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Changes in Dissolved Organic Matter during the Treatment Processes of a Drinking Water Plant in Sweden and Formation of Previously Unknown Disinfection Byproducts
University of Maryland, MD 20688 USA.
Helmholtz Zentrum Munchen, Germany; Technical University of Munich, Germany.
Tekniska Verken Linkoping AB, S-58115 Linkoping, Sweden.
University of S Carolina, SC 29208 USA.
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2014 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 48, no 21, 12714-12722 p.Article in journal (Refereed) Published
Abstract [en]

The changes in dissolved organic matter (DOM) throughout the treatment processes in a drinking water treatment plant in Sweden and the formation of disinfection byproducts (DBPs) were evaluated by using ultra-high-resolution mass spectrometry (resolution of similar to 500000 at m/z 400) and nuclear magnetic resonance (NMR). Mass spectrometric results revealed that flocculation induced substantial changes in the DOM and caused quantitative removal of DOM constituents that usually are associated with DBP formation While half of the chromophoric DOM (CDOM) was removed by flocculation, similar to 4-5 mg L-1 total organic carbon remained in the finished water. A conservative approach revealed the formation of similar to 800 mass spectrometry ions with unambiguous molecular formula assignments that contained at least one halogen atom. These molecules likely represented new DBPs, which could not be prevented by the flocculation process. The most abundant m/z peaks, associated with formed DBPs, could be assigned to C5HO3Cl3, C5HO3Cl2Br, C5HO3ClBr2 using isotope simulation patterns. Other halogen-containing formulas suggested the presence of halogenated polyphenolic and aromatic acid-type structures, which was supported by possible structures that matched the lower molecular mass range (maximum of 10 carbon atoms) of these DBPs. H-1 NMR before and after disinfection revealed an similar to 2% change in the overall H-1 NMR signals supporting a significant change in the DOM caused by disinfection. This study underlines the fact that a large and increasing number of people are exposed to a very diverse pool of organohalogens through water by both drinking and uptake through the skin upon contact. Nontarget analytical approaches are indispensable for revealing the magnitude of this exposure and to test alternative ways to reduce it.

Place, publisher, year, edition, pages
American Chemical Society , 2014. Vol. 48, no 21, 12714-12722 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:liu:diva-112812DOI: 10.1021/es504349pISI: 000344449100029PubMedID: 25322143OAI: diva2:777144
Available from: 2015-01-08 Created: 2014-12-17 Last updated: 2015-01-08

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Bastviken, David
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Department of Water and Environmental StudiesFaculty of Arts and Sciences
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