Plant-induced changes in the bioavailability of heavy metals in soil and biosolids assessed by DGT measurements

Huynh, Trang. T., Zhang, Hao, Laidlaw, W. Scott, Singh, Balwant and Baker, Alan J. M. (2010) Plant-induced changes in the bioavailability of heavy metals in soil and biosolids assessed by DGT measurements. Journal of Soil and Sediments, 10 6: 1131-1141. doi:10.1007/s11368-010-0228-0


Author Huynh, Trang. T.
Zhang, Hao
Laidlaw, W. Scott
Singh, Balwant
Baker, Alan J. M.
Title Plant-induced changes in the bioavailability of heavy metals in soil and biosolids assessed by DGT measurements
Journal name Journal of Soil and Sediments   Check publisher's open access policy
ISSN 1439-0108
1614-7480
Publication date 2010-09
Sub-type Article (original research)
DOI 10.1007/s11368-010-0228-0
Volume 10
Issue 6
Start page 1131
End page 1141
Total pages 11
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2011
Language eng
Formatted abstract
Purpose This study investigated the effects of plants on the
available pools of heavy metals and their re-supply potential
in contaminated substrates in a short-term experiment using
five metal-accumulating willow and poplar species/cultivars
and in a longer-term experiment for Salix x reichardtii.
Material and methods Five species of willow and poplar
were grown in either soil or biosolids for short-term
experiment (4 months). Further investigations of longer-term
effects of plant on metal availability were conducted with S. x
reichardtii
grown in biosolids in a column (100 cm height
and 37.5 cm diameter) experiment over a period of 12 months.
Samples collected before and after experiments were determined
for pH and bioavailability of metals using diffusive
gradients in thin films (DGT). Various pools of metals in
biosolids were determined by sequential extraction. Concentrations
of heavy metals in plant material were determined.
Results and discussion The concentration of metals determined
by DGT (CDGT) and concentration of metals in pore
water (CSOL) of Ni, Cu, Zn, and Cd in soil and biosolids
generally decreased significantly compared to the initial
measurements and were usually lower than those of the
controls. However, CDGT and CSOL were higher in planted
soil compared to those in the controls. There was a negative
correlation between Ni, Zn, and Cd in plant shoots and CDGT
in both soil and biosolids. The R values, the ratio of CDGT/
CSOL calculated for Ni, Cd and Zn of planted substrates,
were significantly higher than the corresponding R values of
initial substrates. By contrast, R values for Cu showed little
change. R values for Ni, Zn, and Cd were higher in planted
biosolids compared to the unplanted biosolids. While S. x
reichardtii
leaf Cd, Ni, and Zn concentrations increased
significantly over time, leaf Cu concentration declined. The
patterns of plant uptake for the metals reflected the patterns
observed by DGT and soil solution measurements of R.
Sequential extraction of heavy metals from biosolids after
12 month’s experimentation confirmed that Cu was predominantly
in the organic fraction.
Conclusions The short-term effects of plants on the bioavailability
of metals in soils and biosolids were different.
The R values of cultivated treatments varied between
species but were not significantly different from the
control in most of the cases. The longer-term experiment
indicated that both CDGT and CSOL of Ni, Zn, and Cd
decreased significantly over time in both planted and
unplanted treatments. The results of this study demonstrated
that R values measured by DGT may be useful in assessing
the potential bioavailability of heavy metals in soil and
biosolids. © 2010 Springer-Verlag.
Keyword Availability
Biosolids
DGT
Heavy metals
Phytoextraction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2011 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 29 Aug 2010, 00:02:32 EST