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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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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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.</description><identifier>ISSN: 2073-4441</identifier><identifier>EISSN: 2073-4441</identifier><identifier>DOI: 10.3390/w13121703</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>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</subject><ispartof>Water (Basel), 2021-06, Vol.13 (12), p.1703</ispartof><rights>COPYRIGHT 2021 MDPI AG</rights><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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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.</description><subject>Coagulants</subject><subject>Correlation</subject><subject>Cyclotron resonance</subject><subject>Decomposition</subject><subject>Disinfection</subject><subject>Dissolved organic matter</subject><subject>Drinking water</subject><subject>Emission analysis</subject><subject>Factor analysis</subject><subject>Flocculation</subject><subject>Fluorescence</subject><subject>Investigations</subject><subject>Laboratories</subject><subject>Mass spectrometry</subject><subject>Mass spectroscopy</subject><subject>Photochemicals</subject><subject>Quality assessment</subject><subject>Quality control</subject><subject>Raw water</subject><subject>Reservoirs</subject><subject>Seasonal variations</subject><subject>Standing waters</subject><subject>Water quality</subject><issn>2073-4441</issn><issn>2073-4441</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpNUc1O4zAQjtAigYADb2CJE4eA7YmT-ohaulSiIEoFx8hxJ60htbu2s4gbD8G-4D4JRkWImcP8_3z6suyY0TMASc9fGDDOKgo72T6nFeRFUbBfP_y97CiEJ5qkkIOBoPvZvxt8IRMbzHIVAzE2OhJXSO5RBWdVRx6UNyoaZ4lryeh2Su561Zn4-hkqctWvjc5nRq_IyBv7bOwyf1QRPZlhQP_XGf__7X3o-k2XSoSP8nHXO49Bo9VIlF2Q8XwynJHpPZmmk73HNdoYDrPdVnUBj77sQTYfX86HV_n17e_J8OI61wAs5q2AsuRSFSBEwwWWZakaUICcSqFgIWXbgC5KwIY2gtGyqbhuOFINAiXAQXayXbvx7k-PIdZPrvcJdqi5KASTFR3I1HW27VqqDmtjWxe90kkXmNA7i61J-YtKsvQUl4M0cLod0N6F4LGtN96slX-tGa0_iaq_iYIPd2-FNg</recordid><startdate>20210601</startdate><enddate>20210601</enddate><creator>Wilske, Christin</creator><creator>Herzsprung, Peter</creator><creator>Lechtenfeld, Oliver J.</creator><creator>Kamjunke, Norbert</creator><creator>Einax, Jürgen W.</creator><creator>von Tümpling, Wolf</creator><general>MDPI AG</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><orcidid>https://orcid.org/0000-0001-7928-7582</orcidid><orcidid>https://orcid.org/0000-0001-5872-443X</orcidid><orcidid>https://orcid.org/0000-0002-8016-5352</orcidid><orcidid>https://orcid.org/0000-0001-5313-6014</orcidid></search><sort><creationdate>20210601</creationdate><title>New Insights into the Seasonal Variation of DOM Quality of a Humic-Rich Drinking-Water Reservoir—Coupling 2D-Fluorescence and FTICR MS Measurements</title><author>Wilske, Christin ; 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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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