Studies of the speciation of plutonium and other actinides in natural groundwater using anion exchange resin

Cooper, E.L.; Haas, Michael; Mattie, J.F.

doi:10.1016/0969-8043(95)00159-b

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…Its relatively large portion in the strong hydrophobic fraction (SPE cartridge) is consistent with the association of 241 Am with NOM in other studies (Artinger et al, 1998;Schuessler et al, 2000;Cooper et al, 1995, to name a few). Our sample somewhat contrasts the findings of Cooper et al (1995), because their chromatographic separation suggested that 241 Am was associated with the smaller-sized NOM. The work at the Gorleben site (Artinger et al, 1998;Schuessler et al, 2000) is particularly significant, because the authors deal with the kinetics of association/dissociation of Am with NOM.…”

Section: Americium-241supporting

confidence: 70%

“…The presence of 137 Cs in the hydrophilic fraction was not surprising, but it was surprising to find approximately the same amount of it retained on the cartridge (strong hydrophobic fraction). The behaviour of 241 Am was similar, but this is not surprising because the association of 241 Am with NOM is well documented (see e.g., Cooper et al, 1995;Artinger et al, 1998).…”

Section: Resultsmentioning

confidence: 50%

“…The majority of the 60 Co found in the small molecular fraction (~83%) is consistent with previous sampling near this site. Cooper et al (1995) have found that 91% of the 60 Co passed through a 3000 Da membrane, while reported that 60.9% passed through a 1000 Da filter, but only 13.9% through a 500 Da membrane. The differences between our studies may be due to a change in the nature of the organics, especially that, at the time our sample was taken, the pit had not been used for years, while this was not the case in the other studies.…”

Section: Cobalt-60mentioning

confidence: 94%

“…In previous work at the Chalk River Laboratories (CRL) on contaminated groundwaters, the general character of radionuclides has been determined, particularly with respect to associations between radioactive contaminants and organics Champ et al, 1984;Champ and Robertson, 1986;Cooper et al, 1995;Robertson et al, 2000;Caron et al, 2002). Particularly, it has been suggested that aqueous speciation of some radionuclides ( 60 Co, 137 Cs, 241 Am, 239 Pu, 244 Cm, plus a few others) plays an important role in sorption, hence retardation of contaminants in aquifers (Robertson et al, 2000;Caron et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Pre-assessment of the speciation of 60Co, 125Sb, 137Cs and 241Am in a contaminated aquifer

Mankarios

2004

Journal of Environmental Radioactivity

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Section: Americium-241supporting

confidence: 70%

Section: Resultsmentioning

confidence: 50%

Section: Cobalt-60mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Pre-assessment of the speciation of 60Co, 125Sb, 137Cs and 241Am in a contaminated aquifer

Mankarios

2004

Journal of Environmental Radioactivity

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“…[2][3][4] Some parts of actinides and lanthanides in natural waters are associated with anionic organic materials, especially humic substances (humic and fulvic acids) in the different molecular size fractions. [5][6][7][8][9][10] The authors have reported the complexation properties of humic substances with actinides-lanthanides such as Eu, Am and Pu [11][12][13][14] . These molecular size effects of humic substances on the complexation affinity and the sorption ability may significantly affect the migration behavior of actinides.…”

Section: Introductionmentioning

confidence: 99%

Molecular size distribution of Pu in the presence of humic substances in river and groundwaters

Nagao

Sakamoto²,

Tanaka³

et al. 2007

J Radioanal Nucl Chem

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The association properties of Pu with aquatic humic substances in a 0.01M NaClO 4 solution at pH 6-8 were studied on the basis of molecular size distribution. Seven humic substances were isolated from river and groundwaters by the XAD extraction technique, and were used for comparing their effects on the association of Pu. In the presence of humic acid, dominant molecular size of Pu was 100k-30k Da.The Pu in the presence of fulvic acid has three dominant molecular size of 30k-10k Da,30k-5k Da and less than 5k Da. The association of Pu-humus complexes may be controlled by the molecular size distribution of humic substances, and their characteristics of each size fraction.2

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Speciation: Radionuclides

Salbu¹

2005

Encyclopedia of Inorganic Chemistry

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To assess the environmental impact of radioactive contamination of different ecosystems, information on source terms, mobility, biological uptake, and associated effects is needed. However, naturally occurring and artificially produced radionuclides can be present in different physicochemical forms (ions, colloids, nanoparticles, pseudocolloids, particles) influencing the mobility and biological uptake. Following severe nuclear events associated with the nuclear weapon or fuel cycles, a major fraction of refractory radionuclides will be present as radioactive particles; radionuclides are also present as colloids or low molecular mass (LMM) ionic species in effluents from nuclear installations. Thus, the distribution of radionuclide species depends on the source and release scenarios. LMM radionuclide species are believed to be mobile and potentially bioavailable, while high molecular mass (HMM) species such as nanoparticles, colloids, polymers, and pseudocolloids are mobile in water. Radioactive particles are considered biologically inert, but can be retained in filtering organisms as well as in soils and sediments. If mobile species are present, ecosystem transfer is relatively fast, whereas the ecosystem transfer is delayed if particles are present. Owing to time‐dependent transformation processes such as interactions of mobile and reactive radionuclide species with components in soils and sediments or particle weathering and subsequent remobilization of associated radionuclide species, the original distribution of radionuclides deposited in ecosystems will change over time. Therefore, information on radionuclide species released and deposited, as well as on time‐dependent transformation processes influencing the distribution of radionuclide species, is essential for the assessment of the environmental impact and risk associated with radionuclide contamination. This article summarizes available speciation techniques that should be utilized within radioecology, including fractionation and solid‐state speciation, to characterize radionuclide species in waters, soils, and sediments.

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Studies of the speciation of plutonium and other actinides in natural groundwater using anion exchange resin

Cited by 25 publications

References 16 publications

Pre-assessment of the speciation of 60Co, 125Sb, 137Cs and 241Am in a contaminated aquifer

Pre-assessment of the speciation of 60Co, 125Sb, 137Cs and 241Am in a contaminated aquifer

Molecular size distribution of Pu in the presence of humic substances in river and groundwaters

Speciation: Radionuclides

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