2015
Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation
ZHANG, Ning, Janine SCHINDELKA, Hartmut HERRMANN, Christian GEORGE, Monica ROSELL et. al.Základní údaje
Originální název
Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation
Autoři
ZHANG, Ning (156 Čína), Janine SCHINDELKA (276 Německo), Hartmut HERRMANN (276 Německo), Christian GEORGE (250 Francie), Monica ROSELL (724 Španělsko), Sara HERRERO-MARTIN (276 Německo), Petr KLÁN (203 Česká republika, garant, domácí) a Hans-Hermann RICHNOW (276 Německo)
Vydání
Environmental Science and Technology, 2015, 0013-936X
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10401 Organic chemistry
Stát vydavatele
Spojené státy
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Impakt faktor
Impact factor: 5.393
Kód RIV
RIV/00216224:14310/15:00086548
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000347589300026
Klíčová slova anglicky
photochemistry; isotopes; photosensitization; humic substrances
Změněno: 11. 2. 2016 14:43, prof. RNDr. Petr Klán, Ph.D.
Anotace
V originále
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.
Návaznosti
LO1214, projekt VaV |
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