Resiliency of metal behaviors in a ferralsol after an anoxic event simultaneous to rum vinasse amendment

Lahlah Yasmina, Renault Pierre, Buzet Aurélie, Cazevieille Patrick, Hazemann Jean-Louis, Cambier Philippe, Womes Manfred, Jumas Jean-Claude. 2007. Resiliency of metal behaviors in a ferralsol after an anoxic event simultaneous to rum vinasse amendment. In : 2007 ASA-CSSA-SSSA International Annual Meetings, November 4-8, 2007. ASA, CSSA, SSSA. s.l. : s.n., Résumé, 1 p. ASA-CSSA-SSSA International Annual Meetings, Louisiane, États-Unis, 4 November 2007/8 November 2007.

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Abstract : Spreading vinasse on soil enhances the risks of anaerobiosis, metal mobilization, and solid alterations. Our aims were to check whether the retum to aerobic conditions after an anaerobic event erases anaerobic effects on metal mobility and solid properties. Batch incubations of ferralsol slurry were performed according to the sequence aerobiosis (7 d) - anaerobiosis (0, 2, 7, 14, 21 or 28 d) - aerobiosis (28 d), rum vinasse being supplied at the beginning of anaerobiosis. Along the incubations, we characterized gases, organic and mineral solutes, and solids (Fe and Mn oxidation states, cation exchange capacity of the soil). Before anaerobiosis, metal concentrations in solution were low. During anaerobiosis, Fe and Mn were mobilized mainly from soil minerals, their concentrations reaching 4.05 and 6.20 mM, respectively. Thereafter, Fe was immobilized during the first 24 h of aerobiosis through oxidation. Although Mn immobilization was also important, it led to quickly stabilized concentrations of about 1 mM that probably resulted from equilibrium with solids without oxidation. In solids, up to about 35% of Fe was reduced during the 28 d of anaerobiosis, the return to aerobiosis enabling its partial or total re-oxidation in about 4 d. During anaerobiosis, K+, Pb2+, Ni2+, Ca2+ and Mg2+ were also mobilized, the vinasse amendment supplying 143, 120, 31, 56 and 50 % of their maximum concentration in solution, respectively. The variations in exchangeable K+, Ca2+ and Mg2+ suggest their partial exchange in anaerobiosis with mobilized Mn2+ and Fe2+, and it would have been probably the same for Pb2+ and Ni2+. This assumption is consolidated by positive correlations between Mn2+ and other metal concentrations, which could be simulated by a model of cation exchange. The soil cation exchange capacity also increased in anaerobiosis and does not return to its initial state after return to aerobic condition. (Texte intégral)

Mots-clés Agrovoc : Vinasse, Amendement du sol, Risque, Propriété physicochimique du sol, Élément métallique, Fer, Manganèse, Anaérobiose, Capacité d'échange ionique, Utilisation des déchets

Classification Agris : P33 - Soil chemistry and physics
F04 - Fertilizing

Auteurs et affiliations

  • Lahlah Yasmina, INRA (FRA)
  • Renault Pierre, INRA (FRA)
  • Buzet Aurélie, INRA (FRA)
  • Cazevieille Patrick, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
  • Hazemann Jean-Louis, CNRS (FRA)
  • Cambier Philippe, INRA (FRA)
  • Womes Manfred, CNRS (FRA)
  • Jumas Jean-Claude, CNRS (FRA)

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