NDLI: Dissolved Fe2+ and ∑H2S Behavior in Sediments Seasonally Overlain by Hypoxic-to-anoxic Waters as Determined by CSV Microelectrodes

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Dissolved Fe2+ and ∑H2S Behavior in Sediments Seasonally Overlain by Hypoxic-to-anoxic Waters as Determined by CSV Microelectrodes

Content Provider	Springer Nature Link
Author	Sell, Karen S. Morse, John W.
Copyright Year	2006
Abstract	Variability of dissolved Fe2+ and ∑H2S concentrations in porewaters were studied, using cathodic stripping voltammetry (CSV) microelectrodes, in sediments overlain by hypoxic waters in the summer from the southeastern region of Corpus Christi Bay, Texas (CCB) and the Mississippi River Bight (MRB), Louisiana. These measurements were complimented by sediment microcosm studies where oxygen concentrations in the overlying water were manipulated. Sulfate reduction rates, benthic oxygen demand, total reduced sulfide, porewater sulfate, and total organic carbon were also determined. Fe2+ and ∑H2S were the major dissolved redox-reactive dissolved species in these sediments. During hypoxic conditions, an upward migration of porewater Fe2+ and ∑H2S occurred, with Fe2+ reaching much higher maximum concentrations than ∑H2S. Statistically significant (p < 0.05) differences in both Fe2+ and ∑H2S occurred between sediments at the CCB and MRB study sites. Although both sites were Fe-dominated, reactive and dissolved iron were higher while ∑H2S was lower at the MRB site. However, there were no statistically significant (p > 0.05) difference in regard to ∑H2S between microcosm and field monitoring studies. Results indicated that, for Fe2+ and ∑H2S, relatively large and rapid changes occurred in both the concentrations and distributions of these important porewater constituents in response to relatively short-term changes in overlying water oxygen content. Model calculations indicated that conditions in the sediments can be responsible for the induction of hypoxic conditions in the formation of hypoxic overlying waters in <6 days at CCB and ~20 days at MRB.
Starting Page	179
Ending Page	198
Page Count	20
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	12
Issue Number	2
e-ISSN	15731421
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	benthic oxygen demand hypoxia microelectrodes porewater iron and sulfide sedimentary biogeochemistry Geochemistry Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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