Modelling metal accumulation using humic acid as a surrogate for plant roots

Le, T. T. Yen, Swartjes, Frank, Romkens, Paul, Groenenberg, Jan E., Wang, Peng, Lofts, Stephen and Hendriks, A. Jan (2015) Modelling metal accumulation using humic acid as a surrogate for plant roots. Chemosphere, 124 1: 61-69. doi:10.1016/j.chemosphere.2014.11.003


Author Le, T. T. Yen
Swartjes, Frank
Romkens, Paul
Groenenberg, Jan E.
Wang, Peng
Lofts, Stephen
Hendriks, A. Jan
Title Modelling metal accumulation using humic acid as a surrogate for plant roots
Journal name Chemosphere   Check publisher's open access policy
ISSN 1879-1298
0045-6535
Publication date 2015-04
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.chemosphere.2014.11.003
Open Access Status
Volume 124
Issue 1
Start page 61
End page 69
Total pages 9
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Collection year 2015
Language eng
Formatted abstract
Metal accumulation in roots was modelled with WHAM VII using humic acid (HA) as a surrogate for root surface. Metal accumulation was simulated as a function of computed metal binding to HA, with a correction term (EHA) to account for the differences in binding site density between HA and root surface. The approach was able to model metal accumulation in roots to within one order of magnitude for 95% of the data points. Total concentrations of Mn in roots of Vigna unguiculata, total concentrations of Ni, Zn, Cu and Cd in roots of Pisum sativum, as well as internalized concentrations of Cd, Ni, Pb and Zn in roots of Lolium perenne, were significantly correlated to the computed metal binding to HA. The method was less successful at modelling metal accumulation at low concentrations and in soil experiments. Measured concentrations of Cu internalized in L. perenne roots were not related to Cu binding to HA modelled and deviated from the predictions by over one order of magnitude. The results indicate that metal uptake by roots may under certain conditions be influenced by conditional physiological processes that cannot simulated by geochemical equilibrium. Processes occurring in chronic exposure of plants grown in soil to metals at low concentrations complicate the relationship between computed metal binding to HA and measured metal accumulation in roots.
Keyword Root uptake
Metal
Modelling
WHAM
Affinity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 4 Dec 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2015 Collection
 
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