Biogenic iron mineralization accompanying the dissimilatory reduction of hydrous ferric oxide by a groundwater bacterium

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/S0016-7037(98)00243-9· OSTI ID:338612

Fredrickson, J K; Zachara, J M; Kennedy, D W; Li, S M ^[1]; Dong, H; Onstott, T C ^[2]; Hinman, N W ^[3]

---

1. Pacific Northwest National Lab., Richland, WA (United States)
2. Princeton Univ., NJ (United States). Dept. of Geosciences
3. Univ. of Montana, Missoula, MT (United States). Dept. of Geology

The purpose of this research was to investigate the bacterial reduction of hydrous ferric oxide (HFO) by Shewanella putrefaciens and the nature of biogenic secondary phase formation in the presence of different inorganic ligands (PO{sub 4} and HCO{sub 3}) under conditions that may promote or suppress the organism/oxide association (i.e., with and without an electron shuttle). The electron shuttle used, anthraquinone-2,6-disulfonate (AQDS), is both a humic acid analog and a soluble redox indicator. The goal was to provide insights on biogeochemical factors governing dissimilatory biogenic mineralization in sediment or groundwater systems. The authors have investigated the influence of AQDS on the rate and extent of HFO reduction in different buffered systems and utilized X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) to evaluate the crystallographic and morphologic features of the biogenic precipitates. The biogenic phase association is interpreted in light of aqueous solution conditions, pe, solid phase thermodynamic stability, and microbiological considerations including metabolic status and growth with the intent of identifying unique microbiological contributions to secondary mineralization.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830; FG05-90ER61039
• OSTI ID: 338612
• Journal Information: Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Journal Issue: 19-20 Vol. 62; ISSN 0016-7037; ISSN GCACAK
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
ACID CARBONATES
BACTERIA
BIODEGRADATION
BIOGEOCHEMISTRY
GROUND WATER
IRON
IRON OXIDES
MINERALIZATION
PHOSPHATES
REDUCTION