Am-241 remobilization in a calcareous soil under simplified rhizospheric conditions studied by column experiments

Perrier, Thomas; Martin-Garin, A.; Morello, M.

doi:10.1016/j.jenvrad.2004.07.002

Cited by 8 publications

(5 citation statements)

References 38 publications

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“…The con centra tion of Etidronic acid was se lected as op ti mal based on [9,10]. The con cen tra tions of the ox a late and ci trate were de ter mined ac cord ing to [21][22][23] to cover their whole prob a ble range. -4 mL of sam ple ware trans ferred into 20 mL scintil la tion vial filled with 10 mL of scin til la tion cock tail AquaLight.…”

Section: Col Umn Prep a Ra Tionmentioning

confidence: 99%

“…The ob jec tive of this work is to find suit able elu tion agents for Diphonix resin and to de ter mine their ex trac tion ra tios un der con di tions of varying con cen tra tions of the mo bile phase and of ni tric and hydro chlo ric ac ids used to con di tion the col umns. As can be seen in var i ous sources the most fre quently used complexing agents are or ganic com pounds con tain ing nitrous or phos pho rous func tional groups, e. g. tri-n-butylphosphate (TBP), tri-n-octyl-phosphin-ox ide (TOPO), ethylenediamine-tetraacetic acid (EDTA), diglycolamides, and N, N, N', N'-tetraoctyl diglycolamide (TODGA) [17 -20], Fran cis [21], Horwitz [22], and Perrier [23] de scribe the use of oxa lates and ci trates of var i ous concen tra tions. Sanchez-Gon za lez [24] men tions car bon ates for the ex trac tion of ura nium.…”

Section: Introductionmentioning

confidence: 99%

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Study of the alternative elution agent for the DIPHONIX resin

Kanka

Janda

2016

NUCL TECH RAD PROT

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The work was fo cused on the ex per i men tal de ter mi na tion of the sep a ra tion-ex trac tion proper ties of solid extrahent DIPHONIX (Eichrom In dus tries, USA) de pend ing on the used eluent. Ex trac tion prop er ties were tested for plu to nium, am er i cium, cu rium, and ura nium. The used mo bile phases were hy dro chlo ric acid and ni tric acid at var i ous con cen tra tions. The aim was to find the most ap pro pri ate com bi na tion of mo bile phase and eluent, which would lead to the high est pos si ble yield. The most com monly used eluent pub lished in lit er a ture is 1-hydroxyethane 1, 1-diphosphonic acid (HEDP, Etidronic Acid). Based on the re search the spe cific com pounds were se lected which are generaly known for their complexing prop er ties, such as the salts of ox alic acid and cit ric acid at dif fer ent con cen tra tions. Ac tiv i ties of the samples ob tained by elu tion were mea sured by liq uid scin til la tion spec trom e try.

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Section: Col Umn Prep a Ra Tionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the alternative elution agent for the DIPHONIX resin

Kanka

Janda

2016

NUCL TECH RAD PROT

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“…Introduction 23 Natural colloids are ubiquitous in environments 1 , whose effects on nuclide migration in 24 groundwater have been intensively studied by field monitoring 2, 3 , lab−scale experiments [4][5][6][7][8][9][10][11] as well as 25 model prediction 12,13 . Introduction 23 Natural colloids are ubiquitous in environments 1 , whose effects on nuclide migration in 24 groundwater have been intensively studied by field monitoring 2, 3 , lab−scale experiments [4][5][6][7][8][9][10][11] as well as 25 model prediction 12,13 .…”

Section: Environmental Impactmentioning

confidence: 99%

“…121 The relationships between the initial Pu concentration (C 0 ), the concentration of suspended Pu (C m ), 122 the concentration of dissolved Pu (C d ), the amount of Pu sorbed on the granite grains per unit volume 123 (C s ), the concentration of colloidal Pu (C c ), the concentration of polymeric species (C pc ) and the 124 concentration of particle-associated species (C ac ) are shown in Eq. (6), (7) and (8), 126 respectively. The fraction of Pu 125 partitioning in the dissolved, solid and colloidal phase is calculated according to Eq.…”

Section: Environmental Impactmentioning

confidence: 99%

“…Natural colloids are ubiquitous in the environment 1 and their effects on nuclide migration in groundwater have been intensively studied by eld monitoring, 2,3 lab-scale experiments [4][5][6][7][8][9][10][11] and model prediction. 12,13 As estimated by model predictions based on the traditional distribution coefficient measured in laboratories, low-solubility radionuclides such as Pu will transport only several centimeters per year, [14][15][16][17] which is inconsistent with the observation in eld studies.…”

Section: Introductionmentioning

confidence: 99%

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Plutonium partitioning in water–granite and water–α-FeOOH systems: from a viewpoint of a three-phase system

Lin

Dang

Xie

et al. 2015

Environ. Sci.: Processes Impacts

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Traditional sorption experiments commonly treat the colloidal species of low-solubility contaminants as immobile species when separated by centrifugation or ultrafiltration. This study shows that, from a viewpoint of a three-phase system, the mobile Pu species, especially the colloidal species, play an important role in Pu partitioning in water-granite and water-α-FeOOH systems. A new distribution coefficient term Ks/(d+c) was defined to take the mobile colloidal species into consideration, and it differs to the traditional distribution coefficient Ks/d by orders of magnitude in the water-granite and water-α-FeOOH systems. This term, Ks/(d+c), can quantitatively describe Pu partitioning in the suspension, in particular the fraction of mobile species that dominate Pu migration in the environment. The effects of ionic strength (I) and pH on the Pu partitioning in water-granite and water-α-FeOOH systems are well interpreted with respect to the zeta potential change of granite grains, α-FeOOH colloid particles and polymeric Pu. It is concluded that the presence of the α-FeOOH colloid with a low concentration (<10 mg L(-1)) is favorable for the stability of colloidal Pu and leads to large proportion of mobile Pu, especially colloid-associated Pu, which will migrate much faster than dissolved Pu in groundwater.

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Methodological approach to assess the effect of soil ageing on selenium behaviour: first results concerning mobility and solid fractionation of selenium

et al. 2006

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International audienceThe aim of the study presented here is to determine the impact of short- and medium-term transformations (0–3 years) of the soil organic matter (SOM) on the major processes and parameters that enable or inhibit selenite, Se(+IV), transfers between the soil components (solid, liquid or gaseous). Three types of soil of similar mineralogical origin but containing diverse quantities and qualities of SOM were first contaminated with Se(+IV) and incubated at 28°C. Soils were sampled throughout the incubation period to characterise the mobility of Se (batch and soil column experiments) and also its fractionation within the soil compartments (selective extractions and size-density fractionation). The following are the main results obtained within the first month of incubation. (a) Selenium was partly volatilized during soil incubation (<0.1%), (b) Se extracted with CaCl2 (5×10−4 M) was equally small for the three soil samples (∼1–5%), suggesting that Se was strongly sorbed on the solid phase and (c) at least 10% of Se was associated to the particulate organic matter $${\left( {{\text{POM}}_{{ > {\text{50}}\mu {\text{m}}}} } \right)},$$whereas 60% of Se was extracted with soil humic substances. These results suggested that both SOM quantity and quality played a significant role in selenium retention. Furthermore, comparison between experimental and predicted variations of CO2 fluxes (due to C mineralisation) and soil biomasses are presented. By this way, we estimated the capacity of the RothC model as an experimental gauging tool in the prediction of C turnover on a laboratory scale

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Am-241 remobilization in a calcareous soil under simplified rhizospheric conditions studied by column experiments

Cited by 8 publications

References 38 publications

Study of the alternative elution agent for the DIPHONIX resin

Study of the alternative elution agent for the DIPHONIX resin

Plutonium partitioning in water–granite and water–α-FeOOH systems: from a viewpoint of a three-phase system

Methodological approach to assess the effect of soil ageing on selenium behaviour: first results concerning mobility and solid fractionation of selenium

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