Einfluß von Zellkontakt und Eisen(III)-Oxidform auf die Bakterielle Eisenreduktion

Effect of cell contact and iron(III)-oxide form on bacterial iron reduction By means of a semipermeable membrane the influence of the separation of cells from Fe(III)-oxides (125–63 μm) was studied in model experiments using iron-reducing bacteria (Clostridium butyricum S 22 a and Bacillus polymyxa S 55) which lower the Eh considerably. Synthetic sieved (125–63 μm) hematite (Merck) was included in dialytic bags (pores < 20 Å), incorporated in a glucose-mineral salt broth (pH 7–7.2) and inoculated (anaerobically, 30°C). Fe(II) production (in solution), pH and Eh were measured (and the rH calculated) at regular intervals. In the second experiment, the preferential reduction of lepidocrocite, hematite and goethite was investigated, by mixing ⁵⁹Fe-labelled oxide forms with other crystalline oxides or with x-ray amorphous Go-soil material (all sieved at 125–63 μm).