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Research paper thumbnail of Effect of organic amendments on the mobility of trace elements in phytoremediated techno-soils: role of the humic substances
Environmental science and pollution research international, 2014
The efficiency of aided phytostabilization using organic amendments such as ramial chipped wood (... moreThe efficiency of aided phytostabilization using organic amendments such as ramial chipped wood (RCW) and composted sewage sludge (CSS) was studied on contaminated techno-soils, on nine experimental plots. The objective was to characterize the role of fulvic (FA) and humic acids (HA) on the mobilization of trace elements, specifically As, Cu, Mo, Pb and Zn. Results showed that the addition of CSS increased the total organic carbon and nitrogen content more than with RCW and as a result, the C/N ratio in the CSS soil was higher than in the RCW and non-amended (NE) soil, reflecting the high decomposition of soil organic matter in the CSS soil compared with the other soils. The RCW and CSS amendments increased the hydrogen index (HI) values and the oxygen index (OI) values compared with the NE soil, especially for the soil treated with CSS which contained more aliphatic than aromatic compounds. The addition of CSS to the techno-soil significantly increased the percentage of C org assoc...
Research paper thumbnail of Potentially toxic element phytoavailability assessment in Technosols from former smelting and mining areas
Potentially toxic element phytoavailability assessment in Technosols from former smelting and mining areas
Environmental Science and Pollution Research, 2014
This study reports the chemical bioavailability of several potentially toxic elements (Zn, Pb, Cd... moreThis study reports the chemical bioavailability of several potentially toxic elements (Zn, Pb, Cd, As, and Sb) in contaminated Technosols from two former smelting and mining areas. Though these elements have long been recognized as potentially harmful elements, understanding of their toxicity and environmental behavior in Technosols developed on former mining and smelting sites are more limited, particularly for As and Sb. Surface soils were sampled from metallophyte grassland contaminated with Zn, Pb, and Cd located at Mortagne-du-Nord (North France) and from a former mining settling basin contaminated with As, Pb, and Sb located at la Petite Faye (Limoges, France). Various selective single extraction procedures (CaCl2, NaNO3, NH4NO3, DTPA, and EDTA) were used together with germination tests with dwarf beans whose shoots were analyzed for their potentially toxic element concentrations after 21 days of growth. The extraction capacity of the potentially toxic elements followed the order EDTA > DTPA > NH4NO3 > CaCl2 > NaNO3 for both studied areas. Pearson's correlation coefficient analysis between the concentrations of potentially toxic elements accumulated in bean primary leaves or their mineral mass with their extractable concentrations showed a positive significant correlation with dilute CaCl2 and nitrate solutions extraction procedures. In contrast, for all studied elements, except Pb, the complexing and chelating extractants (EDTA and DTPA) exhibited poor correlation with the dwarf bean leaves concentrations. Moreover, results showed that the 0.01 M CaCl2 extraction procedure was the most suitable and provided the most useful indications of metal phytoavailability for studied elements.
Research paper thumbnail of Environmental and health risk assessment of Pb, Zn, As and Sb in soccer field soils and sediments from mine tailings: solid speciation and bioaccessibility
Environmental Science and Pollution Research, 2014
Areas polluted by the persistent presence of metal(loid)s induce health problems, especially when... moreAreas polluted by the persistent presence of metal(loid)s induce health problems, especially when recreational activities (on land or water) promote human exposure to the pollutants. This study focuses on one of the most encountered worldwide mining waste, i.e. those from the extraction of Pb-Zn-Ag. The representative Pb-Zn-rich tailing (about 64, 100 m 3 ) sampled is located near a soccer field and a famous river for fishing. The scientific interests is relative to: (1) mobility and bioaccessibility of metal(oid)s, (2) human risk assessments and (3) relationship between human risks and solid-bearing phases in the environment. Soccer field soils, tailings and sediments from the nearby river were sampled; moreover, metal(loid) speciation (from BCR experiments) and bioaccessibility were measured and solid speciation performed by X-ray diffraction and electron microscopy in order to highlight metal(loid) dispersion and impact. Results demonstrate that the soccer field is highly contaminated by Pb, Zn, As and Sb due primarily to waste runoff. In terms of risk assessment, Pb and As human bioaccessibility highlights the major health risk (48 and 22.5 % of human bioaccessibility, respectively). Since local populations are regularly in close contact with metal(loid)s, the health risk due to pollutant exposure needs to be reduced through sustainable waste disposal and the rehabilitation of polluted sites.
Research paper thumbnail of Magnetic characterization of ferrichromite in soils developed on serpentinites under temperate climate
Geoderma, 2014
The objective of this study is to characterize alteration processes of iron chromium spinels in s... moreThe objective of this study is to characterize alteration processes of iron chromium spinels in soils developed on serpentinites using their magnetic properties. Three pedons developed on serpentinites from two European Hercynian massifs were considered. Two soils from the central Massif (France) are formed under mild and humid climate, the third soil is located under colder and dryer climate zone (Szklary Massifsouth western Poland). The most of magnetic carriers of serpentinites belong to the iron chromium spinel group. These minerals have been characterized by studying rock and soil magnetic parameters i.e. magnetic susceptibility and low field thermomagnetic behavior. Chemical composition of soils and rocks was investigated by ICP-MS and ICP-AES. The nature of magnetic minerals and the geochemical behavior of iron and chromium in soils depend on hydrothermal and/or metamorphic previous alteration of the parent rocks. The presence of zoned ferrichromite is related to dissociate behaviors of iron and chromium during pedogenesis. In both soil profiles from France the pedogenic alteration of magnetic carriers is limited to a slight conversion of magnetites to maghemites in the upper horizons. In Polish soil developed under colder and dryer conditions, the magnetic minerals remain unaltered even in topsoil horizon.

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