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Science 7 November 1997:
Vol. 278. no. 5340, pp. 1106 - 1109
DOI: 10.1126/science.278.5340.1106
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Reports

Abiotic Selenium Redox Transformations in the Presence of Fe(II,III) Oxides

S. C. B. Myneni, * T. K. Tokunaga, G. E. Brown Jr.

Many suboxic sediments and soils contain an Fe(II,III) oxide called green rust. Spectroscopic evidence showed that selenium reduces from an oxidation state of +VI to 0 in the presence of green rust at rates comparable with those found in sediments. Selenium speciation was different in solid and aqueous phases. These redox reactions represent an abiotic pathway for selenium cycling in natural environments, which has previously been considered to be mediated principally by microorganisms. Similar green rust-mediated abiotic redox reactions are likely to be involved in the mobility of several other trace elements and contaminants in the environment.

S. C. B. Myneni and T. K. Tokunaga, Earth Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA.
G. E. Brown Jr., Department of Geological and Environmental Sciences and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305, USA.
*   To whom correspondence should be addressed.

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