锑污染土壤固化-稳定化的影响因素

通过比较不同稳定剂、固化剂、土壤pH条件下土壤中重金属锑的修复效果,研究了锑的固化-稳定化影响因素并探讨了相关稳定化机理。实验结果表明：铁基稳定剂的效果明显优于磷酸二氢钾和腐殖酸钠,而零价铁的稳定化效果更优于硫酸铁和硫酸亚铁,较适宜的稳定剂投加量为5%（w）;水泥做固化剂对锑的稳定化效果优于氧化钙,最佳投加量为5%（w）;土壤pH为7左右时,锑的稳定化效果较好;稳定剂的投加使得部分不稳定状态（可交换态）锑转化为稳定状态（残渣态和铁锰氧化物结合态）,从而降低了锑的浸出质量浓度。

Factors affecting solidification/stabilization of antimony contaminated soil

By comparing the remediation effects of different stabilizing agents,curing agents and pH conditions,the factors affecting the solidification/stabilization of antimony contaminated soil were studied and the related mechanism was discussed. The results showed that：The effect of iron-based stabilizing agent was better than that of potassium dihydrogen phosphate and sodium humate,and that of zero-valent iron was obviously better than ferric sulfate and ferrous sulfate;The suitable dosage of stabilizing agent was 5%（w）;The effect of cement as curing agent on antimony stabilization was better than that of calcium oxide while the optimum dosage was 5%（w）;The stabilization effect of antimony was better when the soil pH was close to 7;The addition of stabilizing agent makes part of the unstable form（exchangeable form）of antimony into stable form（residual form and iron-manganese oxide bound form）,thereby reducing the leaching mass concentration of antimony.