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Nanosized iron oxides strongly enhance microbial iron reduction

Title data

Bosch, Julian ; Heister, Katja ; Hofmann, Thilo ; Meckenstock, Rainer U.:
Nanosized iron oxides strongly enhance microbial iron reduction.
In: Applied and Environmental Microbiology. Vol. 76 (2010) Issue 1 . - pp. 184-189.
ISSN 1098-5336

Abstract in another language

Microbial iron reduction is considered to be a significant subsurface process. The rate-limiting bioavailability of the insoluble iron oxyhydroxides, however, is a topic for debate. Surface area and mineral structure are recognized as crucial parameters for microbial reduction rates of bulk, macroaggregate iron minerals. However, a significant fraction of iron oxide minerals in the subsurface is supposed to be present as nanosized colloids. We therefore studied the role of colloidal iron oxides in microbial iron reduction. In batch growth experiments with Geobacter sulfurreducens, colloids of ferrihydrite (hydrodynamic diameter 336 nm), hematite (123 nm), goethite (157 nm), and akaganeite (64 nm) were added as electron acceptors. The colloidal iron oxides were reduced up to two orders of magnitude more rapidly (up to 1255 pmol h-1 cell-1) than bulk macroaggregates of the same iron phases (6 - 70 pmol h-1 cell-1). The increased reactivity was not only due to the large surface areas of the colloidal aggregates but also due to a higher reactivity per unit surface. We hypothesize that this is attributed to the high bioavailability of the nanosized aggregates and their colloidal suspension. Furthermore, a strong enhancement of reduction rates of bulk ferrihydrite was observed when nanosized ferrihydrite aggregates were added.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER109769
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 07 Aug 2015 06:59
Last Modified: 07 Aug 2015 06:59