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

Klein Perrine, Gunkel-Grillon Peggy, Juillot Farid, Kaplan Hélène, Pain Anthony, Feder Frédéric, Leopold Audrey. 2024. Addition of compost to soils increases metal mobility in ultramafic New Caledonian ferralsols. Environmental Chemistry Letters, 22 : 57-62.

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.

Mots-clés Agrovoc : ferralsol, fertilité du sol, compost, métal lourd, amendement du sol, chimie du sol

Mots-clés géographiques Agrovoc : Nouvelle-Calédonie, France

Mots-clés libres : Compost, Ferralsols, EDTA, Kinetic extractions, Extractable pools, Ni remobilization, Cr remobilization

Classification Agris : P33 - Chimie et physique du sol
Q70 - Traitement des déchets agricoles
P02 - Pollution

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement hors UE : Agence de l'Environnement et de la Maîtrise de l'Energie, COGES South Province

Auteurs et affiliations

• Klein Perrine, CIRAD-PERSYST-UPR Recyclage et risque (NCL) - auteur correspondant
• Gunkel-Grillon Peggy, UNC (NCL)
• Juillot Farid, IRD (NCL)
• Kaplan Hélène, IAC (NCL)
• Pain Anthony, IAC (NCL)
• Feder Frédéric, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0001-8434-5193
• Leopold Audrey, IAC (NCL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/606535/)

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