Effect of dissolved organic matter on the transformation of contaminants induced by excited triplet states and the hydroxyl radical

Jannis Wenk, Urs Von Gunten, Silvio Canonica

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Abstract

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-dimethylaniline (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 DOM 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 classes of aromatic contaminants, indicating that Suwannee River fulvic acid (SRFA) used as reference DOM does not affect this reaction mechanism.

Original languageEnglish
Pages (from-to)1334-1340
Number of pages7
JournalEnvironmental Science and Technology
Volume45
Issue number4
DOIs
Publication statusPublished - 15 Feb 2011

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hydroxyl radical
Excited states
dissolved organic matter
Hydroxyl Radical
Biological materials
Impurities
pollutant
oxidation
Oxidation
Organic compounds
inhibitor
organic compound
Photosensitizing Agents
effect
Sulfamethoxazole Drug Combination Trimethoprim
fulvic acid
antibiotics
Rate constants
Rivers
Anti-Bacterial Agents

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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.

In: Environmental Science and Technology, Vol. 45, No. 4, 15.02.2011, p. 1334-1340.

Research output: Contribution to journalArticle

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