Facilitated heterogeneous photodegradation of dissolved organic matter by particulate iron

Julia Howitt, Darren Baldwin, Gavin Rees, Barry Hart

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The photochemical degradation of dissolved organic matter (DOM) derived from the leaves of River Red Gum (Eucalyptus camaldulensis) was examined, with a particular focus on the photochemical generation of CO2, consumption of O2, and the effect of particulate iron minerals on these photochemical reactions. Solutions of leaf leachate were irradiated with ultraviolet and visible light in the presence and absence of amorphous iron oxides. Addition of fresh iron oxide was found to increase the rate of photodegradation of the organic matter by up to an order of magnitude compared to the reactions without added iron oxide. The ratio of CO2 produced to O2 consumed was ~1:1 in both the presence and absence of iron oxyhydroxide. The reactivity of the iron oxides was dependent on the preparation method and decreased with increased storage time. These results suggest that photochemical reactions on particle surfaces should be considered when examining carbon transformation in aquatic ecosystems, especially at sites with potential for the production of iron oxyhydroxides.
Original languageEnglish
Pages (from-to)197-205
Number of pages9
JournalEnvironmental Chemistry
Volume1
Issue number3
DOIs
Publication statusPublished - 2004

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