Oxidation capacity of aquifer sediments

Heron, Gorm; Christensen, Thomas Højlund; Tjell, Jens Christian

doi:10.1021/es00050a021

Cited by 111 publications

(62 citation statements)

References 21 publications

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“…These previous authors proposed calculation of a parameter, total reducing capacity (TRC), as the number of electrons that can be provided by the reduced component of a milieu. Similarly, Heron et al (1994) calculated an oxidation capacity (OXC) taking into account the oxygen, nitrate, iron, manganese and sulfates available as the main electron acceptors. This oxidation capacity corresponds to the quantity of electrons that can be accepted by a milieu.…”

Section: Soil Eh and Ph At The Field Scalementioning

confidence: 99%

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

2012

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Background Oxidation-reduction and acid-base reactions are essential for the maintenance of all living organisms. However, redox potential (Eh) has received little attention in agronomy, unlike pH, which is regarded as a master variable. Agronomists are probably depriving themselves of a key factor in crop and soil science which could be a useful integrative tool. Scope This paper reviews the existing literature on Eh in various disciplines connected to agronomy, whether associated or not with pH, and then integrates this knowledge within a composite framework. Conclusions This transdisciplinary review offers evidence that Eh and pH are respectively and jointly major drivers of soil/plant/microorganism systems. Information on the roles of Eh and pH in plant and microorganism physiology and in soil genesis converges to form an operational framework for further studies of soil/plant/microorganism functioning. This framework is based on the hypothesis that plants physiologically function within a specific internal Eh-pH range and that, along with microorganisms, they alter Eh and pH in the rhizosphere to ensure homeostasis at the cell level. This new perspective could help in bridging several disciplines related to agronomy, and across micro and macro-scales. It should help to improve cropping systems design and management, in conventional, organic, and conservation agriculture.

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Section: Soil Eh and Ph At The Field Scalementioning

confidence: 99%

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

2012

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“…Prior fixation experiments were conducted for two months; then uranium remobilization occurred for 14 hours through addition of defined amounts of additives: pyrite (1g, two were motivated by literature data from Ford [43] and Heron et al [44] …”

Section: Remobilization Experiments With Pyrite Edta Hcl Ticl 3 Anmentioning

confidence: 99%

Mechanism of uranium removal from the aqueous solution by elemental iron

Noubactep¹,

Schöner

Meinrath

2006

Journal of Hazardous Materials

120

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The effectiveness of elemental iron (Fe 0 ) to remove uranium (U) from the aqueous phase has been demonstrated. While the mitigation effect is sure, discrepancies in the removal mechanism have been reported. The objective of this study was to investigate the mechanism of U(VI) removal from aqueous phases by Fe 0 . For this purpose a systematic sequence of bulk experiments was conducted to characterize the effects of the availability and the abundance of corrosion products on U(VI) removal. Results indicated that U(VI) removal reactions did not primary occur at the surface of the metallic iron. It is determined that U(VI) co-precipitation with aging corrosion products is a plausible explanation for the irreversible fixation under experimental conditions. Results of XRD analyses did no show any U phases, whereas SEM-EDX analyses showed that U tended to associate with rusted areas on the surface of Fe 0 .Recovering U with different leaching solutions varied upon the dissolution capacity of the individual solutions for corrosion products, showing that the irreversibility of the removal 2 depends on the stability of the corrosion products. U(VI) co-precipitation as removal mechanism enables a better discussion of reported discrepancies.

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“…HERON, 1994a) to determine the distribution of the redox species in the matrix. In most cases, however, only water samples are available which integrate over a larger area of the aquifer.…”

Section: 6mentioning

confidence: 99%

“…Aerobic conditions are the best requirements for fast BTX degradation similar to the microbial catalysed oxidation of other organic substances. In the anaerobic environment the Fe(III) solid phases are considered as the most important electron acceptors and, besides, the natural oxidation capacity of an aquifer is due to the Fe(III) content (HERON et al, 1994a).…”

Section: Degradation Of Btx In the Underground Of A Former Gas Plantmentioning

confidence: 99%

“…The used extraction methods (modified from HERON et al, 1994a) by employing several aggressive extractants resulted not only in total Fe(II) and Fe(III) concentrations, but the iron content can be allocated to the nominal binding forms of low crystalline and crystalline Fe(III), monosulfidic, pyritic and carbonatic/phosphatic bounded Fe(II). Moreover, the sulfur content may be divided in the formal binding forms acid volatile sulfur (AVS, mainly FeS-sulfur) pyrite sulfur and the total sulfur content without the pyrite fraction.…”

Section: Degradation Of Btx In the Underground Of A Former Gas Plantmentioning

confidence: 99%

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