The effectiveness of phosphate treatment for Cd, Cu, Pb, and Zn immobilization in mine waste soils was examined using batch conditions. Application of synthetic hydroxyapatite (HA) and natural phosphate rock (FAP) effectively reduced the heavy metal water solubility generally by about 84-99%. The results showed that HA was slightly superior to FAP for immobilizing heavy metals. The possible mechanisms for heavy metal immobilization in the soil involve both surface complexation of the metal ions on the phosphate grains and partial dissolution of the phosphate amendments and precipitation of heavy metal-containing phosphates. HA and FAP could significantly reduce Cd, Cu, Pb, and Zn availability in terms of water solubility in contaminated soils while minimizing soil acidification and potential risk of eutrophication associated with the application of highly soluble phosphate sources. (C) 2011 Elsevier Ltd. All rights reserved.

Evaluation of the effectiveness of phosphate treatment for the remediation of mine waste soils contaminated with Cd, Cu, Pb, and Zn / Mignardi, Silvano; Alessia, Corami; Ferrini, Vincenzo. - In: CHEMOSPHERE. - ISSN 0045-6535. - STAMPA. - 86:4(2012), pp. 354-360. [10.1016/j.chemosphere.2011.09.050]

Evaluation of the effectiveness of phosphate treatment for the remediation of mine waste soils contaminated with Cd, Cu, Pb, and Zn

MIGNARDI, Silvano;FERRINI, Vincenzo
2012

Abstract

The effectiveness of phosphate treatment for Cd, Cu, Pb, and Zn immobilization in mine waste soils was examined using batch conditions. Application of synthetic hydroxyapatite (HA) and natural phosphate rock (FAP) effectively reduced the heavy metal water solubility generally by about 84-99%. The results showed that HA was slightly superior to FAP for immobilizing heavy metals. The possible mechanisms for heavy metal immobilization in the soil involve both surface complexation of the metal ions on the phosphate grains and partial dissolution of the phosphate amendments and precipitation of heavy metal-containing phosphates. HA and FAP could significantly reduce Cd, Cu, Pb, and Zn availability in terms of water solubility in contaminated soils while minimizing soil acidification and potential risk of eutrophication associated with the application of highly soluble phosphate sources. (C) 2011 Elsevier Ltd. All rights reserved.
2012
hydroxyapatite; phosphate rock; immobilization; mine waste soils; heavy metals
01 Pubblicazione su rivista::01a Articolo in rivista
Evaluation of the effectiveness of phosphate treatment for the remediation of mine waste soils contaminated with Cd, Cu, Pb, and Zn / Mignardi, Silvano; Alessia, Corami; Ferrini, Vincenzo. - In: CHEMOSPHERE. - ISSN 0045-6535. - STAMPA. - 86:4(2012), pp. 354-360. [10.1016/j.chemosphere.2011.09.050]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/399805
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