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Article

New Insights into the Seasonal Variation of DOM Quality of a Humic-Rich Drinking-Water Reservoir—Coupling 2D-Fluorescence and FTICR MS Measurements

1
Central Laboratory for Water Analytics and Chemometrics, Helmholtz Centre for Environmental Research—UFZ, Brückstraße 3a, 39114 Magdeburg, Germany
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Department of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Lessingstraße 8, 07743 Jena, Germany
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Department of Lake Research, Helmholtz Centre for Environmental Research—UFZ, Brückstraße 3a, 39114 Magdeburg, Germany
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Department of Analytical Chemistry and ProVIS Centre for Chemical Microscopy, Research Group BioGeoOmics, Helmholtz Centre for Environmental Research—UFZ, Permoserstr. 15, 04318 Leipzig, Germany
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Department of River Ecology, Helmholtz Centre for Environmental Research–UFZ, Brückstraße 3a, 39114 Magdeburg, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Rolf D. Vogt and Hong Yang
Water 2021, 13(12), 1703; https://doi.org/10.3390/w13121703
Received: 31 March 2021 / Revised: 9 June 2021 / Accepted: 16 June 2021 / Published: 19 June 2021
Long-term changes in dissolved organic matter (DOM) quality, especially in humic-rich raw waters, may lead to intensive adaptions in drinking-water processing. However, seasonal DOM quality changes in standing waters are poorly understood. To fill this gap, the DOM quality of a German drinking water reservoir was investigated on a monthly basis by Fourier-transform ion cyclotron resonance mass spectrometry (FTICR MS) measurements and 2D fluorescence for 18 months. FTICR MS results showed seasonal changes of molecular formula (MF) intensities, indicating photochemical transformation of DOM as a significant process for DOM quality variation. For an assessment of the two humic-like components, identified by parallel factor analysis (PARAFAC) of excitation–emission matrices (EEM), their loadings were Spearman’s rank-correlated with the intensities of the FTICR MS-derived MF. One of the two PARAFAC components correlated to oxygen-rich and relatively unsaturated MF identified as easily photo-degradable, also known as coagulants in flocculation processes. The other PARAFAC component showed opposite seasonal fluctuations and correlated with more saturated MF identified as photo-products with some of them being potential precursors of disinfection byproducts. Our study indicated the importance of elucidating both the chemical background and seasonal behavior of DOM if raw water-quality control is implemented by bulk optical parameters. View Full-Text
Keywords: DOM; humic substances; 2D fluorescence; FTICR MS; PARAFAC; EEM DOM; humic substances; 2D fluorescence; FTICR MS; PARAFAC; EEM
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MDPI and ACS Style

Wilske, C.; Herzsprung, P.; Lechtenfeld, O.J.; Kamjunke, N.; Einax, J.W.; von Tümpling, W. New Insights into the Seasonal Variation of DOM Quality of a Humic-Rich Drinking-Water Reservoir—Coupling 2D-Fluorescence and FTICR MS Measurements. Water 2021, 13, 1703. https://doi.org/10.3390/w13121703

AMA Style

Wilske C, Herzsprung P, Lechtenfeld OJ, Kamjunke N, Einax JW, von Tümpling W. New Insights into the Seasonal Variation of DOM Quality of a Humic-Rich Drinking-Water Reservoir—Coupling 2D-Fluorescence and FTICR MS Measurements. Water. 2021; 13(12):1703. https://doi.org/10.3390/w13121703

Chicago/Turabian Style

Wilske, Christin, Peter Herzsprung, Oliver J. Lechtenfeld, Norbert Kamjunke, Jürgen W. Einax, and Wolf von Tümpling. 2021. "New Insights into the Seasonal Variation of DOM Quality of a Humic-Rich Drinking-Water Reservoir—Coupling 2D-Fluorescence and FTICR MS Measurements" Water 13, no. 12: 1703. https://doi.org/10.3390/w13121703

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