Comparisons of structural iron reduction in smectites by bacteria and dithionite: II. A variable-temperature Mössbauer spectroscopic study of Garfield nontronite [Structure and function of subsurface microbial communities affecting radionuclide transport and bioimmobilization: Iron mineralogy phase]

Journal Article · Fri Jul 24 00:00:00 EDT 2009 · Pure and Applied Chemistry

DOI:https://doi.org/10.1351/PAC-CON-08-11-16· OSTI ID:1013109

Ribeiro, Fabiana R.; Fabris, José D.; Kostka, Joel E.; Komadel, Peter; Stucki, Joseph W.

The reduction of structural Fe in smectite may be mediated either abiotically by reaction with chemical reducing agents or biotically by reaction with various bacterial species. The effects of abiotic reduction on clay surface chemistry are much better known than the effects of biotic reduction, and differences between them are still in need of investigation. The purpose of the present study was to compare the effects of dithionite (abiotic) and bacteria (biotic) reduction of structural Fe in nontronite on the clay structure as observed by variable-temperature Mössbauer spectroscopy. Biotic reduction was accomplished by incubating Na-saturated Garfield nontronite (sample API 33a) with

• Research Organization: Univ. of Illinois at Urbana-Champaign, IL (United States)
• Sponsoring Organization: USDOE CI Deputy Assistant Secretary for Energy Policy (CI-30); USDOE Office of the Secretary of Energy Advisory Board (AB)
• DOE Contract Number: FG02-07ER64374
• OSTI ID: 1013109
• Report Number(s): 0013028
• Journal Information: Pure and Applied Chemistry, Vol. 81, Issue 8; ISSN 0033-4545
• Publisher: IUPAC
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
redox
reduction
oxidation
cycles
nontronite
bacteria
shewanella