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Potential immobilization of Cu(II) and Zn(II) in soil by using sodium sulfide (Na 2 S) and sodium diethyl dithiocarbamate (DDTCNa) were investigated in terms of immobilizing agent dosage and leaching pH by column leaching tests. The formation of metal sulfide products and the immobilization mechanism were systematically studied by XRD measurements and chemical equilibrium analysis. Leaching...