The Transfer Mechanism of Pb and Cd in Different Amendments in the Process of In-situ Chemical Remediation

Two kinds of amendments on heavy metal in soil:ammonium salt amendment and organic acid amendment were investigated.Their mass transfer relationship in the process of in-situ chemical remediation of soil polluted by Pb and Cd were studied,respectively.In order to characterize their migration mechanism,we soaked the Pb and Cd contaminated soil column with water,and we studied the change of concentration of WS-Pb and WS-Cd and pH value of the extract liquid.The results indicate that both of concentrate amendment and organic amendment can be used as economic heavy metal amendments,and the concentrate amendment has a better and more stable performance than organic amendment.