Cycling of iron and manganese in surface sediments; a general theory for the coupled transport and reaction of carbon, oxygen, nitrogen, sulfur, iron, and manganese

Cappellen, Philippe Van; Wang, Yifeng

doi:10.2475/ajs.296.3.197

Cited by 534 publications

(352 citation statements)

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“…This ex-CH O 2 pression is functionally identical to the framework used in recent diagenetic models of Fe(III) oxide reduction and other biogeochemical processes in aquatic sediments (Boudreau 1996;Van Cappellen and Wang 1996). In this framework, Fe(III) oxide reduction rates are assumed to first order with respect to Fe(III) Relationship between FeRB abundance and Fe(III) reduction kinetics-A MPN enumeration procedure employing synthetic growth medium was used to evaluate the potential importance of changes in FeRB population size to the response of microbial Fe(III) oxide reduction to addition of different amounts of labile OM.…”

Section: Discussionmentioning

confidence: 88%

“…Understanding the kinetics of microbial Fe(III) oxide reduction is a prerequisite for modeling carbon and energy flux through sedimentary Fe cycling and the impact of Fe(III) oxide reduction on other electron-accepting processes (Thamdrup 2000), as well as for predicting the fate of inorganic and organic contaminants whose behavior is linked to Fe redox chemistry (Van Cappellen and Wang 1995). To date there has been no definitive demonstration of the kinetics of this process, e.g., in a manner analogous to how the kinetics of bacterial sulfate reduction in marine sediments has been defined in relation to sulfate and particulate organic carbon concentration (Boudreau and Westrich 1984;Westrich and Berner 1984).…”

mentioning

confidence: 99%

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Kinetics of microbial Fe(III) oxide reduction in freshwater wetland sediments

Roden

Wetzel

2002

Limnology & Oceanography

157

111

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The kinetics of microbial amorphous Fe(III) oxide reduction was investigated in sediments from a freshwater wetland in north central Alabama, USA. Fe(III) oxide concentrations decreased exponentially with time during anaerobic incubation of sediment slurries and homogenized surface sediments. Rates of organic carbon mineralization (⌺CO 2 ϩ CH 4 accumulation) did not change markedly during the course of Fe(III) oxide reduction, which indicated that the exponential decline in Fe(III) oxide concentration over time resulted primarily from Fe(III) limitation rather than a decrease in organic matter decay rate. Initial rates of Fe(III) oxide reduction were linearly correlated with initial Fe(III) oxide concentrations in experiments with mixtures of Fe(III)-rich and Fe(III)-depleted sediment slurries. Similar results were obtained in experiments with sediment from various depth intervals in the upper 3 cm of freshly collected cores. These findings provide explicit evidence that microbial Fe(III) oxide reduction rates are first order with respect to amorphous Fe(III) oxide concentration in the wetland sediment. The observed first-order relationship between Fe(III) oxide concentration and reduction rate is consistent with established models of surface area-controlled mineral transformation. An experiment in which Fe(III) oxide-rich sediment slurries were amended with different amounts of labile organic matter demonstrated a direct correlation between first-order Fe(III) reduction rate constants and initial rates of organic carbon mineralization. These results provide empirical support for existing approaches to modeling organic matter decay-dependent Fe(III) oxide reduction kinetics in sediments.

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Section: Discussionmentioning

confidence: 88%

mentioning

confidence: 99%

Kinetics of microbial Fe(III) oxide reduction in freshwater wetland sediments

Roden

Wetzel

2002

Limnology & Oceanography

157

111

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“…For O 2 concentrations below kmo2, the reaction is limited by O 2 , while denitrification is simultaneously activated. Further details on the implementation of the rate laws for organic matter degradation can be found in Van Cappellen and Wang (1996), Hunter et al (1998) and Aguilera et al (2005).…”

Section: Main Reaction Networkmentioning

confidence: 99%

“…Dissociation of carbonic acid is included as an equilibrium reaction. Rates of mineral precipitation and dissolution reactions depend on the degree of mineral under-or supersaturation of the groundwater (Table 1), using the formulations in Van Cappellen and Wang (1996).…”

Section: Main Reaction Networkmentioning

confidence: 99%

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Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

Spiteri

Slomp

Regnier

et al. 2007

Journal of Contaminant Hydrology

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A 1D reactive transport model (RTM) is used to obtain a mechanistic understanding of the fate of phosphorus (P) in the saturated zone of two contrasting aquifer systems. We use the field data from two oxic, electron donor-poor, wastewater-impacted, sandy Canadian aquifers, (Cambridge and Muskoka sites) as an example of a calcareous and non-calcareous groundwater system, respectively, to validate our reaction network. After approximately 10 years of wastewater infiltration, P is effectively attenuated within the first 10 m downgradient of the source mainly through fast sorption onto calcite and Fe oxides. Slow, kinetic sorption contributes further to P removal, while precipitation of phosphate minerals (strengite, hydroxyapatite) is quantitatively unimportant in the saturated zone. Nitrogen (N) dynamics are also considered, but nitrate behaves essentially as a conservative tracer in both systems. The model-predicted advancement of the P plume upon continued wastewater discharge at the calcareous site is in line with field observations. Model results suggest that, upon removal of the wastewater source, the P plume at both sites will persist for at least 20 years, owing to desorption of P from aquifer solids and the slow rate of P mineral precipitation. Sensitivity analyses for the noncalcareous scenario (Muskoka) illustrate the importance of the sorption capacity of the aquifer solids for P in modulating groundwater N:P ratios in oxic groundwater. The model simulations predict the breakthrough of groundwater with high P concentrations and low N:P ratios after 17 years at 20 m from the source for an aquifer with low sorption capacity (b 0.02% w/w Fe(OH) 3 ). In this type of system, denitrification plays a minor role in lowering the N:P ratios because it is limited by the availability of labile dissolved organic matter.

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Reactive transport controls on sandy acid sulfate soils and impacts on shallow groundwater quality

Salmon

Rate

Rengel

et al. 2014

Water Resources Research

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Disturbance or drainage of potential acid sulfate soils (PASS) can result in the release of acidity and degradation of infrastructure, water resources, and the environment. Soil processes affecting shallow groundwater quality have been investigated using a numerical code that integrates (bio)geochemical processes with water, solute, and gas transport. The patterns of severe and persistent acidification (pH < 4) in the sandy, carbonate-depleted podzols of a coastal plain could be reproduced without calibration, based on oxidation of microcrystalline pyrite after groundwater level decrease and/or residual groundwater acidity, due to slow vertical solute transport rates. The rate of acidification was limited by gas phase diffusion of oxygen and hence was sensitive to soil water retention properties and in some cases also to oxygen consumption by organic matter mineralization. Despite diffusion limitation, the rate of oxidation in sandy soils was rapid once pyrite-bearing horizons were exposed, even to a depth of 7.5 m. Groundwater level movement was thus identified as an important control on acidification, as well as the initial pyrite content. Increase in the rate of Fe(II) oxidation lead to slightly lower pH and greater accumulation of Fe(III) phases, but had little effect on the overall amount of pyrite oxidized. Aluminosilicate (kaolinite) dissolution had a small pH-buffering effect but lead to the release of Al and associated acidity. Simulated dewatering scenarios highlighted the potential of the model for risk assessment of (bio)geochemical impacts on soil and groundwater over a range of temporal and spatial scales.

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Cycling of iron and manganese in surface sediments; a general theory for the coupled transport and reaction of carbon, oxygen, nitrogen, sulfur, iron, and manganese

Cited by 534 publications

References 0 publications

Kinetics of microbial Fe(III) oxide reduction in freshwater wetland sediments

Kinetics of microbial Fe(III) oxide reduction in freshwater wetland sediments

Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

Reactive transport controls on sandy acid sulfate soils and impacts on shallow groundwater quality

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