气候变化领域集成服务门户(CCPortal): Mediated electrochemical analysis as emerging tool to unravel links between microbial redox cycling of natural organic matter and anoxic nitrogen cycling

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DOI	10.1016/j.earscirev.2020.103281
	Mediated electrochemical analysis as emerging tool to unravel links between microbial redox cycling of natural organic matter and anoxic nitrogen cycling
	Li S.; Kappler A.; Zhu Y.; Haderlein S.B.
发表日期	2020
ISSN	00128252
卷号	208
英文摘要	Natural organic matter (NOM) is an important redox-active component in soils and aquifers that comprises numerous functional moieties spanning a wide range of redox potentials. Tracking reversible electron transfer from and to NOM in biogeochemical redox processes has been a challenge for decades. Reasons include side reactions of reactants used to determine the redox state of NOM and slow reaction kinetics of reactants or traditional non-mediated electrochemical methods. Furthermore, partially irreversible reactions/methods employed hamper the experimental determination of redox properties of NOM. Recent advances in mediated electrochemical analysis, however, have greatly improved our ability to characterize the redox properties of NOM. Thus, mediated electrochemical analysis may become an important tool in expanding our understanding of NOM-fueled biogeochemical N cycling in anoxic environments. Nonetheless, this technique has rarely been applied to investigate microbial pathways of reversible NOM redox cycling such as its coupling to anoxic nitrogen (N) cycling. Here we advocate for employing mediated electrochemical analysis to address such topics in the future and provide recommendations for a successful experimental application of this method in the presence of reactive N-species. To this end, we review recent applications of mediated electrochemical analysis in studying microbial NOM cycling. We exemplify the potential of mediated electrochemical techniques for biogeochemical research by discussing how microbial NOM redox cycling is linked to anaerobic N cycling. We focus on anaerobic ammonium oxidation (anammox) and reduction of N-oxides that are related to N loss and nitrous oxide (N2O) mitigation. Finally, we present strategies to work around problems arising from electroactive intermediates that hamper the application of mediated electrochemical analysis in microbial experiments. © 2020 Elsevier B.V.
关键词	Biogeochemistry Geomicrobiology Humic substances Nitrogen cycle Redox processes
英文关键词	ammonium; anaerobic digestion; anoxic conditions; biogeochemical cycle; electrochemical method; experimental study; groundwater; microbial activity; nitrogen cycle; organic matter; oxidation; redox conditions; redox potential; soil chemistry; water chemistry
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203778
作者单位	Environmental Mineralogy & Chemistry, Center for Applied Geosciences, University of Tübingen, Schnarrenbergstr. 94-96, Tübingen, 72076, Germany; Geomicrobiology, Center for Applied Geosciences, University of Tübingen, Schnarrenbergstr. 94-96, Tübingen, 72076, Germany; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
推荐引用方式 GB/T 7714	Li S.,Kappler A.,Zhu Y.,et al. Mediated electrochemical analysis as emerging tool to unravel links between microbial redox cycling of natural organic matter and anoxic nitrogen cycling[J],2020,208.
APA	Li S.,Kappler A.,Zhu Y.,&Haderlein S.B..(2020).Mediated electrochemical analysis as emerging tool to unravel links between microbial redox cycling of natural organic matter and anoxic nitrogen cycling.Earth Science Reviews,208.
MLA	Li S.,et al."Mediated electrochemical analysis as emerging tool to unravel links between microbial redox cycling of natural organic matter and anoxic nitrogen cycling".Earth Science Reviews 208(2020).