Lydie Forestier - Academia.edu (original) (raw)

Papers by Lydie Forestier

Organo-Clay Interactions (OCIs) are a poorly investigated topic despite the potential benefits in... more Organo-Clay Interactions (OCIs) are a poorly investigated topic despite the potential benefits in both fundamental and industrial studies fields. Indeed, Organic Matter (OM) sorption on clays is a mechanism involved in several research areas: past and actual environmental problematics, hydrocarbons sources rocks or soil sciences considerations. In actual environmental issues, new research axes are emerging on OCIs applications on organic pollutants treatments. In the actual environmental management field, OCIs are investigated in order to characterize the role of clay minerals on landfill barriers strengthening (Sanchez-Jimenez et al., 2011). OCIs investigations in paleoenvironmental field are primordial for the calibration of climatical and paleoecological biomarkers proxies. On the topic of formation and evolution of hydrocarbon source rocks, OCIs play an important role on the early steps of diagenetic processes. Several models of OM preservation paths are already admitted (Boussa...

In the framework of domestic waste disposals, the in-situ compaction of soil is usually used to o... more In the framework of domestic waste disposals, the in-situ compaction of soil is usually used to obtain engineered clay barriers with suitable confining properties. Permeability and pollutant retention are the major properties which should be investigated in this context for barrier evaluation. Considering clay barriers in contact with waste leachates, they may be saturated by solutes of various chemical compositions, including in particular toxic heavy metals. In this context, the expansive Fo-Ca clay, a natural Ca-smectite from the Paris basin of Ypersian (Sparnacian) age, was chosen because of its very low permeability and ability for pollutant retention through cationic exchanges. The smectic is associated with kaolinite (up to 20%), and minor quartz, calcite, goethite and gypsum.

RSC Advances, 2016

The removal of a Pharmaceutically Active Compound (PhAC) pool using a well referenced clay minera... more The removal of a Pharmaceutically Active Compound (PhAC) pool using a well referenced clay mineral from Wyoming (SWy-2) as a geosorbent was studied for a better understanding of the environmental fate.

Applied Geochemistry, 2019

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

SSRN Electronic Journal, 2021

Arsenic is one of the more widespread toxic trace elements, whose presence in environment is link... more Arsenic is one of the more widespread toxic trace elements, whose presence in environment is linked either to geological background or human activities. The fate of arsenic in environmental compartments is closely linked to the microbial transformations of the inorganic species AsIII and AsV. In order to monitor the evolution of microbial As-related global activities, a simple batch test has been designed and applied. The principle of the test is based on the monitoring of oxidation of 1 mM AsIII in a basal medium inoculated with environmental samples. Results are interpreted considering of oxidation rate or rate constant, and lapse time. Several phenomena are likely to influence the global oxidation rate, such as the relative activity of diverse oxidizing microbes and the competition between oxidizing and reducing processes, in relation to organic matter bioavailability. AsIII oxidizing activities of microorganisms in eight surface soils from polluted sites were quantified with and...

Nowadays, subsurface waste disposal is based on the concept of compacted clay barriers, character... more Nowadays, subsurface waste disposal is based on the concept of compacted clay barriers, characterized by a low permeability and high cation retention. The aim of this experimental study is not only to reproduce at the laboratory scale the in-situ compaction of saturated clays, but also to focus on the evolution of the clay properties. Therefore, percolation experiments have been performed using an oedometer cell equipped with an injection system under constant pressure (Jullien et al., 2002). The chosen clay is the hectorite from Hector (California, USA), with the structural formula (Na0.25Ca0.04)(Mg2.74Li0.31)Si3.97O10(OH,F)2.nH2O. This hectorite is associated with minor calcite. For all experiments, the hectorite sample was compacted at 0.5 MPa, and then soaked at 0.3 MPa with deionised water or Ni(NO3)2 0.01 M solution. Moreover, Ni(NO3)2 solutions were injected in clays for two different initial water saturation degrees: Sr=0.3 (dry clay) and Sr=1 (water-saturated). Some mechani...

Pharmaceutical products (PPs) represent nowadays a common pollution in aquatic environments. The ... more Pharmaceutical products (PPs) represent nowadays a common pollution in aquatic environments. The PPs consumption have increased decade after decade all over the world leading to a pollution of numerous water compartments whereas no efficient water treatment has been done. Indeed, actual Waste-Water Treatment Plants (WWTPs) show limited solution in the removal of emerging organic micro-pollutants. A complete improvement of water treatment could be realistic if the associated treatment costs are controlled, Results of such unsuitable treatment drives to a constant overflow of numerous micro-pollutants, including PPs in natural waters. Today, this spillage has well-documented consequences on the biota, the human health, various ecosystems and shows a severe environment impact in general (Fent et al., 2006). Drugs concentrations vary between µg.L-1 and some ng.L-1. The entire aqueous environments are actually contaminated as shown by the abundant and various scientific publications on t...

International Journal of Environmental Research, 2020

The present study focused on the characterization of a multi-contaminated former industrial site,... more The present study focused on the characterization of a multi-contaminated former industrial site, followed by an investigation into the suitability of a possible phytoremediation technique. This study area located in Issoudun (France) was contaminated with high concentrations of trace elements such as copper (Cu), lead (Pb), zinc (Zn), and arsenic (As). The site was divided into 18 blocks, and soil samples (46 samples taken from the 18 blocks) were analyzed for pH, total organic matter (TOC), electrical conductivity (EC), total concentrations in Cu, Pb, Zn and As and granulometry. In a mesocosm experiment soil pore waters (SPWs) were collected from potted soil using rhizon samplers, at both the beginning (T0) and the end of the experiment (TF), with pH, EC and dissolved organic carbon (DOC) being determined directly from the SPW solutions. Cu, Pb, Zn and As concentrations in SPW as well as aboveground and belowground organs of Phaseolus vulgaris were also analyzed. The two main results are shown in this study. Firstly, the physico-chemical properties of the soil revealed the heterogeneity of the area, in particular for blocks 1, 2, 17 and 18. Secondly, the mesocosm phytotoxicity test using Phaseolus vulgaris showed that metal(loid)s plant accumulation depended not only on the soil metal(loid) concentrations, but also on soil pH and sand content. Moreover, Phaseolus vulgaris plants presented a homogeneous growth indicating that the area was able to sustain plant growth. These results revealed that a phytoremediation technique could be applied in this contaminated site.

Clay Minerals, 2017

The percolation of water through waste landfills produces leachates with high concentrations of w... more The percolation of water through waste landfills produces leachates with high concentrations of which can generate -exchanged clays within geochemical barriers. These leachates also contain several volatile organic compounds (VOCs) which can interact with the clay barrier. The aim of the present study was to characterize the sorption of eight short-chain VOCs (acetonitrile, methyl tert-butyl ether, dichloromethane, benzene, phenol, ethanol, acetone and aniline) on -smectite, and to identify their sorption mechanisms. The samples treated were characterized by carbon and nitrogen elemental analysis, infrared spectroscopy, powder X-ray diffraction, and thermogravimetric analysis. For acetonitrile, methyl tert-butyl ether, dichloromethane and benzene, no sorption was detected. Phenol, ethanol and acetone were sorbed very weakly, through Van der Waals interactions. Aniline molecules were sorbed strongly on -smectite mainly with hydrogen bonds between aniline and interlayer water molecule...

Data Revues 16310713 03360014 04002081, Dec 2, 2008

Ultimate wastes, resulting from the incineration of municipal solid wastes, contain high amounts ... more Ultimate wastes, resulting from the incineration of municipal solid wastes, contain high amounts of toxic elements that require stabilization before storage. However, whatever the stabilization processed involved, characterization of their crystal chemistry is essential. In this paper, the authors present a method which allows the determination of the mineralogy of ultimate wastes in detail. They present here an example of results from an ultimate waste, resulting from electrofiltration of fumes. This method is based on grain size and density separations coupled with X-ray diffraction, ICP-ES, ICP-MS, wet chemical methods and electron microprobe analyses. Despite the complexity of this waste, they show that it is possible, not only to determine its mineralogy, but also to give the modal proportions of each phase, and to provide some insights into the crystal chemistry of the main pollutants of this ultimate waste product.

$Research paper thumbnail of Etude par diffraction X aux petits angles des interactions lixiviats-argiles: Conception d'une cellule oedométrique sous faisceau$

L'une des applications environnementales majeures des materiaux argileux est la mise en œuvre... more L'une des applications environnementales majeures des materiaux argileux est la mise en œuvre des structures d'etancheite qui devront immobiliser ou retarder le transfert d'elements polluant des sols. Ces contaminants peuvent etre des elements lourds (Fe, Cu, Pb, Ba, ...) ou de la matiere organique. Les interactions argile - polluant qui conduisent a des remaniements structuraux peuvent alterer les proprietes d'etancheite des materiaux argileux mis en œuvre. Les applications concernent en particulier les barrieres passives des centres de stockage de dechets. L'objectif du projet que nous presentons est de definir les performances a long terme des materiaux utilises pour mettre en œuvre ces barrieres. Nous etudions actuellement la faisabilite d'un dispositif permettant d'analyser le comportement de materiaux argileux susceptibles d'etre utilises sur les sites de stockage. Le controle des mecanismes de transfert sera etudie en couplant a la technique de Diffusion aux Petits Angles une chambre d'infiltration a pression uniaxiale pour suivre l'evolution micro-structurale des echantillons. Les etudes de laboratoire seront menees d'abord sur des mineraux argileux de reference, lessives par des lixiviats modeles puis sur des echantillons naturels en situation.

Marine Chemistry, 2016

Organic matter-clay interaction along a seawater column of the Eastern Pacific upwelling system (... more Organic matter-clay interaction along a seawater column of the Eastern Pacific upwelling system (Antofagasta bay, Chile): Implications for source rock organic matter preservation,

Organic Geochemistry

Investigation of organic matter (OM) preservation mechanisms is crucial for understanding organic... more Investigation of organic matter (OM) preservation mechanisms is crucial for understanding organic accumulation in sedimentary environments. We focus here on the contribution of organo-clay interaction in such preservation. Most studies addressing this issue deal with organo-mineral complexes which have settled, omitting consideration of early aggregation within the water column. We therefore investigated the sorption of OM on montmorillonite (Na MMt) and kaolinite (Kaol) immersed in a permanently stratified water column (Lake Pavin, France). The two types of clay samples were kept immersed for different lengths of time and characterized via analytical methods suited for the organic phase [pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS), GC-MS, Fourier transform infrared spectroscopy (FT-IR) and dissolved organic carbon (DOC) analysis, as well as for the mineral phase [X ray diffraction (XRD) and microprobe elementary cartography]. Results suggest that strong organo-clay interaction occurred within the water column to a varying extent depending on water physicochemical conditions and the mineral phase typology. A higher concentration of DOC was observed in the proximal environment of the clay traps, suggesting an attractive effect induced by the clay minerals. Lipid compounds sorbed during the immersion were essentially fatty acids and aromatic compounds. Their distributions were closer to a phytoplankton signature than allochtonous pedogenetic OM. The sorption was particularly efficient in the O 2 transition zone, with a greater amount of OM on Na-MMt than Kaol. This was principally due to the high specific surface area and cationic exchange capacity (CEC) of the 2/1 clay mineral. Besides, XRD characterization revealed an

The Science of the total environment, Jan 15, 2016

Destruction of chemical munitions from World War I has caused extensive local top soil contaminat... more Destruction of chemical munitions from World War I has caused extensive local top soil contamination by arsenic and heavy metals. The biogeochemical behavior of toxic elements is poorly documented in this type of environment. Four soils were sampled presenting different levels of contamination. The range of As concentrations in the samples was 1937-72,820mg/kg. Concentrations of Zn, Cu and Pb reached 90,190mg/kg, 9113mg/kg and 5777mg/kg, respectively. The high clay content of the subsoil and large amounts of charcoal from the use of firewood during the burning process constitute an ample reservoir of metals and As-binding materials. However, SEM-EDS observations showed different forms of association for metals and As. In metal-rich grains, several phases were identified: crystalline phases, where arsenate secondary minerals were detected, and an amorphous phase rich in Fe, Zn, Cu, and As. The secondary arsenate minerals, identified by XRD, were adamite and olivenite (zinc and copper...