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Appl Environ Microbiol. 1982 February; 43(2): 319-324

Reduction of Ferric Iron in Anaerobic, Marine Sediment and Interaction with Reduction of Nitrate and Sulfate

Institute of Ecology and Genetics, University of Aarhus, DK-8000 Aarhus C, Denmark

ABSTRACT

Studies were carried out to elucidate the nature and importance of Fe³⁺ reduction in anaerobic slurries of marine surface sediment. A constant accumulation of Fe²⁺ took place immediately after the endogenous NO₃^– was depleted. Pasteurized controls showed no activity of Fe³⁺ reduction. Additions of 0.2 mM NO₃^– and NO₂^– to the active slurries arrested the Fe³⁺ reduction, and the process was resumed only after a depletion of the added compounds. Extended, initial aeration of the sediment did not affect the capacity for reduction of NO₃^– and Fe³⁺, but the treatments with NO₃^– increased the capacity for Fe³⁺ reduction. Addition of 20 mM MoO₄^2– completely inhibited the SO₄^2– reduction, but did not affect the reduction of Fe³⁺. The process of Fe³⁺ reduction was most likely associated with the activity of facultative anaerobic, NO₃^–-reducing bacteria. In surface sediment, the bulk of the Fe³⁺ reduction may be microbial, and the process may be important for mineralization in situ if the availability of NO₃^– is low.

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