in nitrate photochemistry. The effect of Br- on NO 3- photolysis was investigated using photolysis experiments in 230 L Teflon chambers that contain deliquesced aerosols consisting of NaNO3 and NaBr. Gas phase NO2 and gaseous bromine products were measured as a function of photolysis time using long path FTIR and API-MS. The systems explored include pure NaNO3 and mixtures of NaBr and NaNO 3 at a constant total molarity of 4 M. In addition, photolysis of NaBr and NaNO3 mixtures were conducted with NO3- held at a constant 0.5 M and varying the amount of NaBr from 0.25 M to 4 M. As the Br- to NO3- ratio increases, there is an enhancement in the rate of production of NO2 in the nitrate-bromide mixtures over that formed in the photolysis of NaNO3 . Molecular bromine measurements by API-MS show that gaseous bromine is also formed during photolysis. This formation follows the same trend as NO2 formation, with increased yield as the ratio of NaBr:NaNO 3 increases. The observation of Br2 in these experiments suggests that nitrate photochemistry on snowpack containing halides from sea salt could be an important source of Br2 in the Arctic and at mid-latitudes. Molecular Dynamic (MD) simulations provided by the Tobias group show that as the ratio of Br-:NO3- increases, the nitrate ions are brought up closer to the interface into a region where there is a reduced solvent cage. The implications of this photochemistry are discussed and future directions are given.

ISBN: 9781124295152Subjects--Topical Terms:

1669583
Atmospheric Chemistry.

Enhanced nitrate ion photolysis in the presence of bromide.
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506 $a This item must not be sold to any third party vendors.
520 $a Nitrate ion photochemistry is an important source of NO x in the atmosphere. It is uncertain whether ions such as halides play a role in nitrate photochemistry. The effect of Br- on NO 3- photolysis was investigated using photolysis experiments in 230 L Teflon chambers that contain deliquesced aerosols consisting of NaNO3 and NaBr. Gas phase NO2 and gaseous bromine products were measured as a function of photolysis time using long path FTIR and API-MS. The systems explored include pure NaNO3 and mixtures of NaBr and NaNO 3 at a constant total molarity of 4 M. In addition, photolysis of NaBr and NaNO3 mixtures were conducted with NO3- held at a constant 0.5 M and varying the amount of NaBr from 0.25 M to 4 M. As the Br- to NO3- ratio increases, there is an enhancement in the rate of production of NO2 in the nitrate-bromide mixtures over that formed in the photolysis of NaNO3 . Molecular bromine measurements by API-MS show that gaseous bromine is also formed during photolysis. This formation follows the same trend as NO2 formation, with increased yield as the ratio of NaBr:NaNO 3 increases. The observation of Br2 in these experiments suggests that nitrate photochemistry on snowpack containing halides from sea salt could be an important source of Br2 in the Arctic and at mid-latitudes. Molecular Dynamic (MD) simulations provided by the Tobias group show that as the ratio of Br-:NO3- increases, the nitrate ions are brought up closer to the interface into a region where there is a reduced solvent cage. The implications of this photochemistry are discussed and future directions are given.
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