Kinetic extractions to assess mobilization of Zn, Pb, Cu, and Cd in a metal-contaminated soil: EDTA vs. citrate.

Labanowski , Jérome
        INRA
        , Versailles .
         UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés; Monna , Fabrice
        . Univ. de Bourgogne Centre des Sciences de la Terre; Bermond , Alain
        INRA
        , Thiverval-Grignon .
         UMR 1091 Environnement et Grandes Cultures; Cambier , Philippe
        INRA
        , Versailles .
         UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés; Fernandez , Christelle
        INRA
        , Versailles .
         UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés; Lamy , Isabelle
        INRA
        , Versailles .
         UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés; Van Oort , Folkert
        INRA
        , Versailles .
         UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés

Kinetic extractions to assess mobilization of Zn, Pb, Cu, and Cd in a metal-contaminated soil: EDTA vs. citrate.

2008

Labanowski , Jérome (INRA , Versailles (France). UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés) | Monna , Fabrice (Centre National de la Recherche Scientifique, Dijon(France). Univ. de Bourgogne Centre des Sciences de la Terre) | Bermond , Alain (INRA , Thiverval-Grignon (France). UMR 1091 Environnement et Grandes Cultures) | Cambier , Philippe (INRA , Versailles (France). UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés) | Fernandez , Christelle (INRA , Versailles (France). UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés) | Lamy , Isabelle (INRA , Versailles (France). UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés) | Van Oort , Folkert (INRA , Versailles (France). UR 0251 Physico-chimie et Ecotoxicologie des Sols d'agrosystèmes contaminés)

Kinetic EDTA and citrate extractions were used to mimic metal mobilization in a soil contaminated by metallurgical fallout. Modeling of metal removal rates vs. time distinguished two metal pools: readily labile (QM1) and less labile (QM2). In citrate extractions, total extractability (QM1 + QM2) of Zn and Cd was proportionally higher than for Pb and Cu. Proportions of Pb and Cu extracted with EDTA were three times higher than when using citrate. We observed similar QM1/QM2 ratios for Zn and Cu regardless of the extractant, suggesting comparable binding energies to soil constituents. However, for Pb and Cd, more heterogeneous binding energies were hypothesized to explain different kinetic extraction behaviors. Proportions of citrate-labile metals were found consistent with their short-term, in-situ mobility assessed in the studied soil, i.e., metal amount released in the soil solution or extracted by cultivated plants. Kinetic EDTA extractions were hypothesized to be more predictive for long-term metal migration with depth.

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