Evidence for 13-carbon enrichment in oxalic acid via iron catalyzed photolysis in aqueous phase

Details Evidence for 13-carbon enrichment in oxalic acid via iron catalyzed photolysis in aqueous phase Evidence for 13-carbon enrichment in oxalic acid via iron catalyzed photolysis in aqueous phase

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3903802p&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 3, CiteID L03802

Physics

1

Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Biogeosciences: Oxidation/Reduction Reactions (4851)

Scientific paper

To investigate the effect of photochemical aging on the stable carbon isotopic ratio (δ13C) of oxalic acid (OxA), a dominant organic species in atmospheric aerosols, we conducted a laboratory photolysis of OxA under H2O2-Fe3+(Fe2+)-UV system in aqueous phase and measured δ13C of remaining OxA. Our results showed that a significant photolysis of OxA occurred with OH radical but the isotopic fractionation of OxA was insignificant. In contrast, in the presence of Fe3+ (Fe2+), we found a significant enrichment of 13C in remaining OxA. We also found that kinetic isotope effect (KIE) of OxA largely depends on photochemical age (irradiation time) and concentration ratios of OxA to iron; 3.20 ± 0.49‰ (2.18 ± 1.18‰) and 21.62 ± 5.41‰ in 90 min and 180 min irradiation, in which OxA and Fe3+ (Fe2+) ratios were 50:1 and 200:1, respectively. The enrichment of 13C in remaining OxA was more significant during the photolysis catalyzed by Fe3+ (7‰) than by Fe2+ (3‰) in 90 min irradiation when OxA and iron ratios are the same (50:1). This study provides a laboratory evidence for the isotopic enrichment of 13C in OxA with photochemical aging. This approach is useful for better interpretation of atmospheric isotopic measurements in terms of the extent of atmospheric processing of aerosols.

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