Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/1534
Title: Evaluation of cyclonic ash, commercial Na-silicates, lime and phosphoric acid for metal immobilisation purposes in contaminated soils in Flanders (Belgium)
Authors: GEEBELEN, Wouter 
Sappin-Didier, V.
RUTTENS, Ann 
CARLEER, Robert 
YPERMAN, Jan 
Bongue-Boma, K.
Mench, M.
VAN DER LELIE, Daniel 
VANGRONSVELD, Jaco 
Issue Date: 2006
Publisher: Elsevier
Source: ENVIRONMENTAL POLLUTION, 144(1). p. 32-39
Abstract: In order to reduce the health risks associated with historically enriched metal smelting sites in Flanders (Belgium), the capacities of a non-beringite cyclonic ash and commercial Na-silicates to fix metals and create conditions to restore vegetation cover were evaluated and compared to lime and H3PO4. All tested amendments reduced Ca(NO3)(2)-extractable soil metal concentrations and reduced metal uptake in Agrostis capillaris seedlings. Sodium released by Na-silicates was possibly toxic to bean plants while an isotopic dilution technique revealed that metals were only weakly sorbed by silicates (i.e. reversible sorption). Cyclonic ash appeared more efficient than lime in both reducing oxidative stress in beans and Zn, Cu and Ph uptake in grasses. The metal fixing mechanism for both amendments appeared similar (i.e. irreversible fixation at constant pH), in contrast to H3PO4 where at least part of the immobilised Cd was irreversibly fixed across a range of pH.
Keywords: cadmium; isotopic dilution; isotopic exchange kinetics; phytotoxicity
Document URI: http://hdl.handle.net/1942/1534
ISSN: 0269-7491
e-ISSN: 1873-6424
DOI: 10.1016/j.envpol.2006.01.013
ISI #: 000241138100006
Category: A1
Type: Journal Contribution
Validations: ecoom 2007
Appears in Collections:Research publications

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