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Dadi, T.* ; Harir, M. ; Hertkorn, N. ; Koschorreck, M.* ; Schmitt-Kopplin, P. ; Herzsprung, P.*

Redox conditions affect dissolved organic carbon quality in stratified freshwaters.

Environ. Sci. Technol. 51, 13705-13713 (2017)

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Open Access Green as soon as Postprint is submitted to ZB.

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The quality of dissolved organic carbon (DOC) affects both carbon cycling in surface waters and drinking water production. Not much is known about the influence of environmental conditions on DOC quality. We studied the effect of redox conditions on the chemical composition of DOC in a drinking water reservoir by Fourier transform ion cyclotron resonance mass spectrometry in combination with sediment core incubation experiments under manipulated redox conditions. We observed clear differences in DOC quality among oxic epilimnion, anoxic hypolimnion, and sediment porewater. Sediment porewater showed relatively high intensities of polyphenol-like components with H/C ratios of < 1 and O/C ratios of > 0.6. Consistent with this, anoxic incubation of a sediment core resulted in an accumulation of these components in the overlying water. The observed pattern of DOC quality change can be explained by redox-dependent adsorption/desorption of DOC on iron minerals. Under oxic conditions, the polyphenol-like components bind on freshly formed iron hydroxides, a process that affects both DOC stability in surface waters and treatability during drinking water production.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Ft-icr-ms; Molecular Formula Assignment; Rappbode Reservoir System; Solid-phase Extraction; Mass-spectrometry Data; Similar Pre-dams; Matter Dom; Lake Sediment; Optical-properties; Iron

ISSN (print) / ISBN 0013-936X

e-ISSN 1520-5851

Journal Environmental Science & Technology

Quellenangaben Volume: 51, Issue: 23, Pages: 13705-13713

Publisher ACS

Publishing Place Washington, DC

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit BioGeoChemistry and Analytics (BGC)