Experimental values for 241Am and 239+240Pu Kd's in French agricultural soils

Roussel-Debet, S.

doi:10.1016/j.jenvrad.2004.06.004

Cited by 17 publications

(7 citation statements)

References 26 publications

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“…K d (Am) is expected to depend on the soil pH and on the sand and clay contents (Allard et al, 1984;Roussel-Debet, 2005). The univariate correlations between K d (Am) and soil properties in this database partially confirm this assumption; the best correlations were for pH (r ¼ 0.35; 11% of the variance explained) and sand content (r ¼ À0.48; 21% of the variance explained).…”

Section: The Cases Of Americium and Plutoniumsupporting

confidence: 56%

New best estimates for radionuclide solid–liquid distribution coefficients in soils. Part 3: miscellany of radionuclides (Cd, Co, Ni, Zn, I, Se, Sb, Pu, Am, and others)

Gil-García

Tagami²,

Uchida³

et al. 2009

Journal of Environmental Radioactivity

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Section: The Cases Of Americium and Plutoniumsupporting

confidence: 56%

New best estimates for radionuclide solid–liquid distribution coefficients in soils. Part 3: miscellany of radionuclides (Cd, Co, Ni, Zn, I, Se, Sb, Pu, Am, and others)

Gil-García

Tagami²,

Uchida³

et al. 2009

Journal of Environmental Radioactivity

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“…This figure also shows that with the aging of organic amendment, the soils amended returned to its original organic carbon content and the Histosol presented a reduction in its original content, indicating an important degradation of labile compounds of soil organic matter. Table 2 presents the values of Kd for 241 Am found in the studied soils and Kd values reported by Roussel-Debet [12]. The difference between the values determined in this study and those found in soils of temperate climate areas seems to confirm the great mobility of americium in the tropical soils and, therefore, this aspect must be considered when establishing protective measures after an accidental contamination.…”

Section: Resultssupporting

confidence: 47%

“…The methodology for Kd determination followed the procedure described at Roussel-Debet [12]. The sorption experiments were carried out using the batch technique: 10 g of soil samples was mixed in a 200 ml polypropylene centrifuge with 80 mL of a solution having ∼515 Bq.L −1 of americium in nitric acid were shacked at room temperature for 72 hours.…”

Section: Methodsmentioning

confidence: 99%

The influence of Brazilian soils properties in Americium sorption

et al. 2011

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Abstract.Although some radioecological studies have been accomplished in Brazilian soils supplying useful information to optimization of emergency planning actions in rural areas and to the management of soils contaminated by 137 Cs, 60 Co and 90 Sr, few studies were made with transuranic elements in tropical agricultural areas. The different scenarios found in Brazilian agricultural environments enhance the importance of studying the biogeochemical behavior of radionuclides in representative soils. The objective of this work was to determine the mobility of 241 Am in 3 different Brazilian agricultural soils evaluating migration with depth and Kd values for 241 Am and the effect of organic amendments on this behavior. A strong effect of organic amendments on mobility of americium could be observed. The values of Kd obtained in all studied tropical soils were however smaller than those found in European soils and from those recommended by IAEA to be used as default values in the absence of regional data. This result reinforces the vulnerability of some tropical soils to a contamination, emphasizing the need to use of regional values.

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“…The way in which Pu partitions itself between possible species in any given environmental system is known to depend upon the chemical form in which it enters the system, as well as on redox conditions, pH, ionic strengths, the type and concentration of organic and inorganic complexing agents, and the extent of hydrolytic colloid formation [15]. In the simplest cases, the partitioning extent can be expressed through K d , the distribution (or partition) coefficient, which is the ratio of the radionuclide concentration in the solid phase to the radionuclide concentration in the solution [16]. Sorption process is dynamic and complicated in groundwater within most geological media.…”

Section: Introductionmentioning

confidence: 99%

Factors influencing plutonium sorption in shale media

et al. 2010

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Plutonium / Sorption / Distribution coefficient / Grain size / pH / Water/solid ratio / ComplexationSummary. The extent and factors influencing sorption of plutonium (Pu) in shale media have been studied in batchtype experiments. The equilibrium time and isotherm of Pu sorption have been firstly determined. The effect of shale grain size, aqueous pH, water/solid ratio, co-existing ions (cations and anions) and temperature were studied as the factors likely to influence Pu sorption. The experimental variables included the following: grain sizes in five ranges, 0.12 to 0.15 mm, 0.15 to 0.18 mm, 0.18 to 0.25 mm, 0.25 to 0.38 mm, and 0.38 to 0.83 mm; solution pH values of 4, 6, 8, and 10; water/solid ratios of 10 : 0.25, 10 : 0.5, 10 : 0.75, and 10 : 1; temperatures of 20 • C, 40 • C, and 60 • C); and selected coexisting conventional cations including Na + , Fe + , Al 3+ , Ca 2+ , and K + and anions including SO 4 2− , CO 3 2− , NO 3 − , and Cl − in each case in solutions of the same total ionic strength. The experimental results demonstrate that the equilibrium time of Pu sorption is 9 d, that the sorption behavior of Pu in the solution is well described by the Freundlich sorption isotherm (C s = kC N eq ), and that Pu is strongly sorbed on shale media. The extent of Pu sorption increased with decreasing grain size, apparently in response to the increase in specific surface area and total pore volume. The results also show that Pu sorption increases with increasing solution pH and with increasing water/solid ratio. The influence of co-existing anions on Pu sorption was much stronger, under the same conditions, than that of the cations; this was attributed to Pu complexation in solution, i.e., the complexing apparently weakened the sorption of Pu on shale particles in the solution. Finally, the influence of varying temperature on Pu sorption is found to be less important than that of other factors, but should never be ignored.

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Experimental values for 241Am and 239+240Pu Kd's in French agricultural soils

Cited by 17 publications

References 26 publications

New best estimates for radionuclide solid–liquid distribution coefficients in soils. Part 3: miscellany of radionuclides (Cd, Co, Ni, Zn, I, Se, Sb, Pu, Am, and others)

New best estimates for radionuclide solid–liquid distribution coefficients in soils. Part 3: miscellany of radionuclides (Cd, Co, Ni, Zn, I, Se, Sb, Pu, Am, and others)

The influence of Brazilian soils properties in Americium sorption

Factors influencing plutonium sorption in shale media

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