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@article{1335111, author = {Zhang, Ning and Schindelka, Janine and Herrmann, Hartmut and George, Christian and Rosell, Monica and HerreroandMartin, Sara and Klán, Petr and Richnow, HansandHermann}, article_number = {1}, doi = {http://dx.doi.org/10.1021/es502791f}, keywords = {photochemistry; isotopes; photosensitization; humic substrances}, language = {eng}, issn = {0013-936X}, journal = {Environmental Science and Technology}, title = {Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation}, url = {http://pubs.acs.org/doi/abs/10.1021/es502791f}, volume = {49}, year = {2015} }
TY - JOUR ID - 1335111 AU - Zhang, Ning - Schindelka, Janine - Herrmann, Hartmut - George, Christian - Rosell, Monica - Herrero-Martin, Sara - Klán, Petr - Richnow, Hans-Hermann PY - 2015 TI - Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation JF - Environmental Science and Technology VL - 49 IS - 1 SP - 233-242 EP - 233-242 SN - 0013936X KW - photochemistry KW - isotopes KW - photosensitization KW - humic substrances UR - http://pubs.acs.org/doi/abs/10.1021/es502791f N2 - Humic substances (HS) acting as photosensitizers can generate a variety of reactive species, such as OH radicals and excited triplet states ((HS)-H-3*), 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, Delta (Delta delta H-2/Delta delta C-13) 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 (Delta = 24 +/- 2). However, (3)HS* may become a predominant reactive species upon the quenching of OH radicals (Delta = 14 +/- 1), and this process can also play a key role in the degradation of ETBE by PPHA photosensitization in deoxygenated media (Delta = 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 (Delta = 14 +/- 1). Our results demonstrate that the use of CSIA could open new avenues for the assessment of photosensitization pathways. ER -
ZHANG, Ning, Janine SCHINDELKA, Hartmut HERRMANN, Christian GEORGE, Monica ROSELL, Sara HERRERO-MARTIN, Petr KLÁN a Hans-Hermann RICHNOW. Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation. \textit{Environmental Science and Technology}. 2015, roč.~49, č.~1, s.~233-242. ISSN~0013-936X. Dostupné z: https://dx.doi.org/10.1021/es502791f.
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