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Redox characterization of humins in sediments from the Yangtze Estuary to the East China Sea and their effects on microbial redox reactions

  • Chunfang Zhang
  • Shaohong You
  • Hongyue Dang
  • Zhiling Li
  • Qinglin Xie
  • Dongdong ZhangEmail author
Sediments, Sec 2 • Physical and Biogeochemical Processes • Research Article
  • 87 Downloads

Abstract

Purpose

Humins, as solid-phase redox mediators, are important for enhancing anaerobic biotransformation processes. Although humins are broadly distributed in estuarine and marine sediments, to date, their electron transfer capacity (ETC) from marine sediments has been poorly characterized. This study determined the potential of humins as redox mediators for microbial redox metabolic reactions in sediments along a transect from the Yangtze Estuary to the adjacent East China Sea and analyzed their electron-mediating characteristics.

Materials and methods

Comparative analyses of humins in sediments along this transect were conducted to investigate their ETC as redox mediators for microbial redox metabolic reactions, namely dissimilatory iron reduction (DIR) and dissimilatory nitrate reduction to ammonium (DNRA), using Shewanella oneidensis MR-1. Elemental composition, electrochemical, and Fourier transform infrared analyses were performed to better understand the functional redox groups in humins.

Results and discussion

All the humins functioned as solid-phase redox mediators and enhanced DIR and DNRA by Shewanella oneidensis, although with varying efficacy. The humins extracted from sampling site P1 (P1-HM), located close to the Yangtze Estuary, most effectively enhanced iron and nitrate reduction without nitrite accumulation. Electrochemical analysis confirmed the highest redox activity and ETC in P1-HM and a weakening trend of ETC with increasing distance from the estuary. Fourier transform infrared analysis suggested that quinone moieties might serve as key redox functional groups in humins.

Conclusions

Considering their high yield and ETC, P1-HM could be important redox mediators that influence microbial redox metabolic reactions in sedimentary ecosystems of the Yangtze Estuary. Thus, this study provides insights into the distribution of humins, their ECT, and their potential role as redox mediators for microbial redox reactions, which could improve understanding of elemental biogeochemical cycling processes involving microorganisms in the Yangtze Estuary and East China Sea sedimentary ecosystems and provide important reference information for researches on other estuary areas.

Keywords

East China Sea Electron transfer capacity Humins Microbial redox metabolic reactions Sedimentary ecosystem Yangtze Estuary 

Notes

Funding

This work was financially supported by the National Natural Science Foundation of China (Nos. 41701346, 41676122), the National Key Research and Development Program of China (No. 2016YFA0601303), the Fundamental Research Funds for the Central Universities (No. 2017QNA4045), and the State Key Laboratory of Marine Environmental Science Visiting Fellowship (No. MELRS1618).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Supplementary material

11368_2018_2235_MOESM1_ESM.docx (67 kb)
ESM 1 (DOCX 66 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Marine Biology, Ocean CollegeZhejiang UniversityZhoushanChina
  2. 2.College of Environmental Science and EngineeringGuilin University of TechnologyGuilinChina
  3. 3.State Key Laboratory of Marine Environmental ScienceXiamen UniversityXiamenChina
  4. 4.State Key Laboratory of Urban Water Resources and Environment, School of EnvironmentHarbin Institute of TechnologyHarbinChina

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