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- W2328481226 abstract "Humic substances (HS) acting as photosensitizers can generate a variety of reactive species, such as OH radicals and excited triplet states (3HS*), promoting the degradation of organic compounds. Here, we apply compound-specific stable isotope analysis (CSIA) to characterize photosensitized mechanisms employing fuel oxygenates, such as methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE), as probes. In oxygenated aqueous media, Λ (Δδ2H/Δδ13C) values of 23 ± 3 and 21 ± 3 for ETBE obtained by photosensitization by Pahokee Peat Humic Acid (PPHA) and Suwannee River Fulvic Acid (SRFA), respectively, were in the range typical for H-abstraction by OH radicals generated by photolysis of H2O2 (Λ = 24 ± 2). However, 3HS* may become a predominant reactive species upon the quenching of OH radicals (Λ = 14 ± 1), and this process can also play a key role in the degradation of ETBE by PPHA photosensitization in deoxygenated media (Λ = 11 ± 1). This is in agreement with a model photosensitization by rose bengal (RB2–) in deoxygenated aqueous solutions resulting in one-electron oxidation of ETBE (Λ = 14 ± 1). Our results demonstrate that the use of CSIA could open new avenues for the assessment of photosensitization pathways." @default.
- W2328481226 created "2016-06-24" @default.
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- W2328481226 date "2014-12-17" @default.
- W2328481226 modified "2023-10-14" @default.
- W2328481226 title "Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation" @default.
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- W2328481226 doi "https://doi.org/10.1021/es502791f" @default.
- W2328481226 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25427194" @default.
- W2328481226 hasPublicationYear "2014" @default.
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