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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 and Hans-Hermann RICHNOW. Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation. \textit{Environmental Science and Technology}. 2015, vol.~49, No~1, p.~233-242. ISSN~0013-936X. Available from: https://dx.doi.org/10.1021/es502791f.
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