Journal
ENVIRONMENTAL POLLUTION
Volume 174, Issue -, Pages 63-70Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.10.027
Keywords
EDTA soil washing; Toxic metals; Metal bio-availability; Metal phyto-accumulation; Soil functioning
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Funding
- Slovenian Research Agency [J4-3609]
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The effect of remediation using three EDTA doses (10, 30, 60 mmol kg(-1)) on soil functioning was assessed using column experiment and Brassica rapa. Soil washing removed up to 77, 29 and 72% of metals from soil contaminated with 1378, 578 and 8.5 mg kg(-1) of Pb, Zn and Cd, respectively. Sequential extraction indicated removal from the carbonate soil fraction. Metal oral-accessibility from the stomach phase was reduced by up to 75 and from the small intestine by up to 79% (Pb). Part of metals (up to 0.8% Cd) was lost due to leaching from columns. Remediation reduced toxic metal soil-root transfer by up to 61% but did not prevent metal accumulation in leaves. The fitness of plants grown on EDTA washed soils (gas exchange, fluorescence) was not compromised. Remediation initially reduced the soil DNA content (up to 29%, 30 mmol kg(-1) EDTA) and changed the structure of microbial population. (C) 2012 Elsevier Ltd. All rights reserved.
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