References of "Liénard, Amandine"
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See detailSoil contamination near a former Zn-Pb ore-treatment plant: Evaluation of deterministic factors and spatial structures at the landscape scale
Liénard, Amandine ULg; Brostaux, Yves ULg; Colinet, Gilles ULg

in Journal of Geochemical Exploration (in press)

Historical soil contamination within a 3 km radius of a former ore treatment plant was evaluated. A total of 247 topsoil samples were collected in a stratified random sampling design taking into account ... [more ▼]

Historical soil contamination within a 3 km radius of a former ore treatment plant was evaluated. A total of 247 topsoil samples were collected in a stratified random sampling design taking into account three factors: land use (LU), soil type (ST) and wind direction (WD). Concentrations of trace elements (Cd, Co, Cr, Cu, Ni, Pb and Zn) and major elements (Ca, Mg, K, Fe, Al, Mn) as well as various soil properties (pHwater, pHKCl, TOC and N) were measured. Total Cd, Pb and Zn concentrations were higher than typical background values. Enrichment factors for these three metals were, respectively, 260, 77.4 and 35.5. Principal components analysis (PCA) and factor analysis segregated anthropogenic contamination as a premier factor in influencing concentrations, followed by a second lithogenic factor. The anthropogenic origin of substantial contamination was confirmed though mapping of sample locations relative to contaminant sources. Factor 1 (26.5% of the variance) impacts a large area around the contaminated site and is also indicative of WD influence. Factor 2 (23.9% of the variance) is naturally linked to the local lithology and geology. LU and soil fertility are, respectively, represented by factor 3 (16.5% of the variance), which is linked to pH, and factor 4 (9.3% of the variance), related to organic content. The significance of landscape factors in the spatial distribution of metallic trace elements (MTE) was assessed with an ANCOVA using “distance to the source” as a covariate. Results of the analysis support the hypothesis that Cd, Cu, Pb and Zn concentrations are mainly driven by anthropogenic factors, specifically historical industrial activity at the former ore treatment plant. The ANCOVA also provides a means to quantify the impact of LU and ST as well, particularly on MTE availability in soils. The presence of MTE in soil poses known, and potentially significant, risks to both human health and the environment. [less ▲]

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See detailSynthèse bibliographique sur la mobilité des éléments traces dans les sols et l’utilisation de la stabilisation physico-chimique comme technique de gestion in situ des sites contaminés
Liénard, Amandine ULg; Colinet, Gilles ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(2), 273-289

Industrial activities have deeply impacted the quality of biophysical environment at places. This review focuses on consequences of soil contaminations by metallic trace elements: what conditions the ... [more ▼]

Industrial activities have deeply impacted the quality of biophysical environment at places. This review focuses on consequences of soil contaminations by metallic trace elements: what conditions the mobility of contaminants in soils and what are the remediation practices based upon physico-chemical stabilization? This technique is an in situ remediation which aims at limiting the dispersion of metals in the environment by use of soil conditioners and amendments in contaminated sites. First of all, we reviewed the concepts of mobility of trace elements and their indicators. Then, we compiled the different kinds of amendments applied to stabilize contaminants in soils and the processes involved. [less ▲]

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See detailEffects of Eisenia fetida on metal uptake of heavy metals from polluted soils by Vicia faba and Zea Mays
Lemtiri, Aboulkacem ULg; Liénard, Amandine ULg; Francis, Frédéric ULg et al

Poster (2014, February 26)

Earthworms are known to increase availability of heavy metals in soils and also play an important role in maintaining the structure and quality of soil. The introduction of earthworms into soils ... [more ▼]

Earthworms are known to increase availability of heavy metals in soils and also play an important role in maintaining the structure and quality of soil. The introduction of earthworms into soils contaminated with metals has been suggested as an aid for phytoremediation processes. In Belgium (Wallonia), a century of industrial metallurgic activities produced significant heavy metal soil pollution. A large q u a n t i t y o f s m e l t e r w a s t e c r e a t e d a g r a d i e n t o f zi n c, lead and cadmium c o n c e n t r a t i o n . The objectives of our study were to evaluate : (i) the potential toxicity of heavy metal elements on the epigeic earthworms Eisenia fetida and on two plants Zea mays and Vicia faba and (ii) to determine the effects of the earthworms on the growth and contaminants phytoextraction process. The combination of behavioural factor measurements (survival, growth, reproduction of earthworms), physico-chemical parameters such as metal absorption, bioaccumulation by earthworms, soil physico-chemical changes, and plant responses (root and shoot elongation, dried biomass,…) provided a valuable indication of pollutant bioavailability and ecotoxicity. After 56-days exposure, the results suggest that adult earthworms have a strong tolerance for heavy metals exposure, but the responses depend on metal elements. Earthworms modify the bioavailable heavy metals in root and shoot in the contaminated soils and their activities alter shoot and root biomass of V. faba and Z. mays. The presence of earthworms led to a change in physico-chemical caracteristics in contaminated soils. These results show that the ecological context for phytoremediation should be broadened by considering earthwom – plant – soil interactions as they influence both plant health and absorption of heavy metals. [less ▲]

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See detailSpatial distribution of metallic trace elements in soils contaminated by atmospheric fallouts
Liénard, Amandine ULg

Scientific conference (2012, November 26)

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See detailSpatial distribution of metallic trace elements in soils contaminated by atmospheric fallouts. Case study: Sclaigneaux (Belgium)
Liénard, Amandine ULg; Colinet, Gilles ULg; Dere, Christelle ULg

Conference (2012, July 03)

The valleys of Sambre and Meuse in Wallonia hosted numerous metal ore treatment factories. They engendered a contamination of soils by metallic trace elements that may migrate in the landscape through ... [more ▼]

The valleys of Sambre and Meuse in Wallonia hosted numerous metal ore treatment factories. They engendered a contamination of soils by metallic trace elements that may migrate in the landscape through erosion, lixiviation, biological transportation, aso. We investigated the spatial distribution of some metallic trace elements in soils around a former zinc-ore treatment plant to a distance of 3km. The sampling strategy aimed at (i) verifying that the main source of trace elements was the plant chimney, (ii) assessing the impact of the wind directions on fallout dispersion and (iii) evaluating whether there were differences of contents according to soil types and to soil occupation. Two hundred and fifty topsoil samples were collected according to a stratified design dealing with distance to the chimney, direction of dominant winds, soil type, and land use. Pseudo-total contents in inorganic elements, pH, TOC, and N were determined in the laboratory. Besides, classical statistical analysis (i) ANCOVA (three-way ANOVA with the distance as a co-variate) and (ii) Principal Component Analysis were also performed. First results show that (i) zinc, lead and cadmium contents are closely correlated to each other and (ii) negatively correlated with the distance. If the geographical location is the major driving factor of trace elements contents in soils, significant differences were also found between soil type and land use (p-value<0.05). The highest MTE concentrations were associated with North-East winds, forest cover and pebbles rich soils. Further investigations will concern the vertical and toposequential distributions, and the speciation of MTE. [less ▲]

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See detailEvaluation of the pedogenesis effects on the fractionation of metallic trace elements in solid wastes from industrial activities
Pineux, Nathalie ULg; Liénard, Amandine ULg; Cloots, Rudi ULg et al

Poster (2011, July 04)

This work aims at contributing to a better knowledge of the reactivity of metal-bearing phases to evaluate the risks of metal trace elements (MTE) transfers in soil-plant-water system. The high proportion ... [more ▼]

This work aims at contributing to a better knowledge of the reactivity of metal-bearing phases to evaluate the risks of metal trace elements (MTE) transfers in soil-plant-water system. The high proportion of the MTE on this type of sites seems to be mobilized only by particularly aggressive conditions but unstable bearing mineral phases have also been observed in smaller proportions. [less ▲]

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See detailA Methodology for Sampling Design dedicated to the Evaluation of Effects of Soil Type and Land Use on the Fate of Metallic Trace Elements in Contaminated Soils
Liénard, Amandine ULg; Bock, Laurent ULg; Colinet, Gilles ULg

Poster (2011, July 04)

Contaminated soils may present a risk to human health and the environment. The aim of this study is to evaluate the fate of metallic trace elements (Cd, Pb and Zn) brought to soils from atmospheric ... [more ▼]

Contaminated soils may present a risk to human health and the environment. The aim of this study is to evaluate the fate of metallic trace elements (Cd, Pb and Zn) brought to soils from atmospheric fallouts according to soil type and land use. We have developed a sampling soil strategy in order to both map soil contaminations and assess the effects of soils and land use on the mobility of MTE. [less ▲]

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