A Column Experiment for the Study of Colloidal Radionuclide Migration in Gorleben Aquifer Systems

Kim, J. I.; Delakowitz, Bernd; Zeh, P.; Klotz, D.; Lazik, D.

doi:10.1524/ract.1994.6667.s1.165

Cited by 10 publications

(18 citation statements)

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“…All of the experiments were performed in sand with different compositions. Inorganic species of europium were shown not to be eluted in quartz sand, as evidenced by Kim et al (1994) and Randall et al (1994). Europium was either complexed to the surface sites of sand or precipitated owing to the low solubility of the Eu and the high concentrations of the metal and pH (,7-8) used in the experiments.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

“…Rare earth elements have the same chemistry as americium, curium and plutonium in their trivalent state, with the advantage of being non-radioactive. As a consequence, REEs have been widely used as surrogates to investigate the transport of these actinides in soils (Randall et al 1994;Warwick et al 2000;Kim et al 1994). Trivalent REEs are also fission products of the nuclear cycle and are found in nuclear wastes that can be released accidentally to the environment.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

“…Several studies have focussed on the transport of Eu III in the Gorleben site (Lower Saxony, Germany), which was proposed by the German government to become a long-term repository for nuclear waste. The aquifer is rich in organic matter, composed mainly of humic and fulvic acids (Kim et al 1994). Kim et al (1994) focussed on understanding the mobility of trivalent europium associated with humic acid colloids.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

“…The aquifer is rich in organic matter, composed mainly of humic and fulvic acids (Kim et al 1994). Kim et al (1994) focussed on understanding the mobility of trivalent europium associated with humic acid colloids. Laboratory column experiments were performed under anaerobic conditions using sand collected at the Gorleben site together with groundwater collected under the same anaerobic conditions.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

“…Therefore, the recovery of Eu was very low (11 %), which indicated that Eu ions have a high affinity to sand. Kim et al (1994) reported that 98 % of Eu was bound to the humic acids. The different observations of the two studies can be explained by the speciation of Eu in solution.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

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Current knowledge on transport and reactivity of technology-critical elements (TCEs) in soil and aquifer environments

2020

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Environmental contextTechnology-critical elements, widely used in modern industry, are found in the environment as a result of both anthropogenic usage and natural sources. This review describes current knowledge on the transport of technology-critical elements in sand, soils and aquifer environments. The chemical compositions of the soils and groundwaters influence the transport of technology-critical elements, and natural colloids increase their mobility. AbstractTechnology-critical elements (TCEs) are now present in soil and aquifer environments, as a result not only of the geogenic origin but also of the recent anthropogenic activities and release. TCEs can interact with all components of the soil and water, which include inorganic and organic ligands (natural organic matter), clays, mineral surfaces and microorganisms. The literature regarding the transport and fate of TCEs in subsurface porous media (e.g. soil and aquifers) is limited and highly diverse. This review offers a detailed analysis of the existing literature on the transport and fate of TCEs in porous media, and emphasises what is still needed to fully understand their behaviour in the environment. Different modes of TCE transport are presented. First, the mobility of TCEs following interaction with colloids (e.g. natural organic matter, clays) is described. For these cases, an increase in the ionic strength and pH of aqueous solutions shows stronger retention or sorption of TCEs on porous matrices. The transport of nanoparticles (NPs) that contain TCEs is presented as a second mode of mobility. The ionic strength of the solution is the key parameter that controls the transport of cerium nanoparticles in porous media; natural organic matter also increases the mobility of nanoparticles. The third part of this review describes sorption and dissolution processes during transport. Finally, results from the field experiments are reported, which show that rare earth elements and indium are transported in the presence of natural organic matter. We conclude this review with suggested directions for future research.

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Section: Rare Earth Elementsmentioning

confidence: 99%

Section: Rare Earth Elementsmentioning

confidence: 99%

Section: Rare Earth Elementsmentioning

confidence: 99%

Section: Rare Earth Elementsmentioning

confidence: 99%

Section: Rare Earth Elementsmentioning

confidence: 99%

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Current knowledge on transport and reactivity of technology-critical elements (TCEs) in soil and aquifer environments

2020

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A Kinetic Study of Am(III)/Humic Colloid Interactions

Artinger

Schuessler

Schaefer

et al. 2002

Environ. Sci. Technol.

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The interaction kinetics of the Am(III) ion with aquatic humic colloids is investigated under near-natural conditions by column experiments with a sandy aquifer sample rich in humic substancesforthe appraisal of the migration behavior of Am. The association and dissociation kinetics of the Am ion onto and from humic colloids control the migration of colloid-borne Am. As the contact time between Am and humic colloids prior to introduction into a column is increased, the mobility of colloid-borne Am is enhanced and hence the recovery of Am in the effluent increases. On the other hand, an increase of the migration time and residence time in column, respectively, reduces the Am recovery. Considering these experimental results a refined version of the kinetic model KICAM (Kinetically Controlled Availability Model), which suggests different Am binding modes with humic colloids, was developed. Applying KICAM it is possible to predict static and dynamic experiments affected by the kinetically controlled Am/humic colloid interactions over the range of 1 h up to several months. However, to apply these experimental results to long-term conditions, the Am binding scheme as proposed in KICAM needs to be verified. This paper provides, therefore, a basis for a better understanding of the colloid-borne Am migration in porous aquifer systems.

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Influence of Addition Order and Contact Time on Thorium(IV) Retention by Hematite in the Presence of Humic Acids

Reiller¹,

Casanova²,

Moulin

2005

Environ. Sci. Technol.

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The influence of addition order and contact time in the system hematite (α-Fe 2 O 3 ) -humic acid (HA) -thorium (IV) was studied in batch experiments. Thorium (IV) is considered here as a chemical analogue of other actinides (IV). The sorption isotherms were acquired varying pH in the range 2-10, and HA concentration in the range 1-100 mg/L. As already observed by numerous authors, thorium (IV) retention was hindered when HA and hematite were equilibrated beforehand during 24 hours. As it has been observed in a previous study, this 2 effect was drastic when the ratio between humic and surface (iron oxide) sites exceeds a critical value. However, when HA were added after a 24 hours equilibration of the hematitethorium (IV) system, thorium (IV) was barely desorbed from the iron oxide surface.Furthermore, no drastic effect of the ratio between humic and surface sites could be evidenced, as the increase of HA concentration only results in a slight monotonic decrease in Th(IV) retention. Increasing contact time between components of the systems only indicated slight Th(IV) retention variation. This was interpreted as a consequence of slow kinetic controls of both the Th(IV)-HA complexation and HA-hematite sorption.

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A Column Experiment for the Study of Colloidal Radionuclide Migration in Gorleben Aquifer Systems

Cited by 10 publications

References 0 publications

Current knowledge on transport and reactivity of technology-critical elements (TCEs) in soil and aquifer environments

Current knowledge on transport and reactivity of technology-critical elements (TCEs) in soil and aquifer environments

A Kinetic Study of Am(III)/Humic Colloid Interactions

Influence of Addition Order and Contact Time on Thorium(IV) Retention by Hematite in the Presence of Humic Acids

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