Klein P. auteur aut IRD Gunkel-Grillon P. auteur aut IRD Juillot Farid auteur aut IRD Kaplan H. auteur aut IRD Pain A. auteur aut IRD Feder F. auteur aut IRD Léopold A. auteur aut IRD text journalArticle eng text/pdf born digital access 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. specialized Compost Ultramafic Ferralsols EDTA kinetic extraction Extractable pools Ni and Cr remobilization NOUVELLE CALEDONIE 068 076 020 22 57-62 2024 1610-3653 https://www.documentation.ird.fr/hor/fdi:010090254 10.1007/s10311-023-01650-x 1610-3653 [F B010090254] https://www.documentation.ird.fr/hor/fdi:010090254 https://www.documentation.ird.fr/intranet/publi/2023-11/010090254.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2023-11-10 2025-11-06 fdi:010090254 fre