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- W3209712178 endingPage "15122" @default.
- W3209712178 startingPage "15110" @default.
- W3209712178 abstract "Dissolved organic matter (DOM) has a dual role in indirect phototransformations of aquatic contaminants by acting both as a photosensitizer and an inhibitor. Herein, the pH dependence of the inhibitory effect of DOM and the underlying mechanisms were studied in more than 400 kinetic irradiation experiments over the pH range of 6-11. Experiments employed various combinations of one of three DOM isolates, one of two model photosensitizers, the model antioxidant phenol, and one of nine target compounds (TCs), comprising several aromatic amines, in particular anilines and sulfonamides, and 4-cyanophenol. Using model photosensitizers without antioxidants, the phototransformation of most TCs increased with increasing pH, even for TCs for which pH did not affect speciation. This trend was attributed to pH-dependent formation yields of TC-derived radicals and their re-formation to the parent TC. Analogous trends were observed with DOM as a photosensitizer. Comparison of model and DOM photosensitizer data sets showed increasing inhibitory effects of DOM on TC phototransformation kinetics with increasing pH. In systems with anilines as a TC and phenol as a model antioxidant, pH trends of the inhibitory effect could be rationalized based on the reduction potential difference (ΔEred) of phenoxyl/phenol and anilinyl/aniline couples. Our results indicate that the light-induced transformation of aromatic amines in the aquatic environment is governed by the pH-dependent inhibitory effects of antioxidant phenolic moieties of DOM and pH-dependent processes related to the formation of amine oxidation intermediates." @default.
- W3209712178 created "2021-11-08" @default.
- W3209712178 creator A5022337602 @default.
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- W3209712178 creator A5067285983 @default.
- W3209712178 creator A5073163291 @default.
- W3209712178 date "2021-10-29" @default.
- W3209712178 modified "2023-10-16" @default.
- W3209712178 title "Effect of Solution pH on the Dual Role of Dissolved Organic Matter in Sensitized Pollutant Photooxidation" @default.
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- W3209712178 doi "https://doi.org/10.1021/acs.est.1c03301" @default.
- W3209712178 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34714642" @default.