Effect of Different Stabilizers on Cadmium and Lead Uptake by Maize

doi:10.11924/j.issn.1000-6850.casb14120201

Abstract

Abstract: In order to provide scientific basis for the utilization of calcareous soil polluted by cadmium and lead, the author studied the influence of two stabilizers on the uptake of cadmium and lead by maize and their remediation effects on moderately-polluted soil. Bentonite and KH2PO4 were selected as stabilizers and field experiment was conducted in moderately- polluted soil. The results showed that bentonite combined with KH2PO4 could reduce the concentration of lead in grains, stem leaf and roots by 37.22%, 40.18% and 34.06%, respectively. For cadmium concentration, those values were 24.53%, 5.85% and 14.82%, respectively. Both stabilizer-treatments could increase plant height, yield and dry biomass of aboveground part and decrease bioconcentration factor of lead and transport factor of cadmium. In addition, transport factor of lead also decreased in the treatment of bentonite combined with KH2PO4. Thus, bentonite combined with KH2PO4 could be used as an ideal repair material in calcareous-soil contaminated by heavy metals.

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