A model of the uptake, translocation, and accumulation of lead (Pb) by maize for the purpose of phytoextraction

Phytoextraction is a remediation technology that uses plants to remove heavy metals from soil. Effective implementation requires an understanding of plant processes that control uptake and translocation of metals from the soil. These processes are poorly understood. The purpose of this work is to ga...

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Bibliographic Details
Published in:Ecological engineering 1999-02, Vol.12 (3), p.271-297
Main Authors: Brennan, Mark A., Shelley, Michael L.
Format: Article
Language:English
Subjects:
Lead (Pb)
Maize
Phytoextraction
Phytoremediation
Precipitation
Translocation
Uptake
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Summary:Phytoextraction is a remediation technology that uses plants to remove heavy metals from soil. Effective implementation requires an understanding of plant processes that control uptake and translocation of metals from the soil. These processes are poorly understood. The purpose of this work is to gain insights on the plant mechanisms that control uptake and translocation of lead (Pb) from the soil and how these mechanisms interact to control levels of Pb accumulation in the plant. A mechanistic system dynamics modeling approach was used, simulating extraction and translocation of Pb by a maize plant. Confidence in the model structure was achieved through application of classical system dynamics validation procedures. Results of model simulations suggest that precipitation of Pb as a Pb-phosphate is one of the most important mechanisms in this system. Maximum saturable uptake rate of Pb and effective root mass may also be key plant parameters. The model may also be used to test phytoextraction management scenarios, two of which were tested in this study.
ISSN:0925-8574
1872-6992
DOI:10.1016/S0925-8574(98)00073-1