Selective Photochemical Oxidation of Reduced Dissolved Organic Sulfur to Inorganic Sulfate.

ABSTRACT: The chemical nature and stability of reduced dissolved organic sulfur (DOS_Red) have implications on the biogeochemical cycling of trace and major elements across fresh and marine aquatic environments, but the underlying processes governing DOS_Red stability remain obscure. Here, dissolved organic matter (DOM) was isolated from a sulfidic wetland, and laboratory experiments quantified dark and photochemical oxidation of DOS_Red using atomic-level measurement of sulfur X-ray absorption near-edge structure (XANES) spectroscopy. DOS_Red was completely resistant to oxidation by molecular oxygen in the dark and underwent rapid and quantitative oxidation to inorganic sulfate (SO₄^2-) in the presence of sunlight. The rate of DOS_Red

SUBMITTER: Poulin BA 

PROVIDER: S-EPMC10275504 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature