Large areas worldwide are polluted by cadmium (Cd) and lead (Pb). The objective of this study was to develop and verify a simple model for phytoextraction of Cd and Pb. Consequently, a new model was developed based on soil and plant responses to Cd and Pb pollutants. Polluted soils were packed into some pots. Land cress and spinach seeds were germinated in the pots. Results showed the more Pb and Cd-tolerance of land cress compared to spinach. Land cress dry matter was about 50 times more than that of spinach at same contaminations. For spinach, there was a threshold soil Pb concentration (600 mg kg⁻¹), beyond which plant is more efficient to uptake Pb. Results also indicated that the proposed model with linear sorption isotherm can reasonably well predict the time needed for remediation of soil Pb. However, the model could not provide a reasonable prediction for Cd remediation.
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