S(IV) Autoxidation in Atmospheric Liquid Water: The Role of Fe(II) and the Effect of Oxalate
作者： Irena Grgićc , Marjeta Pozničc , Mirko Bizjak
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摘要: The reactivity of dissolved iron compounds towards different pollutants and photooxidants in atmospheric liquid water depends upon the oxidation state speciation iron. Our measurements eluted from aerosol particles (Dae: 0.4–1.6 μm) collected urban atmosphere Ljubljana showed that a large fraction content is present as Fe(II). concentration ratio [Fe(II)]/[Fe(III)] varied between 0.9 3.1. kinetics S(IV) autoxidation catalyzed by Fe(II) under conditions representative for acidified influence oxalate on this reaction dark was investigated. rate same if or Fe(III) used catalyst condition can be oxidized Fe(III), which catalytically active species. Oxalate has strong inhibiting effect presence autocatalytic with an induction period, increases higher concentrations oxalate. differs according to whether initially state. However, both cases inhibition result formation complexes catalyst.
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