Abstract
Organic phosphonic acid has good chelation ability, easy biodegradation, and belongs to environmental friendly reagent. It can be used as eluent to remediate soil contaminated by heavy metal Cd. This paper studied the migration and transformation process of Cd in organic phosphonic acid BHMTPMPA remediation soil. The results showed that the concentration of exchangeable Cd in 1-7 layer of soil column was significantly higher than that in control, and the concentration of exchangeable Cd in 8-10 layer was not significantly different. The activation effect of BHMTPMPA on Cd in soil column is mainly concentrated in the depth of 0-70 cm soil layer. The exchangeable states in layer 2 Cd the highest concentration, and the exchangeable states in other soil layers Cd no obvious migration occurs, which indicated that the migration mainly occurred in the depth of 0-20 cm soil layer, and the Cd of other forms in the soil column did not occur obvious migration phenomenon.
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