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Soil Science Society of America Journal Abstract -

Biological Reduction of Structural Iron in Sodium-Nontronite


This article in SSSAJ

  1. Vol. 52 No. 1, p. 295-296
    Received: Feb 12, 1987

    * Corresponding author(s):
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  1. Jun Wu,
  2. Charles B. Roth  and
  3. Philip F. Low
  1. Institute of Soil Science, Academia Sinica, >Peop. Rep. China>
    Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907



To test the possibility that the structural Fe3+ in clay minerals can be biologically reduced, nontronite was mixed with sucrose and an aqueous extract from a Chinese paddy soil and incubated for 14 d at room temperature. Reflectance spectra, x-ray diffraction patterns and Fe2+/Fe3+ ratios were determined for the nontronite in the mixture and for the nontronite in its nonreduced and chemically reduced states. It was found that the results for the nontronite in the mixture resembled those for the chemically reduced nontronite but differed markedly from those for the nonreduced nontronite. Therefore, it was concluded that microorganisms from the soil extract were able to reduce the structural Fe3+ in nontronite.

Research supported by US Army Research Office, grant no. DAAG 29-84-K-0167, subcontract no. 84-132. Contribution of the Purdue Agric. Exp. Stn. Purdue Journal no. 11 045.

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