10.1021/acs.est.7b04194.s001
Tallent Dadi
Tallent
Dadi
Mourad Harir
Mourad
Harir
Norbert Hertkorn
Norbert
Hertkorn
Matthias Koschorreck
Matthias
Koschorreck
Philippe Schmitt-Kopplin
Philippe
Schmitt-Kopplin
Peter Herzsprung
Peter
Herzsprung
Redox
Conditions Affect Dissolved Organic Carbon Quality
in Stratified Freshwaters
American Chemical Society
2017
DOC quality
ion cyclotron resonance mass spectrometry
redox conditions
surface waters
DOC quality change
sediment core incubation experiments
Dissolved Organic Carbon Quality
polyphenol-like components bind
drinking water production
drinking water reservoir
2017-11-07 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Redox_Conditions_Affect_Dissolved_Organic_Carbon_Quality_in_Stratified_Freshwaters/5612812
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.