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How isotope effects influence indirect photochemistry involving antioxidants
- Conference Poster
Redox active organic matter fulfills dual roles in the indirect photochemical decay of aquatic pollutants because its sensitizing moieties enhance photodegradation and its antioxidant moieties decelerate degradation. We investigate the kinetic solvent isotope effect (KSIE) on the indirect photochemistry of NSAIDs. Thus far, the KSIE was evident of a reaction with 1O2, because its longer lifetime in D2O results in enhanced photodegradation. We demonstrate that photodegradation of NSAIDs in the presence of organic matter is also faster in D2O. The repair of pollutant radical intermediates by antioxidants is slower in D2O versus H2O, as quantified by transient absorption spectroscopy. Slower repair results in faster photodecay and verifies a KSIE beyond reactions with 1O2 Show more
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Organisational unit03850 - McNeill, Kristopher
156198 - Electron transfer properties of photoexcited natural organic matter (SNF)
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