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  4. Effect of Dissolved Organic Matter on the Transformation of Contaminants Induced by Excited Triplet States and the Hydroxyl Radical
 
research article

Effect of Dissolved Organic Matter on the Transformation of Contaminants Induced by Excited Triplet States and the Hydroxyl Radical

Wenk, Jannis
•
von Gunten, Urs  
•
Canonica, Silvio
2011
Environmental Science & Technology

Dissolved organic matter (DOM) has recently been shown to reduce the transformation rate of various aqueous organic contaminants submitted to oxidation by excited triplet states, apparently by inhibiting the transformation of oxidation intermediates. The main goals of the present study were to evaluate in more detail the effect of concentration and type of DOM on the triplet-induced transformation rate of four selected organic compounds and to check for an analogous inhibition effect in the case of oxidation induced by hydroxyl radical. A marked inhibition by DOM of triplet-induced oxidation was observed for N,N-dirnethylaniline (DMA) and the two antibiotics sulfamethoxazole (SMX) and trimethoprim (TRI), with DOM of terrestrial origin being a more effective inhibitor than DOM of aquatic origin. The results are important to understand the role of D OM both as a photosensitizer and as an inhibitor for the triplet-induced transformation of aquatic contaminants. In contrast, no DOM-induced reduction in second-order rate constant could be observed in competition kinetics experiments for the reaction of hydroxyl radical with a series of 15 organic compounds, covering several dasses of aromatic contaminants, indicating that Suwannee River fulvic acid (SRFA) used as reference DOM does not affect this reaction mechanism.

  • Details
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Type
research article
DOI
10.1021/es102212t
Web of Science ID

WOS:000287122400027

Author(s)
Wenk, Jannis
von Gunten, Urs  
Canonica, Silvio
Date Issued

2011

Published in
Environmental Science & Technology
Volume

45

Start page

1334

End page

1340

Subjects

Induced Oxidation

•

Drinking-Water

•

Natural-Waters

•

Rate Constants

•

Ozonation

•

Kinetics

•

Oh

•

Phototransformation

•

Photodegradation

•

Pharmaceuticals

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTQE  
Available on Infoscience
July 1, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/69137
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