Heavy metal distribution between contaminated soil and Paulownia tomentosa, in a pilot-scale assisted phytoremediation study: Influence of different complexing agents

Abstract

a b s t r a c tThe distribution of Cd, Cu, Pb and Zn between a contaminated soil and the tree species Paulownia tomentosa was investigated in a pilot-scale assisted phytoremediation study. The influence of the addition of EDTA, tartrate and glutamate at 1, 5 and 10 mM concentrations on metal accumulation by the plant and on metal mobilization in soil was evaluated. Root/shoot metal concentration ratios were in the range of 3-5 for Zn, 7-17 for Cu, 9-18 for Cd and 11-39 for Pb, depending on the type and concentration of complexing agent. A significant enhancement of metal uptake in response to complexing agent application was mainly obtained in roots for Pb (i.e. 359 mg kg À1 for EDTA 10 mM and 128 mg kg À1 for the control), Cu (i.e. 594 mg kg À1 for glutamate 10 mM and 146 mg kg À1 for the control) and, with the exception of glutamate, also for Zn (i.e. 670 mg kg À1 for tartrate 10 mM and 237 mg kg À1 for the control). Despite its higher metal mobilization capacity, EDTA produced a metal accumulation in plants quite similar to those obtained with tartrate and glutamate. Consequently the concentration gradient between soil pore water and plant tissues does not seem to be the predominant mechanism for metal accumulation in Paulownia tomentosa and a role of the plant should be invoked in the selection of the chemical species taken up. Metal bioavailability in soil at the end of the experiment was higher in the trials treated with EDTA than in those treated with tartrate and glutamate, the latter not being significantly different from the control. These findings indicated the persistence of a leaching risk associated to the use of this chelator, while an increase of the environmental impact is not expected when glutamate and tartrate are applied.

Kadmiyum un Kirlenmiş Topraklardan Edta Tuzlarıyla Ekstraksiyonu Ve Spesiasyonu (Türlendirmesi)

“…Canlı ortama ulaşabilirlikleri toprakta bulundukları kimyasal türlerine bağlıdır [6]. Toprakların ağır metallerle kirlenmesi tüm dünyada yaygın bir problemdir ve kirlenmiş arazilerin düzgün bir şekilde yönetimi ya da ıslahının hem zor hem de maliyetli olduğu kanıtlanmıştır.…”

Effect of Surfactant on Adsorption and Mobility of Lead and Cadmium in Soils

“…Heavy metal contamination of soil is one of the most important environmental problems throughout the world (Doumett et al, 2008). The ability of heavy metals to accumulate and cause toxicity in biological systems-humans, animals, microorganisms and plants has been reported (D'amore et al, 2005).…”

Combined Analysis of mRNAs and miRNAs to Identify Genes Related to Biological Characteristics of Autotetraploid Paulownia

“…Polyploidy species usually exhibit greater vigor, have more biomass [1] and are more adaptable and tolerant to different environmental conditions than diploids [2,3]. Many woody plants, such as mulberry, jujube, and willow carry multiple copies of the same genome, are classified as autopolyploid [4][5][6], and are attracting considerable attention for forest tree breeding.…”