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Environments 2018, 5(1), 18; https://doi.org/10.3390/environments5010018

Electrochemistry-High Resolution Mass Spectrometry to Study Oxidation Products of Trimethoprim

1
Department of Chemistry, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
2
Department of Chemical Engineering, McGill University, Montreal, QC H3A 2B2, Canada
*
Author to whom correspondence should be addressed.
Received: 26 November 2017 / Revised: 18 January 2018 / Accepted: 19 January 2018 / Published: 24 January 2018
(This article belongs to the Special Issue Advances in Environmental Engineering)
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Abstract

The study of the fate of emerging organic contaminants (EOCs), especially the identification of transformation products, after water treatment or in the aquatic environment, is a topic of growing interest. In recent years, electrochemistry coupled to mass spectrometry has attracted a lot of attention as an alternative technique to investigate oxidation metabolites of organic compounds. The present study used different electrochemical approaches, such as cyclic voltammetry, electrolysis, electro-assisted Fenton reaction coupled offline to high resolution mass spectrometry and thin-layer flow cell coupled online to high resolution mass spectrometry, to study oxidation products of the anti-infective trimethoprim, a contaminant of emerging concern frequently reported in wastewaters and surface waters. Results showed that mono- and di-hydroxylated derivatives of trimethoprim were generated in electrochemically and possibly tri-hydroxylated derivatives as well. Those compounds have been previously reported as mammalian and bacterial metabolites as well as transformation products of advance oxidation processes applied to waters containing trimethoprim. Therefore, this study confirmed that electrochemical techniques are relevant not only to mimic specific biotransformation reactions of organic contaminants, as it has been suggested previously, but also to study the oxidation reactions of organic contaminants of interest in water treatment. The key role that redox reactions play in the environment make electrochemistry-high resolution mass spectrometry a sensitive and simple technique to improve our understanding of the fate of organic contaminants in the environment. View Full-Text
Keywords: redox reactions; EC-MS; Fenton reaction; fate of contaminants of emerging concern; transformation products redox reactions; EC-MS; Fenton reaction; fate of contaminants of emerging concern; transformation products
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Lecours, M.-A.; Eysseric, E.; Yargeau, V.; Lessard, J.; Brisard, G.M.; Segura, P.A. Electrochemistry-High Resolution Mass Spectrometry to Study Oxidation Products of Trimethoprim. Environments 2018, 5, 18.

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