Feasilbility of phytoextraction to remediate cadmium and zinc contaminated soils

G.F. Koopmans, P.F.A.M. Romkens, M.J. Fokkema, J. Song, Y.M. Luo, J. Japenga, F.J. Zhao

Research output: Contribution to journalArticleAcademicpeer-review

72 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)905-914
JournalEnvironmental Pollution
Volume156
Issue number3
DOIs
Publication statusPublished - 2008

Keywords

  • hyperaccumulator thlaspi-caerulescens
  • metal-accumulating plants
  • polluted soils
  • heavy-metals
  • sandy soil
  • zn
  • cd
  • phytoremediation
  • rhizosphere
  • field

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