Proton and Trivalent Metal Cation Binding by Dissolved Organic Matter in the Opalinus Clay and the Callovo-Oxfordian Formation

Courdouan, Amandine; Christl, Iso; Rabung, Thomas; Wersin, Paul; Kretzschmar, Ruben

doi:10.1021/es8007358

Cited by 18 publications

(9 citation statements)

References 23 publications

(39 reference statements)

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“…The remaining fraction for Ni and Zn mainly consist of carbonate species (ZnHCO 3 + and NiHCO 3 + ). These results are consistent with the high content of CaCO 3 in the soil and the alkaline pH (Courdouan et al, 2008;Unsworth et al, 2006).…”

Section: Metal Speciation In the Soil Solutionsupporting

confidence: 85%

Evaluation of the impact of organic matter composition on metal speciation in calcareous soil solution: Comparison of Model VI and NICA-Donnan

Ponthieu

Pourret

Marin

et al. 2016

Journal of Geochemical Exploration

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Section: Metal Speciation In the Soil Solutionsupporting

confidence: 85%

Evaluation of the impact of organic matter composition on metal speciation in calcareous soil solution: Comparison of Model VI and NICA-Donnan

Ponthieu

Pourret

Marin

et al. 2016

Journal of Geochemical Exploration

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“…Ratios of dissolved and bound HSs in deep underground environments are different from site to site, and they may have rather different properties even in a given geological setting. 30 The uniqueness of deep underground HSs has been pointed out by several researchers. 21,[23][24][25][26]29,31,32 Schäfer et al 23 studied possible sources of FAs in the Gorleben aquifer, based on isotopic data and C and S X-ray absorption near-edge spectroscopy (XANES).…”

Section: Introductionmentioning

confidence: 99%

Physicochemical and ion-binding properties of highly aliphatic humic substances extracted from deep sedimentary groundwater

Saito

Terashima²,

Aoyagi

et al. 2015

Environ. Sci.: Processes Impacts

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Humic substances (HSs) are ubiquitous in various aquatic systems and play important roles in many geochemical processes. There is increasing evidence of the presence of HSs in deep groundwater; nevertheless, their ion binding properties are largely unknown. In this study we investigated the physicochemical and ion-binding properties of humic and fulvic acids extracted from deep sedimentary groundwater. The binding isotherms of protons (H(+)) and copper (Cu(2+)) were measured by potentiometry and fitted to the NICA-Donnan model, and the obtained parameters were compared with the generic parameters of the model, which are the average parameters for HSs from surface environments. The deep groundwater HSs were different from surface HSs, having high aliphaticities, high sulfur contents, and small molecular sizes. Their amounts of acidic functional groups were comparable to or slightly larger than those of surface HSs; however, the magnitude of Cu(2+) binding to the deep groundwater HSs was smaller. The NICA-Donnan model attributed this to the binding of Cu(2+) to chemically homogeneous low affinity sites, which presumably consist of carboxylic groups, via mono-dentate coordination at relatively low pH. The binding mode tended to shift to multi-dentate coordination with carboxylic groups and more heterogeneous alcoholic/phenolic groups at higher pH. X-ray absorption spectroscopy also revealed that Cu(2+) binds to O/N containing functional groups and to a lesser extent S containing functional groups as its divalent from. This study shows the particularity of the deep groundwater HSs in terms of their physicochemical and ion-binding properties, compared with surface HSs.

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“…Opalinus Clay contains organic matter (*1.5% w/w (Courdouan et al 2007 andCourdouan-Metz 2008)) and this carbon could serve potentially as a carbon source and/or electron donor to microorganisms. However, the fact that this organic carbon is present in the rock may indicate that microbes either: (a) are not present in undisturbed Opalinus Clay, (b) are present but not active due to lack of space and available water, or (c) are present but not active due to the inaccessible and/or recalcitrant nature of the organic matter available.…”

Section: General Factors Restricting Microbial Activity In Opalinus Claymentioning

confidence: 99%

Fifteen years of microbiological investigation in Opalinus Clay at the Mont Terri rock laboratory (Switzerland)

et al. 2017

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Microbiological studies related to the geological disposal of radioactive waste have been conducted at the Mont Terri rock laboratory in Opalinus Clay, a potential host rock for a deep geologic repository, since 2002. The metabolic potential of microorganisms and their response to excavation-induced effects have been investigated in undisturbed and disturbed claystone cores and in pore-(borehole) water. Results from nearly 15 years of research at the Mont Terri rock laboratory have shown that microorganisms can potentially affect the environment of a repository by influencing redox conditions, metal corrosion and gas production and consumption under favourable conditions. However, the activity of microorganisms in undisturbed Opalinus Clay is limited by the very low porosity, the low water activity, and the largely recalcitrant nature of organic matter in the claystone formation. The presence of microorganisms in numerous experiments at the Mont Terri rock laboratory has suggested that excavation activities and perturbation of the host rock combined with additional contamination during the installation of experiments in boreholes create favourable conditions for microbial activity by providing increased space, water and substrates. Thus effects resulting from microbial activity might be expected in the proximity of a geological repository i.e., in the excavation damaged zone, the engineered barriers, and first containments (the containers).

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Proton and Trivalent Metal Cation Binding by Dissolved Organic Matter in the Opalinus Clay and the Callovo-Oxfordian Formation

Cited by 18 publications

References 23 publications

Evaluation of the impact of organic matter composition on metal speciation in calcareous soil solution: Comparison of Model VI and NICA-Donnan

Evaluation of the impact of organic matter composition on metal speciation in calcareous soil solution: Comparison of Model VI and NICA-Donnan

Physicochemical and ion-binding properties of highly aliphatic humic substances extracted from deep sedimentary groundwater

Fifteen years of microbiological investigation in Opalinus Clay at the Mont Terri rock laboratory (Switzerland)

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