KUMPIENE, Jurate; FITTS, Jeffrey P.; MENCH, Michel

doi:10.1016/j.envpol.2012.02.016

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KUMPIENE, Jurate
Division of Waste Science and Technology

FITTS, Jeffrey P.
Environmental Sciences Department

MENCH, Michel
Biodiversité, Gènes & Communautés [BioGeCo]

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Article de revue

Ce document a été publié dans

Environmental Pollution. 2012, vol. 166, p. 82-88

Elsevier

Résumé en anglais

Aided phytostabilization using a combination of compost, zerovalent iron grit and coal fly ash (CZA) amendments and revegetation effectively promoted the biological recovery of mining spoils generated at a gold mine in Portugal. Selective dissolution of spoil samples in combination with solid phase characterization using microbeam X-ray absorption near edge structure (μXANES) spectroscopy and microbeam X-ray fluorescence (μXRF) mapping were used to assess As associations in spoils ten years after CZA treatment. The results show that As preferentially associates with poorly crystalline Fe-oxyhydroxides as opposed to crystalline Fe-(oxyhydr)oxide phases. The crystalline Fe(III)-phases dominated in the treated spoil and exceeded those of the untreated spoil three-fold, but only 2.6–6.8% of total As was associated with this fraction. Correlation maps of As:Fe reveal that As in the CZA-treated spoils is primarily contained in surface coatings as precipitates and sorbates. Arsenic binding with poorly crystalline Fe-oxyhydroxides did not inhibit As uptake by plants.< Réduire

Mots clés

iron

XANES

déchet minier

Mots clés en anglais

selective dissolution

μXRF mapping