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Environ Pollut. 2008 Dec;156(3):905-14. doi: 10.1016/j.envpol.2008.05.029. Epub 2008 Jul 21.

Feasibility of phytoextraction to remediate cadmium and zinc contaminated soils.

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1
Department of Soil Quality, Wageningen University, Wageningen University and Research Centre (WUR), P.O. Box 47, 6700 AA, Wageningen, The Netherlands. gerwin.koopmans@wur.nl

Abstract

A Cd and Zn contaminated soil was mixed and equilibrated with an uncontaminated, but otherwise similar soil to establish a gradient in soil contamination levels. Growth of Thlaspi caerulescens (Ganges ecotype) significantly decreased the metal concentrations in soil solution. Plant uptake of Cd and Zn exceeded the decrease of the soluble metal concentrations by several orders of magnitude. Hence, desorption of metals must have occurred to maintain the soil solution concentrations. A coupled regression model was developed to describe the transfer of metals from soil to solution and plant shoots. This model was applied to estimate the phytoextraction duration required to decrease the soil Cd concentration from 10 to 0.5 mg kg(-1). A biomass production of 1 and 5 t dm ha(-1) yr(-1) yields a duration of 42 and 11 yr, respectively. Successful phytoextraction operations based on T. caerulescens require an increased biomass production.

PMID:
18644664
DOI:
10.1016/j.envpol.2008.05.029
[Indexed for MEDLINE]
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