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Mineralogical Magazine Mineralogical Magazine

Article contents

Bioreduction of iodate in sediment microcosms

Published online by Cambridge University Press:  02 January 2018

Fabiola Guido-Garcia ,
Gareth T. W. Law ,
Jonathan R. Lloyd ,
Paul Lythgoe  and
Katherine Morris
Fabiola Guido-Garcia
Affiliation:
Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, The University of Manchester, Williamson Building, Oxford Road, Manchester M13 9PL, UK
Gareth T. W. Law
Affiliation:
Centre for Radiochemistry Research, The University of Manchester, School of Chemistry, Oxford Road, Manchester M13 9PL, UK
Jonathan R. Lloyd
Affiliation:
Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, The University of Manchester, Williamson Building, Oxford Road, Manchester M13 9PL, UK
Paul Lythgoe
Affiliation:
Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, The University of Manchester, Williamson Building, Oxford Road, Manchester M13 9PL, UK
Katherine Morris
Affiliation:
Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, The University of Manchester, Williamson Building, Oxford Road, Manchester M13 9PL, UK
Corresponding
E-mail address:
katherine.morris@manchester.ac.uk
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Abstract

Iodine-129 is a high-yield fission product formed in nuclear reactors and is a risk-driving radionuclide in both contaminated land and radioactive waste disposal due to its high mobility and long half-life. Here, the bioreduction behaviour of iodate was investigated by tracking iodine speciation and concentration in solution during the development of progressive anoxia in sediment microcosm experiments incubated at neutral pH. Experiments with acetate added as an electron donor showed the expected cascade of terminal electron-accepting processes. Analysis of solution chemistry showed reduction of iodate to iodide during the early stages of metal (Mn(IV) and Fe(III)) reduction, but with no significant retention of iodine species on solids. There was, however, a net release of natural iodine associated with the sediments to solution when robust iron reduction / sulfate reduction had developed. In addition, over 210 days, the controls with no electron donor and the sterile controls showed no Mn(IV) or Fe(III) reduction but displayed modest sorption of iodate to the sediments in the absence of bioreduction. Overall these results show that under oxic conditions iodate may be partially sorbed to sediments over extended periods but that development of mildly reducing conditions leads to the reductive release of iodine to solution as iodide.

Keywords

iodate iodide speciation bioreduction radioactive iodine
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 6 , November 2015 , pp. 1343 - 1351
Creative Commons
Copyright © The Mineralogical Society of Great Britain and Ireland 2015. This is an open access article, distributed under the terms of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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