4.8 Article

A New Mechanism of Acid Rain Generation from HOSO at the Air-Water Interface

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 42, Pages 16564-16568

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b07912

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Funding

  1. French CINES [1ct2550]
  2. Generalitat de Catalunya [2017SGR348]

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The photochemistry of SO2 at the air-water interface of water droplets leads to the formation of HOSO radicals. Using first-principles simulations, we show that HOSO displays an unforeseen strong acidity (pK(a) = -1) comparable with that of nitric acid and is fully dissociated at the air-water interface. Accordingly, this radical might play an important role in acid rain formation. Potential implications are discussed.

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