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Environmental Geochemistry and Health

, Volume 41, Issue 1, pp 461–467 | Cite as

Reductive dissolution and sequestration of arsenic by microbial iron and thiosulfate reduction

  • Myoung-Soo Ko
  • Seunghak Lee
  • Kyoung-Woong KimEmail author
Original Paper
  • 130 Downloads

Abstract

Iron oxide and oxy-hydroxide are commonly used for remediation and rehabilitation of arsenic (As)-contaminated soil and water. However, the stability of As sequestered by iron oxide and oxy-hydroxide under anaerobic conditions is still uncertain. Geochemical properties influence the behavior of As; in addition, microbial activities affect the mobility of sequestered As in soil and water. Microbial-mediated iron reduction can increase the mobility of As by reductive dissolution of Fe oxide; however, microbial-mediated sulfate reduction can decrease the mobility of As by sulfide mineral precipitation. This study investigated the geomicrobial impact on the behavior of As and stability of sequestered As in iron-rich sediment under anaerobic conditions. Increase in Fe(II) concentrations in water was evidence of microbial-mediated iron reduction. Arsenic concentrations increased with Fe(II) concentration; however, the thiosulfate reduction process also induced immobilization of As through the precipitation of AsFeS. Therefore, microbial-mediated iron reduction and thiosulfate reduction have opposite influences on the mobility of As under anaerobic condition.

Keywords

Arsenic Sequestration Reductive dissolution Microbial reduction 

Notes

Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1A6A3A04008168). The authors thank Ronald S. Oremland, Laurence G. Miller, Jodi Switzer Blum for stimulating discussions.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Earth Sciences and Environmental EngineeringGwangju Institute of Science and Technology (GIST)GwangjuRepublic of Korea
  2. 2.Center for Water Resource Cycle, Green City Technology InstituteKorea Institute of Science and Technology (KIST)SeoulRepublic of Korea

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