Cesium and rubidium ion equilibriums in illite clay

Brouwer, E.; Baeyens, Bart; Maes, André; Cremers, Adrien

doi:10.1021/j100230a024

Cited by 292 publications

(208 citation statements)

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“…So far, some experimental measurements have revealed that mica has three types of adsorption sites for Cs. 12,13) They are called types I, II, and III. Among these three types, the type I and II sites show low cation exchange capacity compared with that of type III, while their selectivity and retention stability for Cs is quite high compared with these of type III.…”

Section: Ccse Japan Atomic Energy Agency Kashiwa Chiba 277-8587 Jmentioning

confidence: 99%

“…4) The atomic scale structure of the type I and II sites was suggested to be related to the FES, 12,13) while the type III site is considered to be ubiquitously spread on nonspecific edges and wide planar surfaces whose affinity to Cs is not selective and irreversible. 12,13) These ideas are based on the results of batch experiments, although no direct atomic scale confirmation has been reported. On the basis of the FES image in Fig.…”

Section: Ccse Japan Atomic Energy Agency Kashiwa Chiba 277-8587 Jmentioning

confidence: 99%

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Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

2013

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Section: Ccse Japan Atomic Energy Agency Kashiwa Chiba 277-8587 Jmentioning

confidence: 99%

Section: Ccse Japan Atomic Energy Agency Kashiwa Chiba 277-8587 Jmentioning

confidence: 99%

Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

2013

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“…Once inside the clay interlayer, the cesium loses its water of hydration allowing the illite to collapse and form a more stable structure (Sawhney, 1972). Studies of cesium sorption by illite suggest that frayed edges and interlayers retain cesium with a high degree of selectivity (Brouwer et al, 1983). These "superselective" sites comprise only a small fraction of the clay's total cation exchange capacity, but the solid-liquid distribution coefficient is so large that cesium sorbed at these sites is effectively immobilized (Cremers et al, 1988).…”

Section: Episodic Sediment Depositionmentioning

confidence: 99%

Episodic deposition and 137Cs immobility in Skan Bay sediments: A ten-year 210Pb and 137Cs time series

1994

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Sugai, S.F., Alperin, M.J. and Reeburgh, W.S., 1994. Episodic deposition and 137Cs immobility in Skan Bay sediments: A ten-year 2X°pb and 13~Cs time series. In: M.I. Scranton (Editor), Variability in Anoxic Systems. Mar. Geol., A geochronology time series provides a powerful tool for elucidating sedimentary processes such as episodic deposition and diffusive mobility of particle-reactive constituents. Depth distributions of 21°Pb and 137Cs from Skan Bay, Alaska were determined for sediment cores collected in 1980, 1984, 1987, and 1990. Sediment X-radiographs reveal distinct layers indicating that sediments were not continuously mixed by bioturbation. However, the geochronology time series is inconsistent with an undisturbed, steady-state sediment column. Profiles from 1980Profiles from , 1984Profiles from , and 1990 reveal subsurface regions in which 21°pb activity is relatively constant. In addition, the depth of the primary 137Cs maximum (reflecting the 1963 peak in atmospheric bomb testing) does not increase in a regular fashion between 1980 and 1990. The 21°pb and 137Cs geochronologies can be reconciled by removing the effects of an instantaneous depositional event. The average 2X°pb sedimentation rate (corrected for episodic deposition) in cores that were collected over a ten year period (0.241 +0.006 g cm -2 yr-1) is in excellent agreement with the average 137Cs sedimentation rate (0.258 _+ 0.008 gcm-2 yr-1) calculated from three stratigraphic markers [peak fallout (1963), first appearance in the sediment record (1952), and the Chernobyl accident (1986)]. The mobility of bomb-derived 13VCs under in situ conditions was evaluated by a time-dependent numerical model applied to the 137Cs time series. The model indicates that bomb-derived cesium is immobile in Skan Bay sediments with a solid-liquid distribution coefficient (Kd) of/> 105 (ml g-1).

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“…It is well known that caesium is strongly adsorbed on clay minerals (Sawhney, 1972;Maes & Cremers, 1986;Cornell, 1993). This adsorption is highly speci"c, particularly on illitic materials which are thought to contain a small proportion of sites, frayed edge sites (FES), which have a very strong a$nity for caesium (Brouwer, Baeyens, Maes & Cremers, 1983). In contrast, the adsorption of caesium on organic matter is non-speci"c, and depends on the cation exchange capacity (CEC) of the organic matter and the relative proportions of caesium and other cations present.…”

Section: Introductionmentioning

confidence: 99%

Reduced adsorption of caesium on clay minerals caused by various humic substances

Dumat

Staunton

1999

Journal of Environmental Radioactivity

111

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The e!ect of the addition of various humic substances on the adsorption of caesium on two mineral clays has been studied. All measurements were carried out in dilute suspension under controlled conditions of temperature and ionic strength. Only a small proportion of the humic substance was adsorbed on the clays ( (10%). In general, the a$nity of the clay}humic complexes for caesium was less than that of the bare clay. The decrease was greater for illite than for montmorillonite, and greatest at trace concentrations of caesium and increased with increasing concentration of each humic substance. However, no correlation was found between the amount of humic substance adsorbed and the decrease in Cs adsorption when all complexes were considered. Neither size nor the origin of the humic substances could explain the extent of the adsorption decrease. Since neither steric hindrance nor decrease in the number of adsorption sites was the driving force behind this phenomenon, it is hypothesized that the a$nity of the clay surface is modi"ed by the organic macromolecules. The highly selective frayed edge sites of illite are particularly sensitive to the adsorption of polyanions because of their proximity to anion adsorption sites. The observed decrease in Cs adsorption may contribute to the unexpectedly high bioavailability of Cs in organic soils.

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Cesium and rubidium ion equilibriums in illite clay

Cited by 292 publications

References 1 publication

Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

Episodic deposition and 137Cs immobility in Skan Bay sediments: A ten-year 210Pb and 137Cs time series

Reduced adsorption of caesium on clay minerals caused by various humic substances

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