trop - Tropospheric chemistry Paradigms: 1. earth's...

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1 Tropospheric chemistry Paradigms: 1. earth's atmosphere is oxidizing 2. trace gases released into the atmosphere are eventually oxidized by oxygen (lose electrons to O 2 ) 3. the oxidation of primary pollutants produces secondary pollutants 4. oxidized chemicals are water soluble and are removed from the atmosphere by rain 5. oxidation reactions in the troposphere are initiated by OH· Key reactions in the oxidation of tropospheric gases A. Reaction with OH· source of OH· in clean troposphere: UV-B O 3 –––––––> O 2 + O* O * + H 2 O –––––––> 2OH· 1. addition to molecules with multiple bonds: 2. H abstraction from reduced compounds: B. Photochemical reactions UV-A 1. NO 2 · –––––> NO· + O UV, VIS . 2. RHCO –––––––––> R· + HCO (aldehyde)
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2 C. Reactions of radicals with O 2 to form peroxy radicals 1. addition to alkyl radicals or H: 2. H abstraction from alk-oxy radicals: D. Reaction of peroxy radicals with (and oxidation of) nitric oxide (NO·)
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trop - Tropospheric chemistry Paradigms: 1. earth's...

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