Experimental data and assessment of predictive modeling for radium ion-exchange on beidellite, a swelling clay mineral with a tetrahedral charge

Robin, Valentin; Tertre, Emmanuel; Beaucaire, Catherine; Regnault, Olivier; Descostes, Michaël

doi:10.1016/j.apgeochem.2017.07.009

Cited by 34 publications

(33 citation statements)

References 37 publications

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“…Their micromorphology and spatial distribution, localized mainly in the porosity of sandstone, allow them to be also involved in the regulation of the water chemistry. Indeed, they exhibit signifi cant cationic sorption properties (Robin et al 2015b(Robin et al , 2017 and low solubility in acidic conditions (Robin et al 2016). During the acidifi cation stage, smectite minerals occurring in the porosity sorb protons (Fig.…”

Section: Geochemical Mechanisms Involved In Post Acidic Isr Miningmentioning

confidence: 99%

“…Such trend can only be simulated if sorption is considered on clay minerals (de Boissezon et al 2017). Finally, sorption, in these physico-chemical conditions, is also a key mechanism governing the mobility of U, 226 Ra and other metals (Reinoso-Maset and Ly 2016; Robin et al 2017).…”

Section: Geochemical Mechanisms Involved In Post Acidic Isr Miningmentioning

confidence: 99%

“…Through its specifi c activity and its relatively long half-life (1620 y), 226 Ra must be considered as ultra-trace element with typical concentrations in the range of ppb to ppt. Therefore, its mobility in natural context is principally governed by sorption at the surface of ancillary minerals, natural organic matter and coprecipitation in SO 4 -bearing minerals (see among others references dedicated to the mobility of 226 Ra in mining context: Lestini et al 2013;Sajih et al 2014;Reinoso-Maset and Ly 2016;Robin et al 2017;Bordelet et al 2018, Lestini et al 2019. No proper Ra mineral phase has ever been found in natural environments.…”

Section: Main Geochemical Mechanisms Involved In Environmental Impactmentioning

confidence: 99%

“…X H arbitrarily stand for 226 Ra 2+ and H + sorbed at the surface of smectite type minerals (seeRobin et al 2017 for more details).…”

mentioning

confidence: 99%

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Industrial Deployment of Reactive Transport Simulation: An Application to Uranium In situ Recovery

Lagneau

Regnault

Descostes

2019

Reviews in Mineralogy and Geochemistry

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Section: Geochemical Mechanisms Involved In Post Acidic Isr Miningmentioning

confidence: 99%

Section: Geochemical Mechanisms Involved In Post Acidic Isr Miningmentioning

confidence: 99%

Section: Main Geochemical Mechanisms Involved In Environmental Impactmentioning

confidence: 99%

“…X H arbitrarily stand for 226 Ra 2+ and H + sorbed at the surface of smectite type minerals (seeRobin et al 2017 for more details).…”

mentioning

confidence: 99%

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Industrial Deployment of Reactive Transport Simulation: An Application to Uranium In situ Recovery

Lagneau

Regnault

Descostes

2019

Reviews in Mineralogy and Geochemistry

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“…Such variations could be explained by the activity of sulphate reducing bacteria (SRB) known to favour the reduction of sulphate concurrently to the oxidation of organic carbon (higher values observed in the mineralized and reduced parts of the aquifer, up to 3.67 mg/L for MOZO_0007) into carbonate and sulphide according to the overall simplified reaction, where redox conditions are here controlled by the solubility of ferric hydroxide (Fe(OH) 3 (s)) and pyrite (FeS 2 (s)), respectively, upstream and downstream the roll-front. 4 and, on the other hand, the affinity of cations towards clay minerals through sorption processes [27][28][29]. Concentrations of major anions (Cl, SO 4 ) are therefore also varying in the same way with respect to the electrical balance.…”

Section: Water Chemistrymentioning

confidence: 99%

Resident bacterial populations mediating biogeochemical dynamics in a Uranium roll front deposit

Jrou

Descostes

Povedano-Priego

et al. 2019

Preprint

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Background Uranium-mineralized sandy aquifer, planned for a mining by in situ recovery (U ISR), harbors a reservoir of bacterial life that may influence the biogeochemical cycles surrounding the Uranium roll front deposits. Since microorganisms are likely to play an important role at all stages of U ISR, a better knowledge of the resident bacteria before any ISR actuations is essential to face environmental quality assessment. The focus here was made on the characterization of the resident microbiome of an aquifer surrounding uranium roll-front deposit that is part of an ISR facility project at Zoovch Ovoo (Mongolia). Water samples were collected following the natural redox zonation inherited in the aquifer, including the native mineralized orebody, and both the upstream and downstream compartments.Results An imposed chemical zonation for all sensitive redox elements through the roll-front system was observed in all water samples. High-throughput sequencing showed that the bacterial community structure was shaped by the redox gradient and the oxygen availability. Several interesting bacteria were observed including sulphate-reducing (e.g. Desulfovibrio, Nitrospira), iron-reducing (e.g. Gallionella, Sideroxydans) iron-oxidizing (e.g. Rhodobacter, Albidiferax, Ferribacterium), and nitrate-reducing bacteria (e.g. Pseudomonas, Aquabacterium), which may be also involved in metal reduction (e.g. Desulfovibrio, Ferribacterium, Pseudomonas, Albidiferax, Caulobacter, Zooglea). The taxa residing in each aquifer compartment followed a strong redox zonation differentiation, although as a whole the population of each water section seems to define an ecologically functional ecosystem containing suitable microorganisms that are probably prone to promote the remediation of the acidified aquifer by natural attenuation. Co-occurrence patterns confirmed a strong correlations among the bacterial genera suggesting either a shared and preferred environmental conditions or the performance of functions similar or complementary to each other.Conclusions Assessing the composition, and structure of the resident bacterial communities is a prerequisite for understanding the natural attenuation and predicting bacterial input in the improvement of ISR efficiency.

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Use of major ions to evaluate groundwater chemistry and identify hydrochemical processes in a shallow coastal aquifer in southeast Brazil

Filho¹,

Bomtempo²,

Cota³

et al. 2022

Environ Earth Sci

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Coastal aquifers of southeastern Brazil have a fundamental role in economic and social terms, as it is a densely populated region with intense economic activity. The present research was carried out in the coastal region of the State of Rio de Janeiro and enclosed the Brazilian Nuclear Power Plants (NPP) site. The study aimed to assess the hydrochemistry of the shallow aquifer at the NPP's site and surroundings. The hydrochemical study was carried out based on data from twelve water samples, collected in October 2018, in which the following parameters, among others, were measured: electrical conductivity, total dissolved solids, temperature, and pH were measured in situ. The analytical determinations carried out were as follows: alkalinity (titration); Ca 2+ and Mg 2+ , (atomic absorption/spectrometry); Na + and K + (liquid chromatography); Cland SO 4 2+ (liquid chromatography), and; silicon (inductively coupled plasma mass spectrometry). Using Piper and Chadha diagrams, the research identi ed four water types: Group 1 (Ca 2+ -Na + -HCO 3 -),Group 2 (Ca 2+ -HCO 3 -), Group 3 (Ca 2+ (Na + rich)-HCO 3 -), and Group 4 (Na + -Cl -). From the hillsides towards the beach line, the research results suggest a hydrochemical evolution of local groundwater from Group 1 (high rainwater in uence), passing through Group 3 (intermediate between Group 1 and 2) and Group 2 (rock in uence), to Group 4 (seawater like). The waters of groups 1 to 3 showed potential for base cation exchange (softening or freshening process), while, in Group 4, the potential is for reverse cation exchange (hardening or salinizing process). In a general hydrogeology context, the methods and applied techniques proved to be particularly e cient in identifying potential hydrochemical processes. Noteworthy is the freshening cation exchange identi ed in the shallow aquifer at NPP's site. Therefore, theoretically, in case of an accidental release of radionuclides from the NPP to the aqueous phase, the local clay lenses can capture the divalent cation Ra 2+ in a natural contamination attenuation process.

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Experimental data and assessment of predictive modeling for radium ion-exchange on beidellite, a swelling clay mineral with a tetrahedral charge

Cited by 34 publications

References 37 publications

Industrial Deployment of Reactive Transport Simulation: An Application to Uranium In situ Recovery

Industrial Deployment of Reactive Transport Simulation: An Application to Uranium In situ Recovery

Resident bacterial populations mediating biogeochemical dynamics in a Uranium roll front deposit

Use of major ions to evaluate groundwater chemistry and identify hydrochemical processes in a shallow coastal aquifer in southeast Brazil

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