Investigation of Humic Substance Photosensitized Reactions via
Carbon and Hydrogen Isotope Fractionation

J 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.

Basic information

Original name

Investigation of Humic Substance Photosensitized Reactions via Carbon and Hydrogen Isotope Fractionation

Authors

ZHANG, Ning; Janine SCHINDELKA; Hartmut HERRMANN; Christian GEORGE; Monica ROSELL; Sara HERRERO-MARTIN; Petr KLÁN and Hans-Hermann RICHNOW

Edition

Environmental Science and Technology, 2015, 0013-936X

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10401 Organic chemistry

Country of publisher

United States of America

Confidentiality degree

is not subject to a state or trade secret

References:

URL

Impact factor

Impact factor: 5.393

RIV identification code

RIV/00216224:14310/15:00086548

Organization unit

Faculty of Science

DOI

https://doi.org/10.1021/es502791f

UT WoS

000347589300026

EID Scopus

2-s2.0-84924960071

Keywords in English

photochemistry; isotopes; photosensitization; humic substrances

Abstract

In the original language

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.

Links

LO1214, research and development project

Name: Centrum pro výzkum toxických látek v prostředí (Acronym: RECETOX)

Investor: Ministry of Education, Youth and Sports of the CR

Cite

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. Environmental Science and Technology. 2015, vol. 49, No 1, p. 233-242. ISSN 0013-936X. Available from: https://doi.org/10.1021/es502791f.

@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 = {https://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://doi.org/10.1021/es502791f.

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