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

GND
1302216368
ORCID
0000-0001-7928-7582
Affiliation
Friedrich Schiller University Jena
Wilske, Christin;
ORCID
0000-0001-5872-443X
Affiliation
Department of Lake Research, Helmholtz Centre for Environmental Research—UFZ, Brückstraße 3a, 39114 Magdeburg, Germany, peter.herzsprung@ufz.de
Herzsprung, Peter;
ORCID
0000-0001-5313-6014
Affiliation
Department of Analytical Chemistry and ProVIS Centre for Chemical Microscopy, Research Group BioGeoOmics, Helmholtz Centre for Environmental Research—UFZ, Permoserstr. 15, 04318 Leipzig, Germany, oliver.lechtenfeld@ufz.de
Lechtenfeld, Oliver J.;
ORCID
0000-0002-8016-5352
Affiliation
Department of River Ecology, Helmholtz Centre for Environmental Research−UFZ, Brückstraße 3a, 39114 Magdeburg, Germany, norbert.kamjunke@ufz.de
Kamjunke, Norbert;
GND
1030500622
Affiliation
Department of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Lessingstraße 8, 07743 Jena, Germany, juergen.einax@uni-jena.de
Einax, Jürgen W.;
Affiliation
Central Laboratory for Water Analytics and Chemometrics, Helmholtz Centre for Environmental Research—UFZ, Brückstraße 3a, 39114 Magdeburg, Germany, wolf.vontuempling@ufz.de
von Tümpling, Wolf

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 oxygenrich 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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