LIN, Zhongbing; SCHNEIDER, Andre; NGUYEN, Christophe; STERCKEMAN, Thibault

doi:10.1007/s11356-014-3218-8

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LIN, Zhongbing
Laboratoire Sols et Environnement [LSE]

SCHNEIDER, Andre
Interactions Sol Plante Atmosphère [UMR ISPA]

NGUYEN, Christophe
Interactions Sol Plante Atmosphère [UMR ISPA]

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Environmental Science and Pollution Research. 2014, vol. 21, n° 22, p. 12811-12826

Springer Verlag

Résumé en anglais

Phytoextraction is a potential method for cleaning Cd-polluted soils. Ligand addition to soil is expected to enhance Cd phytoextraction. However, experimental results show that this addition has contradictory effects on plant Cd uptake. A mechanistic model simulating the reaction kinetics (adsorption on solid phase, complexation in solution), transport (convection, diffusion) and root absorption (symplastic, apoplastic) of Cd and its complexes in soil was developed. This was used to calculate plant Cd uptake with and without ligand addition in a great number of combinations of soil, ligand and plant characteristics, varying the parameters within defined domains. Ligand addition generally strongly reduced hydrated Cd (Cd2+) concentration in soil solution through Cd complexation. Dissociation of Cd complex ( CdL ) could not compensate for this reduction, which greatly lowered Cd2+ symplastic uptake by roots. The apoplastic uptake of CdL was not sufficient to compensate for the decrease in symplastic uptake. This explained why in the majority of the cases, ligand addition resulted in the reduction of the simulated Cd phytoextraction. A few results showed an enhanced phytoextraction in very particular conditions (strong plant transpiration with high apoplastic Cd uptake capacity), but this enhancement was very limited, making chelant-enhanced phytoextraction poorly efficient for Cd.< Réduire

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phytoextraction

complexation

Mots clés en anglais

ligand addition

mechanistic model

plant root uptake

cadmium

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Can ligand addition to soil enhance Cd phytoextraction? A mechanistic model study

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