NDLI: The Importance of Microbial Iron Sulfide Oxidation for Nitrate Depletion in Anoxic Danish Sediments

Content Provider	Springer Nature Link
Author	Vaclavkova, Sarka Jørgensen, Christian Juncher Jacobsen, Ole Stig Aamand, Jens Elberling, Bo
Copyright Year	2014
Abstract	Nitrate (NO3 −) reduction processes are important for depleting the NO3 − load from agricultural source areas before the discharge water reaches surface waters or groundwater aquifers. In this study, we experimentally demonstrate the co-occurrence of microbial iron sulfide oxidation by NO3 − (MISON) and other NO3 −-depleting processes in a range of contrasting sediment types: sandy groundwater aquifer, non-managed minerotrophic freshwater peat and two brackish muddy sediments. Approximately 1/3 of the net NO3 − reduction was caused by MISON in three of the four environments despite the presence of organic carbon in the sediment. An apparent salinity limitation to MISON was observed in the most brackish environment. Addition of high surface area synthetically precipitated iron sulfide (FeS x ) to the aquifer sediment with the lowest natural FeS x reactivity increased both the relative fraction of NO3 − reduction linked to MISON from approximately 30–100 % and the absolute rates by a factor of 17, showing that the potential for MISON-related NO3 − reduction is environmentally significant and rate limited by the availability of reactive FeS x .
Starting Page	419
Ending Page	435
Page Count	17
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	20
Issue Number	4
e-ISSN	15731421
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-03-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microbial denitrification Nitrate Iron sulfide Anoxic pyrite oxidation Specific surface area Freshwater and brackish environments Geochemistry Hydrology/Water Resources Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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