An EXAFS study on the effects of natural organic matter and the expandability of clay minerals on cesium adsorption and mobility

Fan, Qiao; Tanaka, Masato; Tanaka, Kohei; Sakaguchi, Aya; Takahashi, Yoshio

doi:10.1016/j.gca.2014.02.049

Cited by 169 publications

(118 citation statements)

References 56 publications

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“…It is widely accepted that radiocesium is adsorbed onto frayed edge sites and interlayer sites of clay minerals, which have a selective affinity for Cs, and are found in soils and sediments (Cremers et al, 1988). It has been shown that Cs is strongly fixed at interlayer sites in clay minerals from the formation of an inner-sphere complex from studies on extended X-ray absorption fine structure (Bostick et al, 2002;Qin et al, 2012;Fan et al, 2014a). Our XRD patterns indicate that clay minerals were present in the fine particle size fractions (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 55%

“…Previous studies have demonstrated that organic matter blocks the access of Cs to frayed edge sites and interlayer sites of clay minerals (Rigol et al, 1998;Fan et al, 2014a;Suga et al, 2014), thus preventing its fixation in clay minerals. Bellenger and Staunton (2008) indicated that a coating of Fe oxides had less effect than organic coatings.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Nesbitt et al (1980) suggested that the fractionation consisted of two steps: the release of alkali element ions and their subsequent fixation by weathering products (i.e., clay minerals). It is well known that, of the alkali elements, Cs is fixed most tightly because of its strong adsorption on clay minerals (Bostick et al, 2002;Qin et al, 2012;Fan et al, 2014a). Once Cs is leached from fresh primary minerals, it can be fixed once again on the weathering products of clay minerals.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Size distribution of alkali elements in riverbed sediment and its relevance to fractionation of alkali elements during chemical weathering

Tanaka

Watanabe

2015

Chemical Geology

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Section: Accepted Manuscriptmentioning

confidence: 55%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Size distribution of alkali elements in riverbed sediment and its relevance to fractionation of alkali elements during chemical weathering

Tanaka

Watanabe

2015

Chemical Geology

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“…In the case of Cs, 2-3 times higher concentrations in the soil water led to 4-5 times higher concentrations in biota. Since Cs is considered to have low affinity for organic matter, the elevated concentrations are probably not directly linked to TOC (Fan et al, 2014). Instead, factors such as lower amount of mineral surfaces and lower pH could allow higher concentrations of more bioavailable Cs ions in the riparian soil water, leading to elevated concentrations in biota.…”

Section: F Lidman Et Al: From Soil Water To Surface Watermentioning

confidence: 99%

From soil water to surface water – how the riparian zone controls element transport from a boreal forest to a stream

et al. 2017

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Abstract. Boreal headwaters are often lined by strips of highly organic soils, which are the last terrestrial environment to leave an imprint on discharging groundwater before it enters a stream. Because these riparian soils are so different from the Podzol soils that dominate much of the boreal landscape, they are known to have a major impact on the biogeochemistry of important elements such as C, N, P and Fe and the transfer of these elements from terrestrial to aquatic ecosystems. For most elements, however, the role of the riparian zone has remained unclear, although it should be expected that the mobility of many elements is affected by changes in, for example, pH, redox potential and concentration of organic carbon as they are transported through the riparian zone. Therefore, soil water and groundwater was sampled at different depths along a 22 m hillslope transect in the Krycklan catchment in northern Sweden using soil lysimeters and analysed for a large number of major and trace elements (Al, As, B, Ba, Ca, Cd, Cl, Co, Cr, Cs, Cu, Fe, K, La, Li, Mg, Mn, Na, Ni, Pb, Rb, Se, Si, Sr, Th, Ti, U, V, Zn, Zr) and other parameters such as sulfate and total organic carbon (TOC). The results showed that the concentrations of most investigated elements increased substantially (up to 60 times) as the water flowed from the uphill mineral soils and into the riparian zone, largely as a result of higher TOC concentrations. The stream water concentrations of these elements were typically somewhat lower than in the riparian zone, but still considerably higher than in the uphill mineral soils, which suggests that riparian soils have a decisive impact on the water quality of boreal streams. The degree of enrichment in the riparian zone for different elements could be linked to the affinity for organic matter, indicating that the pattern with strongly elevated concentrations in riparian soils is typical for organophilic substances. One likely explanation is that the solubility of many organophilic elements increases as a result of the higher concentrations of TOC in the riparian zone. Elements with low or modest affinity for organic matter (e.g. Na, Cl, K, Mg and Ca) occurred in similar or lower concentrations in the riparian zone. Despite the elevated concentrations of many elements in riparian soil water and groundwater, no increase in the concentrations in biota could be observed (bilberry leaves and spruce shoots).

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“…This finding provided evidence related to the significant contribution of clay minerals or micas to Cs retention in soils from Fukushima Prefecture. Fan et al (2014) investigated the cesium adsorption to clay minerals (illite, montmorillonite, and vermiculite) using sequential extraction, batch sorption, x-ray diffraction, and EXAFS analysis with molecular simulations. The inner sphere complex of dehydrated Cs + mainly formed at the frayed edge site and interlayer site on illite (non-expansion) without producing any illite structural changes.…”

Section: Exafs Analysismentioning

confidence: 99%

Radionuclides Released from Nuclear Accidents: Distribution and Dynamics in Soil

Nagao

2016

Environmental Remediation Technologies for Metal-Contaminated Soils

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The Chernobyl nuclear power plant accident in 1986, the Mayak reprocessing plant accident in 1957, and the Fukushima nuclear power plant accident in 2011 have released various radionuclides. Spatial distribution of radionuclides in surface soil constitutes fundamental information related to radiation exposure and to post-accident sources for secondary dispersion of radionuclides. The spatial and vertical distributions of 137 Cs, 90 Sr, and Pu from those three nuclear accidents were reviewed to elucidate the fate of the radionuclides in the soil environment. This chapter specifically presents information about the dynamics of radiocesium ( 134 Cs and 137 Cs) in the soil of contaminated areas because of its long half-life and its major contribution to the overall external radiation dose. Along with an examination of global fallout, for soils of various types, the existence forms and geochemical behavior of radiocesium in surface soil after the Fukushima accident are reviewed, as are similar results from the Chernobyl and Mayak nuclear accidents.

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An EXAFS study on the effects of natural organic matter and the expandability of clay minerals on cesium adsorption and mobility

Cited by 169 publications

References 56 publications

Size distribution of alkali elements in riverbed sediment and its relevance to fractionation of alkali elements during chemical weathering

Size distribution of alkali elements in riverbed sediment and its relevance to fractionation of alkali elements during chemical weathering

From soil water to surface water – how the riparian zone controls element transport from a boreal forest to a stream

Radionuclides Released from Nuclear Accidents: Distribution and Dynamics in Soil

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