下から上への接点における有機物の異常な酸化と大気への影響
Federico Karagulian1, Christopher W Dilbeck, Barbara J Finlayson-Pitts
1Department of Chemistry, University of California Irvine, Irvine, California 92697-2025, USA.
Journal of the American Chemical Society
|August 6, 2008
まとめ
OPPCによるナトリウムニトリートと塩化ナトリウムの光解は,脂質の酸化を引き起こした. この"下から上へ"の酸化は,窒素酸塩の光化学で生成されたヒドロキシルフリーラジカルから生じ,下層大気化学に影響を与えました.
科学分野:
- 大気化学 大気化学
- フォトケミストリーは,写真化学です.
- 表面科学とは,地表科学である.
背景:
- 大気中のエアロゾールはOPPCのような脂質を含んでいる.
- ナイトライト光化学は,反応性種の既知の源である.
- エアロゾールと表面の相互作用を理解することは,大気モデリングに不可欠です.
研究 の 目的:
- OPPCの光化学的酸化を調査する.
- OPPCの酸化に起因する反応性種を特定する.
- 観測された化学の大気関連性を評価する.
主な方法:
- 吸収されたOPPCとNaNO2/NaCl混合物の光分解.
- 酸化製品の分析.
- ラジカル生成と反応のメカニズム的調査.
主要な成果:
- 光分解によりOPPCの有意な酸化が誘発された.
- 主要な酸化物質として,ヒドロキシル (OH) フリーラジカルが特定されました.
- OPPCの二重結合にOHラジカルが加えられ, "bottom-up"酸化が開始される.
結論:
- 水の存在下でのナイトライト光化学は,エアロゾールの表面上の脂質を酸化することができます.
- このメカニズムは,有機エアロゾールの"ボトムアップ"酸化に寄与する.
- この発見は,下層大気圏の化学的進化に関連しています.
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