The different oxidation species of iodine have markedly different sorption properties. Hence, changes in iodine redox states can greatly affect the mobility of iodine in the environment. Although a major microbial role has been suggested in the past to account for these redox changes, little has been done to elucidate the responsible microorganisms or the mechanisms involved. In the work presented here, direct microbial reduction of iodate was demonstrated with anaerobic cell suspensions of the sulfate reducing bacterium Desulfovibrio desulfuricans which reduced 96% of an initial 100 µM iodate to iodide at pH 7 in 30 mM NaHCO3 buffer, whereas anaerobic cell suspensions of the dissimilatory Fe(III)-reducing bacterium Shewanella putrefaciens were unable to reduce iodate in 30 mM NaHCO3 buffer (pH 7). Both D. desulfuricans and S. putrefaciens were able to reduce iodate at pH 7 in 10 mM HEPES buffer. Both soluble ferrous iron and sulfide, as well as iron monosulfide (FeS) were shown to abiologically reduce iodate to iodide. These results indicate that ferric iron and/or sulfate reducing bacteria are capable of mediating both direct, enzymatic, as well as abiotic reduction of iodate in natural anaerobic environments. These microbially mediated reactions may be important factors in the fate and transport of129 I in natural systems.
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Behrens, H.: 1982, Environmental Migration of Long-Lived Radionuclides, Conference Proceedings, July 27- 31, 1981, Knoxville, IAEA-SM- 257/36, International Atomic Energy Agency, Vienna, p. 24–30.
Brock, T. D. and O'Dea, K.: 1977, Appl. Environ. Microbiol. 22, 254.
Chapman, N. A. and McKinley, I. G.: 1987, The Geological Disposal of Nuclear Waste, John Wiley & Sons, p. 280.
Christiansen, J. V. and Carlsen, L.: 1989, Riso National Laboratory, Denmark. Riso-M 2791, p. 41.
Coleman, M. L., Hedrick, D. B., Lovley, D. R., White, D. C. and Pye, K.: 1993, Nature 361, 436.
Couture, R. A. and Seitz, M. G.: 1983, Nucl. Chem. Waste Manage. 4, 301.
Eisenbud, M.: 1987, Environmental Radioactivity (3rd ed.), Academic Press, p. 270.
Erdal, B. R.: 1985, Workshop on Fundamental Geochemistry Needs for Nuclear Waste Isolation U.S. Department of Energy. CONF8406134.
Francois, R.: 1987, Geochim. et Cosmochim. Acta 51, 2417.
Gozlan, R. S. and Margalith, P.: 1973, J. Appl. Bact. 36, 407.
Gozlan, R. S. and Margalith, P.: 1974, J. Appl. Bact. 37, 493.
Ginkel, C. G., Plugge, C. M. and Stroo, C. A.: 1995, Chemosphere 31, 4057.
Hackett, I. J.: 1971, The Reduction of Iodate by Marine Bacteria, University of Wales, United Kingdom, M. Sc. dissertation.
Higgo, J. J.W., Haign, D. G., Allen, M. R., Warwick, P. and Williams, G.M.: 1990, British Geological Survey, Technical Report WE/89/44, p. 33.
Hijnen, W. A. M., Voogt, R., Veendendaal, H. R., Van Der Jagt, H. and Van Der Kooij, D.: 1995, Appl. Environ. Microbiol. 61, 239.
Krieg, N. R. and Holt, J. G.: 1984, Bergey's Manual of Systematic Bacteriology, Volume 1, Williams and Wilkins, p. 694.
Liu, Y. and von Gunten, H. R.: 1988, Paul Scherrer Institute. Bericht Nr. 16, p. 183.
Lovley, D. R.: 1994, Adv. Agronomy 54, 175.
Lovley, D. R., Roden, E., Phillips, E. J. P. and Woodward, J. C.: 1993, Marine Geol. 113, 41.
Lovley, D. R. and Phillips, E. J. P.: 1992, Appl. Environ. Microbiol. 58, 850.
Lovley, D. R.: 1991, Microbiol. Reviews 55, 259.
Lovley, D. R., Phillips, E. J. P. and Longeran D. J.: 1989, Appl. Environ. Microbiol. 55, 700.
Lowry, O. H., Rosebrough, N. L., Farr, A. L. and Randall, R. J.: 1951, J. Biol. Chem. 193, 265.
Luther, G. W. and Cole, H.: 1988, Marine Chem. 24, 315.
Mackin, J. E., Allure, R. C. and Pullman, W. J.: 1988, Cont. Shelf Res. 8, 363.
Malmqvist, A., Welder, T. and Gunnarson, L.: 1991, Appl. Environ. Microbiol. 57, 2229.
Muramatsu, Y., Uchida, S. and Ohmomo, Y.: 1990, J. Radioanal. Nucl. Chem. 138, 377.
Neal, C. and Truesdale, V. W.: 1976, J. Hydrology. 31, 281.
Phillips, E. J. P., Lovley, D. R. and Landa, E. R.: 1995, J. Industr. Microbiol. 14, 203.
Skimer, B. J., Red, R. C. and Grimaldi, F. S.: 1964, American Mineral. 49, 543.
Ticknor, K. V. and Cho, Y. H.: 1990, J. Radioanal. Nucl. Chem. 140, 75.
Truesdale, V. and Spencer, C. P.: 1974, Marine Chem. 2, 22.
Tsunogai, S. and Sase, T.: 1969, Deep-Sea Res. 16, 489.
Ullman, W. J. and Allure, R. C.: 1985, Geochim. et Cosmochim. Acta 49, 967.
Wong, G. T. and Brewer, P. G.: 1977, Geochim. et Cosmochim. Acta 41, 151.
Zhang, J.-Z. and Whitefield, M.: 1986, Marine Chem. 19, 121.
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Councell, T.B., Landa, E.R. & Lovley, D.R. Microbial Reduction of Iodate. Water, Air, & Soil Pollution 100, 99–106 (1997). https://doi.org/10.1023/A:1018370423790
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