|Reference : Spatial distribution of metallic trace elements in soils contaminated by atmospheric fal...|
|Scientific congresses and symposiums : Unpublished conference|
|Life sciences : Environmental sciences & ecology|
Life sciences : Agriculture & agronomy
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
|Spatial distribution of metallic trace elements in soils contaminated by atmospheric fallouts. Case study: Sclaigneaux (Belgium)|
|Liénard, Amandine [Université de Liège - ULg > Sciences et technologie de l'environnement > Science du sol >]|
|Colinet, Gilles [Université de Liège - ULg > Sciences et technologie de l'environnement > Science du sol >]|
|Dere, Christelle [Université de Liège - ULg > Sciences et technologie de l'environnement > Science du sol >]|
|4th International Congress EUROSOIL 2012 Soil Science for the Benefit for the Mankind and Environment|
|du 2 juillet 2012 au 7 juillet 2012|
|[en] Contamination ; metallic trace elements ; soil ; land use ; spacial distribution|
|[en] 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.
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