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Evidence for photochemical production ofreactive oxygen species in desert soils

Irene Margiolaki

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URIhttp://purl.tuc.gr/dl/dias/A15ECF34-6206-468A-9CF8-ED071667FC39-
Identifierhttps://doi.org/10.1038/ncomms8100-
Languageen-
Extent11 pagesel
TitleEvidence for photochemical production of reactive oxygen species in desert soilsen
CreatorIrene Margiolakien
CreatorGeorge E. Christidisen
CreatorEleni Koutsopoulouen
CreatorGaosen Zhangen
CreatorKonstantinos Panagiotidisen
CreatorDimitrios Zisimopoulosen
CreatorIoannis Papapostolouen
CreatorKonstantinos Grintzalisen
CreatorChristopher P. McKayen
CreatorHenry J. Sunen
CreatorChristos D. Georgiouen
PublisherMacmillanen
Content SummaryThe combination of intense solar radiation and soil desiccation creates a short circuit in the biogeochemical carbon cycle, where soils release significant amounts of CO2 and reactive nitrogen oxides by abiotic oxidation. Here we show that desert soils accumulate metal superoxides and peroxides at higher levels than non-desert soils. We also show the photogeneration of equimolar superoxide and hydroxyl radical in desiccated and aqueous soils, respectively, by a photo-induced electron transfer mechanism supported by their mineralogical composition. Reactivity of desert soils is further supported by the generation of hydroxyl radical via aqueous extracts in the dark. Our findings extend to desert soils the photogeneration of reactive oxygen species by certain mineral oxides and also explain previous studies on desert soil organic oxidant chemistry and microbiology. Similar processes driven by ultraviolet radiation may be operating in the surface soils on Mars.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-09-26-
Date of Publication2015-
Bibliographic CitationChristos D. Georgiou, Henry J. Sun, Christopher P. McKay, Konstantinos Grintzalis1, Ioannis Papapostolou,Dimitrios Zisimopoulos, Konstantinos Panagiotidis, Gaosen Zhang, Eleni Koutsopoulou, George E. Christidis & Irene Margiolaki "Evidence for photochemical production of reactive oxygen species in desert soils "Nature Communications (Impact Factor: 11.47). 05/2015; 6:7100en

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