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Hyperfine Interactions

, 240:115 | Cite as

A study on evaluation of redox condition of Tokyo Bay using chemical states of sedimentary iron as an indicator by means of Mössbauer spectroscopy

  • Masashi KomoriEmail author
  • Katsumi Shozugawa
  • Yun Guan
  • Motoyuki Matsuo
Article
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Part of the following topical collections:
  1. Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2019), Goa, India, 10-15 February 2019

Abstract

We applied 57Fe Mössbauer spectroscopy to sediment cores and tried to build method of estimating historical redox condition of Tokyo Bay in Japan, by using chemical state of iron as an index. As a result of measurement, there are more iron (hydr) oxide and less pyrite in sediment core sampled at Yokohama (near center of Tokyo Bay) than sediment cores sampled at inner part of the bay. This is in good agreement with water quality data and indicates that the amount of dissolved oxygen at different points can be compared by the amount of iron (hydr)oxide or pyrite. We also observed pyrite in most samples and revealed that anoxic condition had widely occurred in Tokyo Bay. In addition, a good negative correlation was found between the pyrite abundance ratio in the sediment and dissolved oxygen in seawater in summer. It was suggested that the abundance ratio of pyrite can be a quantitative indicator for the occurrence of anoxic water masses.

Keywords

57Fe Mössbauer spectroscopy Hypoxia Tokyo Bay Sediment core Pyrite 

Notes

Acknowledgments

This work was supported by Grant-in-Aid for Scientific Research (C) JP15K00515 and JP18K11613. Water quality data for Honmoku monitoring spot was provided by Yokohama Environmental Monitoring Center. Water quality data for Tokyo light beacon and Chiba light beacon was provided by Japan Oceanographic Data Center. Water quality data for Chiba wave observation towers was provided by Tokyo Bay Environmental Information Center.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
  2. 2.Yokohama Environmental Science Research InstituteYokohamaJapan

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