Limits...
Phytoscreening and phytoextraction of heavy metals at Danish polluted sites using willow and poplar trees.

Algreen M, Trapp S, Rein A - Environ Sci Pollut Res Int (2013)

Bottom Line: Concentrations in wood from the highly polluted site were significantly elevated, compared to references, in particular for willow.The conclusion from these results is that tree coring could be used successfully to identify strongly heavy metal-polluted soil for Cd, Cu, Ni, Zn, and that willow trees were superior to poplars, except when screening for Ni.Extraction efficiencies were best for willows and Cd, but below 0.5% over 10 years, and below 1‰ in 10 years for all other HMs.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Engineering, Technical University of Denmark, Miljøvej building 113, DK-2800, Kongens Lyngby, Denmark, mann@env.dtu.dk.

ABSTRACT
The main purpose of this study was to determine typical concentrations of heavy metals (HM) in wood from willows and poplars, in order to test the feasibility of phytoscreening and phytoextraction of HM. Samples were taken from one strongly, one moderately, and one slightly polluted site and from three reference sites. Wood from both tree species had similar background concentrations at 0.5 mg kg(-1) for cadmium (Cd), 1.6 mg kg(-1) for copper (Cu), 0.3 mg kg(-1) for nickel (Ni), and 25 mg kg(-1) for zinc (Zn). Concentrations of chromium (Cr) and lead (Pb) were below or close to detection limit. Concentrations in wood from the highly polluted site were significantly elevated, compared to references, in particular for willow. The conclusion from these results is that tree coring could be used successfully to identify strongly heavy metal-polluted soil for Cd, Cu, Ni, Zn, and that willow trees were superior to poplars, except when screening for Ni. Phytoextraction of HMs was quantified from measured concentration in wood at the most polluted site. Extraction efficiencies were best for willows and Cd, but below 0.5% over 10 years, and below 1‰ in 10 years for all other HMs.

Show MeSH
HM concentrations measured in the wood of poplars and willows from strongly polluted test site 1, slightly polluted test site 2, and non-polluted test site 3 and reference sites (Ref. 1 to 3). Average concentrations, error bars indicate range
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Fig1: HM concentrations measured in the wood of poplars and willows from strongly polluted test site 1, slightly polluted test site 2, and non-polluted test site 3 and reference sites (Ref. 1 to 3). Average concentrations, error bars indicate range

Mentions: Concentrations measured in the tree core samples are summarized in Table 1 (for more details see Table S3, Supporting Information). The average and range of metal concentrations in willows and poplars can also be seen in Fig. 1. The concentrations of Cd, Cu, Ni, and Zn in wood were in all, except a few cases, above DL. For Cr and Pb, almost all concentrations in wood were below DL and are not shown and not evaluated further. Willows showed generally higher concentrations of Cd, Cu, and Zn than poplars. Only for Ni, poplars had the higher concentration in wood.Fig. 1


Phytoscreening and phytoextraction of heavy metals at Danish polluted sites using willow and poplar trees.

Algreen M, Trapp S, Rein A - Environ Sci Pollut Res Int (2013)

HM concentrations measured in the wood of poplars and willows from strongly polluted test site 1, slightly polluted test site 2, and non-polluted test site 3 and reference sites (Ref. 1 to 3). Average concentrations, error bars indicate range
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4125817&req=5

Fig1: HM concentrations measured in the wood of poplars and willows from strongly polluted test site 1, slightly polluted test site 2, and non-polluted test site 3 and reference sites (Ref. 1 to 3). Average concentrations, error bars indicate range
Mentions: Concentrations measured in the tree core samples are summarized in Table 1 (for more details see Table S3, Supporting Information). The average and range of metal concentrations in willows and poplars can also be seen in Fig. 1. The concentrations of Cd, Cu, Ni, and Zn in wood were in all, except a few cases, above DL. For Cr and Pb, almost all concentrations in wood were below DL and are not shown and not evaluated further. Willows showed generally higher concentrations of Cd, Cu, and Zn than poplars. Only for Ni, poplars had the higher concentration in wood.Fig. 1

Bottom Line: Concentrations in wood from the highly polluted site were significantly elevated, compared to references, in particular for willow.The conclusion from these results is that tree coring could be used successfully to identify strongly heavy metal-polluted soil for Cd, Cu, Ni, Zn, and that willow trees were superior to poplars, except when screening for Ni.Extraction efficiencies were best for willows and Cd, but below 0.5% over 10 years, and below 1‰ in 10 years for all other HMs.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Engineering, Technical University of Denmark, Miljøvej building 113, DK-2800, Kongens Lyngby, Denmark, mann@env.dtu.dk.

ABSTRACT
The main purpose of this study was to determine typical concentrations of heavy metals (HM) in wood from willows and poplars, in order to test the feasibility of phytoscreening and phytoextraction of HM. Samples were taken from one strongly, one moderately, and one slightly polluted site and from three reference sites. Wood from both tree species had similar background concentrations at 0.5 mg kg(-1) for cadmium (Cd), 1.6 mg kg(-1) for copper (Cu), 0.3 mg kg(-1) for nickel (Ni), and 25 mg kg(-1) for zinc (Zn). Concentrations of chromium (Cr) and lead (Pb) were below or close to detection limit. Concentrations in wood from the highly polluted site were significantly elevated, compared to references, in particular for willow. The conclusion from these results is that tree coring could be used successfully to identify strongly heavy metal-polluted soil for Cd, Cu, Ni, Zn, and that willow trees were superior to poplars, except when screening for Ni. Phytoextraction of HMs was quantified from measured concentration in wood at the most polluted site. Extraction efficiencies were best for willows and Cd, but below 0.5% over 10 years, and below 1‰ in 10 years for all other HMs.

Show MeSH