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Article Dans Une Revue Environmental Chemistry Letters Année : 2024

Addition of compost to soils increases metal mobility in ultramafic New Caledonian ferralsols

Perrine Klein
Hélène Kaplan
  • Fonction : Auteur
Anthony Pain
  • Fonction : Auteur
Frédéric Feder
  • Fonction : Auteur
Audrey Léopold
  • Fonction : Auteur

Résumé

Compost addition to soil improves soil fertility, valorizes organic wastes and is expected to decrease the mobility of toxic metals by sequestration into soil organic matter. On the contrary, we hypothesized here that compost addition may increase metal mobility in metal-rich soils. For that, we studied the mobility of copper, zinc, nickel and chromium in Ferralsols by kinetic extraction with ethylenediaminetetraacetic acid. Results show an increase in the extractable metal pools in the compost-amended Ferralsols, amounting up to 500 mg of nickel per kg and 100 mg of chromium per kg, representing 10% and 1% of the total concentrations. The enhanced mobility of nickel and chromium arise most probably from soil properties, while the enhanced mobility of copper and zinc should mainly originate from compost properties. We conclude that addition of compost may induce the release of toxic metals in substantial amounts under specific conditions.
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Dates et versions

hal-04245288 , version 1 (17-10-2023)

Identifiants

Citer

Perrine Klein, Farid Juillot, Hélène Kaplan, Anthony Pain, Frédéric Feder, et al.. Addition of compost to soils increases metal mobility in ultramafic New Caledonian ferralsols. Environmental Chemistry Letters, 2024, 22, pp.57-62. ⟨10.1007/s10311-023-01650-x⟩. ⟨hal-04245288⟩
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