Table 3 displays the maximal desorption of Pb, Cu and PCB in the EDDS/saponin and EDTA/TX-100 system respectively. Results showed that the desorption of Pb andCu in theEDDS/saponin systemweremuch higher than those in the EDTA/TX-100 system, while the desorption of PCB in the EDDS/saponin systemwas slightly less than that in the EDTA/TX-100 system.