title: Effect of fresh and mature organic amendments on the phytoremediation of technosols contaminated with high concentrations of trace elements.
abstract: Organic compounds resulting from the decomposition of organic amendments are used in the remediation of trace element (TE) contaminated soils. The mobility, phytoavailability and soil exposure intensity of molybdenum (Mo), chromium (Cr), zinc (Zn), copper (Cu), Cobalt (Co) and Arsenic (As) were evaluated in the phytoremediation of contaminated technosols after the addition of two organic matter types, fresh ramial chipped wood (RCW) and composted sewage sludge (CSS). The experiment consisted of nine main treatment blocks: (A) 3X unamended soil (NE), (B) 3X soil amended with RCW and (C) 3X soil amended with mature CSS. Total dissolved TE concentrations were determined in soil pore water (SPW) sampled by Rhizon samplers. The soil exposure intensity was assessed by standard Chelex 100 DGT (diffusive gradient in thin films) probes. TE phytoavailability was characterized by growing dwarf beans on potted soils and analyzing their foliar TE concentrations. The results of the present study indicate that the addition of fresh RCW and CSS has a positive effect on contaminated technosols. RCW decreased the mobility of all the studied TE in the SPW, whereas CSS reduced the mobility of Mo, Cr and Co, while it increased the mobility of Zn, Cu and As compared with the NE soil. The Zn soil exposure intensity assessed by DGT was not significantly changed by the addition of RCW and CSS, while the Cr soil exposure intensity was significantly decreased after RCW addition compared with the soil treated with CSS and the NE soil. In contrast Cu and Co were non labile in the three soils. Both RCW and CSS decreased the foliar concentration and the mineral mass of Mo, Zn, Cr, As and Co in the bean leaves but increased the foliar Cu concentration.
authors.affiliation: ISTO, UMR 7327 - CNRS/Université d'Orléans, Campus Géosciences, 1A, Rue de la Férollerie, 45071 Orléans Cedex 2, France; Université d'Orléans, UFR-Faculté des Sciences, Laboratoire de Biologie des Ligneux et des Grandes Cultures, UPRES EA 1207, Rue de Chartres, BP 6759, F-45067 Orléans Cedex 02, France. Electronic address: nour.hattab@univ-orleans.fr.
authors.forename: Nour
authors.initials: N
authors.lastname: Hattab
authors.affiliation: ISTO, UMR 7327 - CNRS/Université d'Orléans, Campus Géosciences, 1A, Rue de la Férollerie, 45071 Orléans Cedex 2, France.
authors.forename: Mikael
authors.initials: M
authors.lastname: Motelica-Heino
authors.affiliation: Ecole Nationale Supérieure des Mines de Saint-Etienne, Département SPIN, Laboratoire GéoSciences & Environnement, 158 Cours Fauriel, F-42023 Saint Etienne Cedex 2, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Faure
authors.affiliation: Ecole Nationale Supérieure des Mines de Saint-Etienne, Département SPIN, Laboratoire GéoSciences & Environnement, 158 Cours Fauriel, F-42023 Saint Etienne Cedex 2, France.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Bouchardon
mesh_terms: D001673:Biodegradation, Environmental; D001682:Biological Availability; D003035:Cobalt; D005602:France; D008669:Metallurgy; D008670:Metals / Q000032:analysis* / Q000493:pharmacokinetics; D010944:Plants; D012722:Sewage; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D014131:Trace Elements / Q000032:analysis*; D014867:Water; D014934:Wood / Q000737:chemistry
chemical_list: D008670:Metals; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; D014131:Trace Elements; D014867:Water; D003035:Cobalt
keywords: Mobility; Organic amendment; Phytoavailability; Phytostabilisation; Soil contamination; Soil exposure intensity; Trace elements