1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China; 2. State Key Laboratory of Hydraulics and Development and Protection of Revers in Mountain Area, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China
Abstract: In a cadmium lightly polluted farmland chosen, corn is planted in dryland and rice is planted in paddy field.The content of heavy metals, fertility and other physical and chemical properties in the soil are tested and analyzed.The soil polluted by cadmium is remediated though the compensation mechanism by using quicklime, magnesium oxide and calcium-based bentonite as formula passivation agents.Influences of passivation agents on soil pH, cadmium activity and cadmium bioconcentration factor of agricultural products are compared and analyzed.Results show that pH values of cadmium contaminated dryland soil and paddy field soil increase by 1.59 units and 0.79 units, respectively after formula remediation.Cadmium activity in dryland soil decreases from 42.2% to 21.8%, and that in paddy field soil decreases from 41.47% to 28.79%.It is also found that after passivation agents have been applied in the soil, cadmium bioconcentration factor of the corn from the dryland reduces from 13.75% to 2.64% and that of the rice from the paddy field declines from 24.38% to 6.6%.
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