Role of soil organic matter in the mobility of radiocesium in agricultural soils common in Japan

Nakamaru, Yasuo; Ishikawa, Nao; Tagami, Keiko; Uchida, Shunsuke

doi:10.1016/j.colsurfa.2007.01.014

Cited by 49 publications

(26 citation statements)

References 16 publications

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“…The adsorption of cesium in soils decreases as the amount of soil organic matter increases, which implies that cesium is more available to biological systems in soils with high organic matter contents [40,41]. This hypothesis is somewhat supported from the lowest adsorption ratio of cesium in the leaf-mold soil.…”

Section: Effects Of Soil Organic Matter Contents On Cs Assimilation Isupporting

confidence: 64%

Temporal variations of accumulated cesium in natural soils after an uncharacteristic external exposure

Sawai

Rahman

et al. 2015

Microchemical Journal

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The accumulation behaviors and solid phase partitioning patterns of stable cesium, which have been recognized as an indicator of the long-term movement of radioactive cesium ( 137 Cs or 134 Cs) in ecosystems, were studied in typical and natural soils of Japanese origin, namely, red clay, leaf-mold and andosol soils. The retention and migration of soil-phase cesium have been explained relative to various factors, such as soil organic matter contents, competitive cation concentrations and the adsorption ratio of Cs to the solid phase. Cesium was adsorbed nearly quantitatively in the leaf-mold type soil, and the rate of Cs absorption increased as the particle size decreased in the red clay and andosol soils. The distributions of Cs within the soil solid phases were defined using the selective sequential extraction scheme and were used to explain its relative incorporation in the soil fractions. Solid phase fractionation indicated that nearly half of the total cesium concentrations in the soils were in the 'residual' fraction (representing the metal that was incorporated within the crystalline lattice of the soil and was difficult to extract). These findings are expected to provide information regarding suitable conditions for remediation, immobilization or the recovery of cesium from contaminated soils with excess cesium concentrations. KeywordsCesium; Accidental exposure; Soil contamination; Solid-phase distribution; Sequential fractionation; Temporal variation 2 Microchemical Journal, 118: 158-165, 2015 The original publication is available at: http://dx.doi.org/10.1016/j.microc.2014.09.006 IntroductionWaste disposal operations or accidental releases due to nuclear-technology-related activities have resulted in the release of large amounts of radionuclides into the environment. Among the radioactive materials, the dispersion of radiocesium at elevated concentrations evokes concern due to its extended solubility characteristics as an alkaline metal ion, its comparatively longer half-life, and its easy incorporation into living beings [8][9][10] The objective of this study is to investigate the cesium distribution in the operationally defined physico-chemical and particle size fractions of soils to understand the temporal variations of cesium after being released at an uncharacteristic rate. Experimental InstrumentsThe atomic absorption spectroscopy (AAS) technique was used to determine the stable cesium concentration in solution. An AAnalyst 600 (PerkinElmer, Waltham, MA) was used that was equipped with a transverse heated graphite atomizer with an integrated, pyrolytic graphite coated platform and a longitudinal Zeeman-effect background corrector. The light source was an electrodeless discharge lamp (EDL) that was powered by an EDL System II that was operated at 18 mA. The wavelength was set at the 852.1 nm resonance line and the monochromator spectral bandpass was set at 0.7 nm. In addition, a baseline offset correction time at 2.0 s was used with a read delay of 0.0 s. Argon was used as the purg...

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Section: Effects Of Soil Organic Matter Contents On Cs Assimilation Isupporting

confidence: 64%

Temporal variations of accumulated cesium in natural soils after an uncharacteristic external exposure

Sawai

Rahman

et al. 2015

Microchemical Journal

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“…For this reason, humic substances, as components of SOM, may be considered as a significant factor in the mobility and availability of 137 Cs in soil. The fraction of dissolved organic matter bound to soil contributes also to cesium mobility by ion-exchange [11].…”

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confidence: 99%

Interaction of the cesium cation with mono-, di-, and tricarboxylic acids in the gas phase. A Cs⁺ affinity scale for cesium carboxylates ion pairs

Mayeux

Tammiku-Taul

Massi

et al. 2009

J. Am. Soc. Mass Spectrom.

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Humic substances (HS), including humic and fulvic acids, play a significant role in the fate of metals in soils. The interaction of metal cations with HS occurs predominantly through the ionized (anionic) acidic functions. In the context of the effect of HS on transport of radioactive cesium isotopes in soils, a study of the interaction between the cesium cation and model carboxylic acids was undertaken. Structure and energetics of the adducts formed between Cs ϩ and cesium carboxylate salts [Cs ϩ RCOO Ϫ ] were studied by the kinetic method and density functional theory (DFT). Clusters generated by electrospray ionization mass spectrometry from mixtures of a cesium salt (nitrate, iodide, trifluoroacetate) and carboxylic acids were quantitatively studied by CID. By combining the results of the kinetic method and the energetic data from DFT calculations, a scale of cesium cation affinity, CsCA, was built for 33 cesium carboxylates representing the first scale of cation affinity of molecular salts. The structural effects on the CsCA values are discussed. (J Am Soc Mass

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“…The migration and the retention behavior of radiocesium are strongly dependent on the adsorption properties of the solid phase, including mineralogy, pH, ionic strength, competitive cations, and organic matter (Kim et al, 1996;Kim and Kirkpatrick, 1997;Dumat and Staunton, 1999;Takahashi et al, 1999;Cha et al, 2006;Giannakopoulou et al, 2007;Nakamaru et al, 2007;Bellenger and Staunton, 2008;Fan et al, 2012). It is generally considered that the clay minerals in soils and sediments are the major sorbents of cesium (Cs) (Anderson and Sposito, 1991;Kim et al, 1996;Kim and Kirkpatrick, 1997; In this study, radiocesium in the natural sample from Fukushima was investigated through leaching experiments.…”

Section: Introductionmentioning

confidence: 99%

Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique

et al. 2012

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Role of soil organic matter in the mobility of radiocesium in agricultural soils common in Japan

Cited by 49 publications

References 16 publications

Temporal variations of accumulated cesium in natural soils after an uncharacteristic external exposure

Temporal variations of accumulated cesium in natural soils after an uncharacteristic external exposure

Interaction of the cesium cation with mono-, di-, and tricarboxylic acids in the gas phase. A Cs⁺ affinity scale for cesium carboxylates ion pairs

Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique

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Role of soil organic matter in the mobility of radiocesium in agricultural soils common in Japan

Cited by 49 publications

References 16 publications

Temporal variations of accumulated cesium in natural soils after an uncharacteristic external exposure

Temporal variations of accumulated cesium in natural soils after an uncharacteristic external exposure

Interaction of the cesium cation with mono-, di-, and tricarboxylic acids in the gas phase. A Cs+ affinity scale for cesium carboxylates ion pairs

Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique

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Interaction of the cesium cation with mono-, di-, and tricarboxylic acids in the gas phase. A Cs⁺ affinity scale for cesium carboxylates ion pairs