Elisabeth Leclerc

Elisabeth Leclerc
Andra · Safety and Environment Division

Master of Engineering

About

64
Publications
7,125
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1,159
Citations
Additional affiliations
January 2010 - May 2014
Andra
Position
  • assistant manager, manager of long-term environment observatory

Publications

Publications (64)
Article
Non-human biota in radiological risk assessment is typically evaluated using Reference Organisms (ROs) or Reference Animals and Plants (RAPs), for all exposure situations. However, it still remains open whether the use of an increased number of species would improve the ability to demonstrate protectiveness of the environment. In this paper, the re...
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Full-text available
Either in normal or post-accidental situations, the ingestion of locally-produced foodstuffs, potentially contaminated, is one of the main exposures to the population living in the vicinity of nuclear facilities. For this reason, the French Institute for Radioprotection and Nuclear Safety has developed a specific methodology and has carried out sur...
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Andra Environmental Specimen Bank (ESB) was established in 2010 as a part of the Perennial Observatory of the Environment (OPE), ongoing Long-Term Environmental Research Monitoring and Testing System located next to the Underground Research Laboratory (URL) at Bure, Meuse/Haute-Marne, France. The URL is used to study the deep geological disposal of...
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Chlorine-36 is a cosmogenic nuclide mainly produced in the atmosphere by interactions between energetic particles originating from the cosmic radiations and 40Ar. Because of its long half-life (T1-2 = 3.01 105 yr) and its high mobility, chlorine-36 is a critical radionuclide concerning radioactive waste repository sites. Moreover, it has been shown...
Article
Apart from radiocaesium and radiostrontium, there have been few studies on the foliar transfer of radionuclides in plants. Consequently, specific translocation factor (ftr) values for 129I, 79Se and 36Cl are still missing from the IAEA reference databases. The translocation of short – lived isotopes, 125I and 75Se, and of 36Cl to wheat grain were m...
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A network for the long term observation of forest ecosystems has been established in the Observatoire perenne de l’environnement (Permanent Environmental Observatory) created by the National Agency for Radioactive Wastes. The network is located at the boundary between the Meuse and Haute-Marne departements and comprises some hundred permanent inven...
Article
A network for the long term observation of forest ecosystems has been established in the Observatoire pêrenne de l'environnement (Permanent Environmental Observatory) created by the National Agency for Radioactive Wastes. The network is located at the boundary between the Meuse and Haute-Marne départements and comprises some hundred permanent inven...
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In acidic forest soils, availability of inorganic nutrients is a tree-growth-limiting factor. A hypothesis to explain sustainable forest development proposes that tree roots select soil microbes involved in central biogeochemical processes, such as mineral weathering, that may contribute to nutrient mobilization and tree nutrition. Here we showed,...
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The role of ectomycorrhizal fungi on mineral nutrient mobilization and uptake is crucial for tree nutrition and growth in temperate forest ecosystems. By using a “mineral weathering budget” approach, this study aims to quantify the effect of the symbiosis with the ectomycorrhizal model strain Laccaria bicolor S238N on mineral weathering and tree nu...
Article
A review of the published literature about foliar transfer radionuclides to cereal grains was carried out with a special interest for translocation factors. Translocation describes the distribution of radionuclides within the plant after foliar deposition and radionuclide absorption onto the surface of leaves. It mainly depends on elements and the...
Article
Parameters regarding fate of (63)Ni in the soil-plant system (soil: solution distribution coefficient, K(d) and soil plant concentration ratio, CR) are mostly determined in controlled pot experiments or from simple models involving a limited set of soil parameters. However, as migration of pollutants in soil is strongly linked to the water migratio...
Article
Excavation of geological materials by civil engineering operations generates fresh parent rocks that are transferred from the deep layers to the surface in a very short time. Thus they are exposed to pedogenetic factors. Prediction of the characteristics and functioning (e.g. plant support and water filter) and impacts of the newly formed soils req...
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The mineralogy of bulk and rhizosphere soils was compared to assess the effect of roots on mineral weathering in a Typic Dystrochrept supporting Norway spruce (Picea abies [L.] Karst) and oak (Quercus sessilifl ora Smith). In an experimental forest site (Breuil-Chenue, France), systematic soil sampling was performed in forty pits. The soil adhering...
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Sensitivity analyses have shown major role of foliar transfer for many radionuclides in the context of radiological impact assessments. A review of the published literature about foliar transfer focusing on translocation factors was carried out in order to constitute an updated database on one hand and to use the appropriate existing values of tran...
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If no data are available for a specific radionuclide its analogue could be used in radioecological models. They might be used not only in the frame of screening modelling. Relevant processes and features have to be known, such as time scales of these processes, physical, chemical and biological properties of the environment and relevant media. An a...
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The ectomycorrhizal symbiosis alters the physicochemical and biological conditions in the surrounding soil, thus creating a particular environment called ectomycorrhizosphere, which selects microbial communities suspected to play a role in gross production and nutrient cycling. To assess the ectomycorrhizosphere effect on the structure of microbial...
Article
Three soils were incubated for 4-day periods with selenite (0–5mg Se kg−1) and the effect of straw amendment was also studied for one of these soils. The same soil was also incubated for up to 6 weeks, with and without straw and selenite (0–2mg Se kg−1). Changes in microbial activity (oxygen respiration) and dynamics (total, fungal biomass; bacteri...
Article
Selenium is an essential nutrient that is potentially toxic: one of its radio-elements is also a component of long-lived radioactive waste for which long-term deep geological storage is envisaged. The chemistry of Se in soils is complex and very sensitive to redox potential and microbial activity which largely determine its oxidation state and chem...
Article
Soil (Haplic Luvisol) was incubated in anaerobic microcosms with and without addition of a small amount of selenite (2 mg Se kg−1) and straw, and changes in both bacterial populations (fermentative and selenite-respiring) and selenium fractionation were assessed. Selenite caused an initial decrease in CO2 emission (−98% alone and −60% with straw) b...
Article
This in situ study assesses the long term sorption of I in a natural peat bog, a matter that is scarcely addressed but required for safety studies such as for radioactive waste disposal. Fifteen years after the artificial contamination of a boreal peat bog, the groundwater (piezometers), the peat and the vegetation were resampled to determine I dis...
Article
This study aimed to (i) evaluate whether the K(d) value of selenium is dependent upon the soil microbial activity and (ii) define the limitation of the use of the K(d) concept to describe selenium behaviour in soils when assessing the long-term radiological waste disposal risk. K(d) coefficients, as well as information on selenite speciation in the...
Article
The aim of this paper was i) to determine the Ni-bearing minerals and localize Ni in natural and contaminated Ni-rich soils, ii) to characterize Ni availability with isotopic exchange kinetics (IEK) and iii) to study its interactions with soil mineralogy and characteristics along a gradient of weathering intensity. We sampled 16 soils varying from...
Article
The various uses of zirconium (Zr) in chemical and nuclear industries generate a potential risk of environmental contamination by this element. This study was performed on two agricultural soils, an acidic soil (A) and a clayey calcareous soil (B), collected in the Meuse/Haute Marne experimental site of the French National Agency for radioactive wa...
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This work aims to study the influence of oxidation degree state which reached by organic matter included in argillaceous rocks on lixiviation and mobilization of compounds. Experimental lixiviation was carried out on two argillaceous rocks sampled in the surface deposit of the Andra laboratory (Bure, France). Molecular and spectroscopic characteriz...
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Knowledge of radionuclide or trace element retention and translocation to plants following an aerial contamination event, for example, sprinkling with contaminated water, is necessary for the evaluation of human exposure through consumption of contaminated vegetables. The fate of 63Ni and 109Cd in all plant parts of three different vegetables after...
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In order to perform radiological impact assessments of radioactive waste disposals, a compartmental model taking into account generic data for biosphere transfer parameters values is usually used. To improve its performance assessments calculations, Andra (French national radioactive waste management agency) decided to adapt this type of biosphere...
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Iodine-129 is a radionuclide of major concern in the international safety assessments for deep geological storage and disposal of nuclear waste because it migrates quickly through the geosphere to the biosphere and then from the soil to humans through the food-chain. However, in organic soils the 129I may be immobilized over a long time period, and...
Article
Radioniobium is present in long-lived nuclear waste as a result of the activation of zirconium pellets associated with the nuclear fuel. The behaviour of niobium (Nb) in the environment and especially its fate in the soil-plant system has not been thoroughly investigated so far. In safety assessment of French long-lived nuclear waste disposal, data...
Article
For safety assessment purposes, it is necessary to study the mobility of long-lived radionuclides in the geosphere and the biosphere. Within this framework, we studied the behaviour of Tc-99 in biologically active organic matter-rich soils. To simulate the redox conditions in soils, we stimulated the growth of aerobic and facultative denitrifying a...
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Availability is a key property for the assessment of soil-to-plant transfer of heavy metals. This work was conducted to determine whether the available pool of Ni differs according to the ability of plants to take up and accumulate the metal. An excluder plant species (Triticum aestivum L.), an indicator (Trifolium pratense L.), and 3 populations o...
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The aim of this study is to rank the relative importance of soil properties, root uptake and root-to-shoot redistribution on the transfer of the trace element nickel from soil to the shoots of non hyperaccumulatings plants. Two contrasting soils and seven plant species have been studied using the radioactive isotope, 63Ni. Shoots and roots were ana...
Article
Climatic changes over the long term will modify significantly the biosphere, with glaciation events probably taking place in the next 100 000 years. This is important to safety assessments of nuclear waste disposal facilities that contain high-level and long-lived waste. The soils will evolve toward new situations, and their properties will be cons...
Article
Models for safety assessment of radioactive waste repositories need accurate values of the soil-to-plant transfer of radionuclides. In oxidizing environments, (99)Tc is expected to occur as pertechnetate ((99)TcO(4)(-)). Due to its high mobility, leaching of this element in the field might be important, potentially affecting the reliability of esti...
Article
Leaves of plants have the ability to accumulate the long-lived fission product (99)Tc. In the present work, an attempt was made to separate and characterize technetium species formed in maize grown on soil contaminated with Tc(VII)O(4)(-) solution. Data obtained from selective extraction, a Phosphorimager and liquid scintillation were employed.
Article
A detailed study of the isotopic exchangeability of native nickel is presented for two contrasting soils. Non-sterile soils were compared with γ-sterilized soil to assess the role of microbial activity in modifying nickel speciation. The distribution coefficient, Kd, was measured in a range of suspensions and in moist soil. Solution and soil solids...
Article
As a result of isotopic dilution, the availability to plants of radioisotopes introduced into the soil solution should be directly related to the size of the isotopically exchangeable pool (E(t))-value). This work was undertaken to test this hypothesis for the radionuclide 63Ni. The demonstration was based on pot experiments conducted with seven so...
Article
Full-text available
Leaves of plants have the ability to accumulate the long lived fission product 99 Tc. In this work, an attempt was made to separate and characterize technetium species induced by maize grown on soil receiving Tc VII O 4-solution. Combination of data obtained with selective extraction and use of Phosphorimager, spectrophotometry and Liquid Scintilla...
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Methods are needed for the rapid characterization of the phytoavailable fraction of trace elements in soils to assess the risk of contamination of the food chain and evaluate the impact of waste management practices. This investigation was undertaken to study the phytoavailability of Ni in soils using the isotopic exchange method. Isotopic exchange...
Article
Bioavailability of 99Tc to plants is believed to decrease with time in aerobic environments. This study was carried out to follow the fate of 99Tc in the soil-plant systems according to the form of applied 99Tc and the time of incubation in the soil. Two series of experiments were conducted: (i) NH499TcO4/- was applied to two inceptisols (A and B)...
Chapter
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Safety assessment models for potential sites selected for underground repositories of high level and long-lived radioactive waste requires the prediction of phytoavailability of such radionuclides at the regional scale. In this context, the areas in which the radionuclides may be highly mobile or accumulate have to be well known, as they will contr...
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The soil organic matter (OM) retains some organic and metallic contaminants. Most often, only the quantity of OM is known to influence the sorption of the element/molecule. In the case of iodine, the sorption has been related to some specific chemical characteristics of the OM. In deed, it has been suggested that the phenolic groups of organic mole...

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