Oxidation of cetirizine, fexofenadine and hydrochlorothiazide during ozonation: Kinetics and formation of transformation products

WATER RESEARCH

卷:94

Article

Borowska, Ewa^1,2  Bourgin, Marc¹  Hollender, Juliane^1,3  Kienle, Cornelia⁴  McArdell, Christa S.¹  von Gunten, Urs^1,3,5 

[1] Eawag, Swiss Fed Inst Aquat Sci & Technol, CH-8600 Dubendorf, Switzerland

[2] Silesian Tech Univ, Fac Power & Environm Engn, Environm Biotechnol Dept, PL-44100 Gliwice, Poland

[3] Swiss Fed Inst Technol, Inst Biogeochem & Pollutant Dynam IBP, CH-8092 Zurich, Switzerland

[4] Swiss Ctr Appl Ecotoxicol Eawag EPFL, Uberlandstr 133, CH-8600 Dubendorf, Switzerland

[5] Ecole Polytech Fed Lausanne, Sch Architecture Civil & Environm Engn ENAC, CH-1015 Lausanne, Switzerland

关键词: Ozonation;    Second-order rate constant;    Kinetics;    Transformation products;    High-resolution mass spectrometry;   

DOI  :  10.1016/j.watres.2016.02.020

来源: Elsevier

【 摘 要 】

The efficiency of wastewater ozonation for the abatement of three nitrogen-containing pharmaceuticals, two antihistamine drugs, cetirizine (CTR) and fexofenadine (FXF), and the diuretic drug, hydrochlorothiazide (HCTZ), was investigated. Species-specific second-order rate constants for the reactions of the molecular, protonated (CTR, FXF) or deprotonated (HCTZ) forms of these compounds with ozone were determined. All three compounds are very reactive with ozone (apparent second order rate constants at pH 7: k(03,pH7) = 1.7.10(5) M(-1)s(-1), 8.5.10(4) M(-1)s(-1) and 9.0.10(3) M(-1)s(-1) for CTR, HCTZ and FXF, respectively). Transformation product (TP) structures were elucidated using liquid chromatography coupled with high resolution tandem mass spectrometry, including isotope-labeled standards. For cetirizine and hydrochlorothiazide 8 TPs each and for fexofenadine 7 TPs were identified. The main TPs of cetirizine and fexofenadine are their respective N-oxides, whereas chlorothiazide forms to almost 100% from hydrochlorothiazide. In the bacteria bioluminescence assay the toxicity was slightly increased only during the ozonation of cetirizine at very high cetirizine concentrations. The main TPs detected in bench-scale experiments were also detected in full-scale ozonation of a municipal wastewater, for >90% elimination of the parent compounds. (C) 2016 Elsevier Ltd. All rights reserved.

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