Factors affecting the soil sorption of iodine

Sheppard, Marsha I.; Thibault, D.H.; McMurry, Jude; Smith, Paul A.

doi:10.1007/bf00482593

Cited by 62 publications

(32 citation statements)

References 18 publications

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“…Under acidic conditions, the more positive charges can easily adsorb anions, including iodide. Sheppard et al (1995) noted that competitive adsorption capacity between I − and OH − increases with decreasing positive charge at pHN 7. Thus, iodide adsorption capacity by three alkaline soil types in this study was found to be lower than that by two acidic soil types (JX2 and HN soils).…”

Section: Iodide Adsorption Isothermsmentioning

confidence: 99%

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

et al. 2009

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Section: Iodide Adsorption Isothermsmentioning

confidence: 99%

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

et al. 2009

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“…While most researchers have found that IO 3 À adsorption to minerals and sediments is slightly higher than I À adsorption (Couture and Seitz, 1983;Hu et al, 2005), the opposite may be true for certain minerals such as magnetite (Fuhrmann et al, 1998). Molecular iodine (I 2 ), a possible intermediate between I À and IO 3 À , can be taken up by organic matter, including humic substances (Sheppard et al, 1995;Warner et al, 2000;Schlegel et al, 2006), sorbed to mineral surfaces (Fuhrmann et al, 1998) and volatilized to the atmosphere (Keppler et al, 2000;Kü epper et al, 2008), providing additional pathways for the non-conservative behavior of iodine. Nuclear regulatory agencies throughout the world generally assume that iodine transport in the environment is conservative, and therefore an understanding of the biochemical behavior of iodine in natural systems is important for understanding the fate of radioisotopes in natural systems.…”

Section: Introductionmentioning

confidence: 97%

The kinetics of iodide oxidation by the manganese oxide mineral birnessite

Fox

Davis

Luther

2009

Geochimica et Cosmochimica Acta

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“…As early as 1979, Baes recognized that the λ s value for I was much smaller than previously used (IAEA 1982). Iodine behaves as an anion in surface soils (Sheppard and Thibault 1989, 1990, 1992Sheppard et al 1995) and Cs is often used as the perfect example of a cation that undergoes model cation-exchange reactions on soil surfaces (Gillham et al 1980). The soil loss due to leaching term, λ s , is dependent on the solubility and retention properties of each nuclide and changes its steadystate concentration.…”

Section: Application Of the Csa Modelmentioning

confidence: 99%

Review and performance of four models to assess the fate of radionuclides and heavy metals in surface soil

Sheppard¹,

Elrick²,

Peterson³

1997

Can. J. Soil. Sci.

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S. R. 1997. Review and performance of four models to assess the fate of radionuclides and heavy metals in surface soil. Can. J. Soil Sci. 77: 333-344. The nuclear industry uses computer models to calculate and assess the impact of its present and future releases to the environment, both from operating reactors and from existing licensed and planned waste management facilities. We review four soil models varying in complexity that could be useful for environmental impact assessment. The goal of this comparison is to direct the combined use of these models in order to preserve simplicity, yet increase the rigor of Canadian environmental assessment calculations involving soil transport pathways. The four models chosen are: the Soil Chemical Exchange and Migration of Radionuclides (SCEMR1) model; the Baes and Sharp/Preclosure PREAC soil model, both used in Canada's nuclear fuel waste management program; the Convection-Dispersion Equation (CDE) model, commonly used in contaminant transport applications; and the Canadian Standards Association (CSA) derived release limit model used for normal operations at nuclear facilities. We discuss how each model operates, its timestep and depth increment options and the limitations of each of the models. Major model assumptions are discussed and the performance of these models is compared quantitatively for a scenario involving surface deposition or irrigation. A sensitivity analysis of the CDE model illustrates the influence of the important model parameters: the amount of infiltrating water, V; the hydrodynamic dispersion coefficient, D; and the soil retention or partition coefficient, Kd. The important parameters in the other models are also identified. This work shows we need tested, robust, mechanistic unsaturated soil models with easily understood and measurable inputs, including data for the sensitive or important model parameters for Canada's priority contaminants. Soil scientists need to assist industry and its regulators by recommending a selection of models and supporting them with the provision of validation data to ensure highquality environmental risk assessments are carried out in Canada.

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Factors affecting the soil sorption of iodine

Cited by 62 publications

References 18 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

The kinetics of iodide oxidation by the manganese oxide mineral birnessite

Review and performance of four models to assess the fate of radionuclides and heavy metals in surface soil

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