Microbial reduction of iron(III) oxyhydroxides: effects of mineral solubility and availability

Bonneville, Steeve; Cappellen, Philippe Van; Behrends, Thilo

doi:10.1016/j.chemgeo.2004.08.015

Cited by 244 publications

(195 citation statements)

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“…As a result, K Ã m values expressed in units of bulk concentration of the Fe(III) substrate (e.g., in moles of Fe(III) per unit volume mineral-cell suspension) are conditional, rather than intrinsic, kinetic parameters. For instance, in our earlier study, K Ã m values were shown to depend on the solid-to-cell ratio of the experimental suspensions (Bonneville et al, 2004). …”

Section: Introductionmentioning

confidence: 83%

“…Amorphous ferric oxide (HFO) and ferrihydrite 6 lines were prepared following the procedures described in Bonneville et al (2004). Lepidocrocite (Bayferrox 943) and low surface area (LSA) hematite (Bayferrox 105M) were purchased from Harold Scholz & Co., GmbH, and used as received.…”

Section: Fe(iii) Oxyhydroxidesmentioning

confidence: 99%

“…The grain size and shape (obtained using TEM), and the specific surface area (measured by N 2 BET) of the different Fe(III) oxyhydroxides are listed in Table 1. a Maximum cell-normalized iron reduction rate by S. putrefaciens in the presence of excess lactate (from Bonneville et al, 2004). b LSA = low surface area.…”

Section: Fe(iii) Oxyhydroxidesmentioning

confidence: 99%

“…The observed parabolic dependence of the Fe(III) reduction rate on the mineral concentration could be fitted to the Michaelis-Menten rate equation, yielding a maximum reduction rate per cell, v max , and an apparent half-saturation constant, K Ã m . The value of v max was found to be characteristic of the oxyhydroxide mineral undergoing reduction, generally increasing with increasing mineral solubility (Bonneville et al, 2004).…”

Section: Introductionmentioning

confidence: 96%

“…In a recent study, we showed that the initial reduction kinetics of a variety of Fe(III) oxyhydroxides by the iron reducing bacterium Shewanella putrefaciens systematically exhibit saturation with respect to the Fe(III) substrate availability (Bonneville et al, 2004). The observed parabolic dependence of the Fe(III) reduction rate on the mineral concentration could be fitted to the Michaelis-Menten rate equation, yielding a maximum reduction rate per cell, v max , and an apparent half-saturation constant, K Ã m .…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Fe(III) colloids by Shewanella putrefaciens: A kinetic model

Bonneville

Behrends

Cappellen

et al. 2006

Geochimica et Cosmochimica Acta

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A kinetic model for the microbial reduction of Fe(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The model assumes a two-step mechanism: (1) attachment of Fe(III) colloids to the cell surface and (2) reduction of Fe(III) centers at the surface of attached colloids. The validity of the model is tested using Shewanella putrefaciens and nanohematite as model dissimilatory iron reducing bacteria and Fe(III) colloidal particles, respectively. Attachment of nanohematite to the bacteria is formally described by a Langmuir isotherm. Initial iron reduction rates are shown to correlate linearly with the relative coverage of the cell surface by nanohematite particles, hence supporting a direct electron transfer from membrane-bound reductases to mineral particles attached to the cells. Using internally consistent parameter values for the maximum attachment capacity of Fe(III) colloids to the cells, M max , the attachment constant, K P , and the first-order Fe(III) reduction rate constant, k, the model reproduces the initial reduction rates of a variety of finegrained Fe(III) oxyhydroxides by S. putrefaciens. The model explains the observed dependency of the apparent Fe(III) half-saturation constant, K Ã m , on the solid to cell ratio, and it predicts that initial iron reduction rates exhibit saturation with respect to both the cell density and the abundance of the Fe(III) oxyhydroxide substrate.

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Section: Introductionmentioning

confidence: 83%

Section: Fe(iii) Oxyhydroxidesmentioning

confidence: 99%

Section: Fe(iii) Oxyhydroxidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations