Ionic strength and pH dependent multi-site sorption of Cs onto a micaceous aquifer sediment

Fuller, Adam J.; Shaw, Samuel; Peacock, Caroline L.; Trivedi, Divyesh; Small, Joe S.; Abrahamsen, L.; Burke, Ian T.

doi:10.1016/j.apgeochem.2013.10.017

Cited by 80 publications

(44 citation statements)

References 50 publications

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“…The cation exchange procedure with low-hydration (high attraction to the K + position) cations that can easily substitute interlayer K + , i.e. Cs + or Rb + (Wampler et al, 2012;Fuller et al 2014) may thus be suggested for the most complete potassium removal from the low-Ar retention sites. Such experiments could verify the results of this study.…”

Section: Conclusion and Implications For Ar-based Geochronologymentioning

confidence: 99%

“…laboratory cation exchange, that is supported by e.g. Cs + fixation in illite (Wampler et al, 2012;Fuller et al, 2014). Removal of potassium from the illite fringes is expected to be more difficult by common cation exchange procedures than from the surface of illite crystallites due to strong electrostatic forces retaining potassium in the site.…”

Section: Conclusion and Implications For Ar-based Geochronologymentioning

confidence: 99%

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Molecular modeling of the effects of 40Ar recoil in illite particles on their K–Ar isotope dating

Szczerba

Derkowski

Kalinichev

et al. 2015

Geochimica et Cosmochimica Acta

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Section: Conclusion and Implications For Ar-based Geochronologymentioning

confidence: 99%

Section: Conclusion and Implications For Ar-based Geochronologymentioning

confidence: 99%

Molecular modeling of the effects of 40Ar recoil in illite particles on their K–Ar isotope dating

Szczerba

Derkowski

Kalinichev

et al. 2015

Geochimica et Cosmochimica Acta

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“…For example, several studies have shown that solution chemistry strongly affects the kinetics of adsorption on slow sites [4] and desorption from high-affinity sites [25], perhaps through a mechanism analogous to the well known salinity-dependence of smectite clay swelling [86,45]. Geochemical models of cesium adsorption on illite almost invariably ignore the slow sites [14,91,35,33] or assume that their properties are identical to those of the basal sites [4] or the high-affinity sites [100]. The range of values of NaACs and KACs exchange selectivity coefficients used in surface complexation models is shown in Table 1.…”

Section: Introductionmentioning

confidence: 98%

Molecular dynamics simulations of cesium adsorption on illite nanoparticles

Lammers

Bourg

Okumura

et al. 2017

Journal of Colloid and Interface Science

124

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The charged surfaces of micaceous minerals, especially illite, regulate the mobility of the major radioisotopes of Cs (Cs, Cs,Cs) in the geosphere. Despite the long history of Cs adsorption studies, the nature of the illite surface sites remains incompletely understood. To address this problem, we present atomistic simulations of Cs competition with Na for three candidate illite adsorption sites - edge, basal plane, and interlayer. Our simulation results are broadly consistent with affinities and selectivities that have been inferred from surface complexation models. Cation exchange on the basal planes is thermodynamically ideal, but exchange on edge surfaces and within interlayers shows complex, thermodynamically non-ideal behavior. The basal planes are weakly Cs-selective, while edges and interlayers have much higher affinity for Cs. The dynamics of NaCs exchange are rapid for both cations on the basal planes, but considerably slower for Cs localized on edge surfaces. In addition to new insights into Cs adsorption and exchange with Na on illite, we report the development of a methodology capable of simulating fully-flexible clay mineral nanoparticles with stable edge surfaces using a well-tested interatomic potential model.

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“…The lowest 137 Cs activity occurred at station 6, which was the nearest to industrial waste effluent. The temperature, salinity, and pH of surface seawater in all stations were relatively consistent, indicating that these parameters did not affect the behavior of 137 Cs, especially since pH was unaffected [23]. Cs in sediment do not occur in a short time frame.…”

Section: Cs Activity In Seawater Samplesmentioning

confidence: 79%

Behavior of <sup>137</sup>Cs Activity in the Sayung Waters, Demak, Indonesia

2017

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The behavior of anthropogenic radionuclide 137 Cs in the water and sediment has been examined with regard to particle size, organic sediment, and other physical conditions in the Sayung estuarine waters of Demak. Previously, this estuary was used as shrimp culture brackish water ponds that were affected by serious erosion and intrusion. Furthermore, this regency rapidly industrialized over the last three decades. The activities of 137 Cs in the six stations in water and sediment were in the 0.0116-0.4509 mBq/L and 0.3747-1.2442 Bq/kg ranges with mean activities of 0.2278 mBq/L and 0.8594 Bq/kg, respectively, depending on the prevailing physicochemical regime at the sampling station. The highest activities of aqueous 137 Cs occurred in station 2 but the highest in sediment occurred in station 6 located closed to the main land of Sayung. Fast current effectively diluted 137 Cs as a conservative radionuclide in seawater, thus the activity of 137 Cs in seawater decreased when the current speed increased. This effect was caused in part by industrial pollutants that adsorbed 137 Cs and precipitated onto the surface sediment. Organic matters and clay materials in sediment were not significantly effective at binding 137 Cs in Sayung waters in the industrial coastal area, but the correlation increased in open areas separated by a breakwater (second group stations) and the location further from the beach or in open sea. This indicates that industrial pollutants are more effective at binding 137 Cs than organic matters and clay materials. Fine grain size sediment is also more ineffective at binding 137 Cs; it may be caused by the sediment's high total organic matter content.

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Ionic strength and pH dependent multi-site sorption of Cs onto a micaceous aquifer sediment

Cited by 80 publications

References 50 publications

Molecular modeling of the effects of 40Ar recoil in illite particles on their K–Ar isotope dating

Molecular modeling of the effects of 40Ar recoil in illite particles on their K–Ar isotope dating

Molecular dynamics simulations of cesium adsorption on illite nanoparticles

Behavior of <sup>137</sup>Cs Activity in the Sayung Waters, Demak, Indonesia

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