Photosensitized reduction of nitrogen dioxide on humic acid as a source of nitrous acid

Konrad Stemmler (), Markus Ammann, Chantal Donders, Jörg Kleffmann and Christian George
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Konrad Stemmler: Laboratory of Radio- and Environmental Chemistry
Markus Ammann: Laboratory of Radio- and Environmental Chemistry
Chantal Donders: Laboratory of Radio- and Environmental Chemistry
Jörg Kleffmann: Bergische Universität Wuppertal, Physikalische Chemie/FB C
Christian George: Laboratoire d'Application de la Chimie à l'Environnement (UCBL-CNRS)

Nature, 2006, vol. 440, issue 7081, 195-198

Abstract: Nitrous acid: the day job Nitrous acid is a major photochemical precursor of the hydroxyl radical, a key oxidant in the degradation of air pollutants in the lower atmosphere. The gas is known to accumulate in the lower troposphere at night, but the recent discovery of enhanced concentrations of nitrous acid measured at various sites both urban and rural during daytime was a surprise. Now the light-induced reaction between soil humic acid and nitrogen dioxide has been put forward as an explanation. The observed reaction rate of nitrous acid formation suggests that this production mechanism could be an important factor in the chemistry of the lower troposphere

Date: 2006
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DOI: 10.1038/nature04603

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