Direct Measurement of Organic Micropollutants in Water and Wastewater Using Fluorescence Spectroscopy

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  • Lesly Paradina-Fernández
  • Urban Wünsch
  • Bro, Rasmus
  • Kathleen Murphy

Quantifying organic micropollutants (OMPs) in aquatic environments and assessing their removal by water treatment requires expensive and time-consuming analyses typically using liquid chromatographic separation and tandem mass spectrometry (LC-MS/MS). In this study, we evaluated the potential for detecting fluorescent OMPs via spectroscopy, which is cheap, rapid, and widely accessible. The method involved using a priori PARAFAC models to eliminate interfering background fluorescence emitted by naturally occurring dissolved organic matter. Of 20 screened pharmaceutical OMPs, three (ciprofloxacin, naproxen, and zolpidem) with calculated fluorescence quantum yields 0.14, 0.21, and 0.71, respectively, could be quantified in the low μg L-1 range when added alone or in combination to water samples without any sample pretreatment other than filtration and pH adjustment. Limits of detection for all three OMPs were 1.0-3.3 μg L-1 in surface waters, while in wastewater, they were 0.6-9.0 μg L-1 for ciprofloxacin and naproxen and 1.0-2.6 μg L-1 for zolpidem. Given the high cost of pharmaceutical analyses and widespread availability of fluorometers, the new approach will improve access to rapid and cost-effective results by supporting data-intensive lab-scale studies, wherein the types of OMPs studied and their concentration ranges are under the control of the analyst.

OriginalsprogEngelsk
TidsskriftACS ES and T Water
Vol/bind3
Udgave nummer12
Sider (fra-til)3905-3915
DOI
StatusUdgivet - 2023

Bibliografisk note

Funding Information:
L.P.F. acknowledges support from Carl Tryggers Stiftelse (Project 19:246). The authors thank Maria Neth, Ville Tanskanen, and collaborating water treatment plants for supplying samples and data.

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.

ID: 380159728