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Issue 6, 2020
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Photochemical fate of quaternary ammonium compounds in river water

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Abstract

Quaternary ammonium compounds (QACs) are not completely removed during wastewater treatment and are frequently detected in surface waters and sediments. The photochemical transformation of QACs has not been thoroughly investigated as a potential degradation pathway affecting their fate in the environment. Kinetic studies of common QACs with and without aromatic groups under simulated and natural sunlight conditions were performed with model sensitizers and dissolved organic matter to estimate photochemical half-lives in the aquatic environment. All QACs investigated react with hydroxyl radicals at diffusion-controlled rates (∼2.9 × 109 to 1.2 × 1010 M−1 s−1). Benzethonium reacted via direct photolysis (ΦBZT,outdoor = 1.7 × 10−2 (mol Ei−1)). Benzethonium also reacted with the triplet excited state model sensitizer 2-acetylnaphthalene, but evidence suggests this reaction pathway is unimportant in natural waters due to faster quenching of the triplet 2-acetylnapthalene by oxygen. Reactivity with singlet oxygen for the QACs was minimal. Overall, reactions with hydroxyl radicals will dominate over direct photolysis due to limited spectral overlap of sunlight emission and QAC absorbance. Photolysis half-lives are predicted to be 12 to 94 days, indicating slow abiotic degradation in surface water.

Graphical abstract: Photochemical fate of quaternary ammonium compounds in river water

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Supplementary files

Article information


Submitted
20 Feb 2020
Accepted
16 Apr 2020
First published
17 Apr 2020

This article is Open Access

Environ. Sci.: Processes Impacts, 2020,22, 1368-1381
Article type
Paper

Photochemical fate of quaternary ammonium compounds in river water

P. I. Hora and W. A. Arnold, Environ. Sci.: Processes Impacts, 2020, 22, 1368
DOI: 10.1039/D0EM00086H

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