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

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...

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Veröffentlicht in:Water (Basel) 2021-06, Vol.13 (12), p.1703
Hauptverfasser: Wilske, Christin, Herzsprung, Peter, Lechtenfeld, Oliver J., Kamjunke, Norbert, Einax, Jürgen W., von Tümpling, Wolf
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container_issue 12
container_start_page 1703
container_title Water (Basel)
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creator Wilske, Christin
Herzsprung, Peter
Lechtenfeld, Oliver J.
Kamjunke, Norbert
Einax, Jürgen W.
von Tümpling, Wolf
description 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.
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subjects Coagulants
Correlation
Cyclotron resonance
Decomposition
Disinfection
Dissolved organic matter
Drinking water
Emission analysis
Factor analysis
Flocculation
Fluorescence
Investigations
Laboratories
Mass spectrometry
Mass spectroscopy
Photochemicals
Quality assessment
Quality control
Raw water
Reservoirs
Seasonal variations
Standing waters
Water quality
title New Insights into the Seasonal Variation of DOM Quality of a Humic-Rich Drinking-Water Reservoir—Coupling 2D-Fluorescence and FTICR MS Measurements
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