Factors affecting interaction of radioiodide and iodate species with soil

Fukui, Masami; Fujikawa, Yoko; Satta, Naoya

doi:10.1016/0265-931x(95)00039-d

Cited by 70 publications

(70 citation statements)

References 15 publications

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“…Therefore, our results with Chinese soils demonstrate that the capacity of iodate adsorption by various soils (except for GX soil) is greater than those of iodide adsorption. Our results are in agreement with the findings of Fukui et al (1996). Fig.…”

Section: Comparison Of Iodate and Iodide Adsorption By Soilssupporting

confidence: 83%

Adsorption and desorption of iodine by various Chinese soils: II. Iodide and iodate

et al. 2009

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Section: Comparison Of Iodate and Iodide Adsorption By Soilssupporting

confidence: 83%

Adsorption and desorption of iodine by various Chinese soils: II. Iodide and iodate

et al. 2009

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“…Nishimaki et al (1994) observed the same behavior of iodide versus iodate sorption, with the iodate sorption showing a two-step mechanism -an initial rapid equilibrium sorption, followed by slow non-equilibrium sorption. The conclusions of Fukui et al (1996) were consistent with Yoshida et al (1992), except they concluded that iodide sorption seemed to be more complicated than pure electrostatic attraction. …”

Section: Influence Of Other Sediment Parameters On Iodine Sorptionmentioning

confidence: 53%

“…Yu et al (1996) demonstrated the importance of organic matter to iodide sorption by showing that the individual high surface area inorganic phases that make up most of a volcanic soil poorly sorb iodide relative to the bulk soil. A different approach was taken by Fukui et al (1996) who compared iodine sorption onto a soil to sorption onto pure humic material. K d values on the humic material were 10 times higher than on the soil.…”

Section: Influence Of Sediment Organic Matter On Iodine Sorptionmentioning

confidence: 99%

Biogeochemical Considerations Related To The Remediation Of I-129 Plumes

Kaplan

Yeager

Denham

et al. 2012

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“…However, strong assimilation of iodine into soil organic matter has been widely reported (e.g. Whitehead, 1973a;Francois, 1987a,b;Fukui et al, 1996;Sheppard et al, 1996;Yu et al, 1996;Steinberg et al, 2008a,c;Dai et al, 2009) and humus may constitute the primary reservoir of iodine in most soils. The fate of inorganic iodine, and the mechanisms governing its incorporation into organic matter, have been the focus of a number of investigations.…”

Section: Introductionmentioning

confidence: 98%

Iodine dynamics in soils

Shetaya

Young

Watts

et al. 2012

Geochimica et Cosmochimica Acta

134

118

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We investigated changes in iodine ( 129 I) solubility and speciation in nine soils with contrasting properties (pH, Fe/Mn oxides, organic carbon and iodine contents), incubated for nine months at 10 and 20°C. The rate of 129 I sorption was greater in soils with large organic carbon contents (%SOC), low pH and at higher temperatures. Loss of iodide (I À ) from solution was extremely rapid, apparently reaching completion over minutes-hours; iodate (IO À 3 ) loss from solution was slower, typically occurring over hours-days. In all soils an apparently instantaneous sorption reaction was followed by a slower sorption process for IO À 3 . For iodide a faster overall reaction meant that discrimination between the two processes was less clear. Instantaneous sorption of IO À 3 was greater in soils with high Fe/Mn oxide content, low pH and low SOC content, whereas the rate of time-dependent sorption was greatest in soils with higher SOC contents. Phosphate extraction (0.15 M KH 2 PO 4 ) of soils, $100 h after 129 I spike addition, indicated that concentrations of sorbed inorganic iodine ( 129 I) were very low in all soils suggesting that inorganic iodine adsorption onto oxide phases has little impact on the rate of iodine assimilation into humus. Transformation of dissolved inorganic 129 IO À 3 and 129 I À to sorbed organic forms was modelled using a range of reactionand diffusion-based approaches. Irreversible and reversible first order kinetic models, and a spherical diffusion model, adequately described the kinetics of both IO À 3 and I À loss from the soil solution but required inclusion of a distribution coefficient (k d ) to allow for instantaneous adsorption. A spherical diffusion model was also collectively parameterised for all the soils studied by using pH, soil organic carbon concentration and combined Fe + Mn oxide content as determinants of the model parameters (k d and D/r 2 ). The kinetic model parameters were not directly related to a single soil parameter; inclusion of pH, SOC, oxide content and temperature was necessary to describe the observed behaviour. From the temperature-dependence of the sorption data the activation energy (E a ) for 129 IO À 3 transformation to organic forms was estimated to be $43 kJ mol À1 . The E a value was independent of %SOC and was consistent with a reaction mechanism slower than pore diffusion or physical adsorption, but faster than most surface reactions.

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Factors affecting interaction of radioiodide and iodate species with soil

Cited by 70 publications

References 15 publications

Adsorption and desorption of iodine by various Chinese soils: II. Iodide and iodate

Adsorption and desorption of iodine by various Chinese soils: II. Iodide and iodate

Biogeochemical Considerations Related To The Remediation Of I-129 Plumes

Iodine dynamics in soils

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