Abstract:
:Several anaerobic bacteria isolated from the sediments of Contrary Creek, an iron-rich environment, produced magnetite when cultured in combinations but not when cultured alone in synthetic iron oxyhydroxide medium. When glucose was added as a carbon source, the pH of the medium decreased (to 5.5) and no magnetite was formed. When the same growth medium without glucose was used, the pH increased (to 8.5) and magnetite was formed. In both cases, Fe was released into the growth medium. Geochemical equilibrium equations with E(h) and pH as master variables were solved for the concentrations of iron and inorganic carbon that were observed in the system. Magnetite was predicted to be the dominant iron oxide formed at high pHs, while free Fe or siderite were the dominant forms of iron expected at low pHs. Thus, magnetite formation occurs because of microbial alteration of the local E(h) and pH conditions, along with concurrent reduction of ferric iron (direct biological reduction or abiological oxidation-reduction reactions).
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Bell PE,Mills AL,Herman JSdoi
10.1128/AEM.53.11.2610-2616.1987keywords:
subject
Has Abstractpub_date
1987-11-01 00:00:00pages
2610-6issue
11eissn
0099-2240issn
1098-5336journal_volume
53pub_type
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