两种表面活性剂对污染土壤中重金属的萃取研究

选取2种非离子型表面活性剂Tween80和TritonX-100,设定0.5%、1.0%、3.0%、5.0%不同浓度和4.0、6.8、8.0、10.0不同pH值,对受重金属污染的土壤进行萃取试验。结果表明:Tween80溶液的浓度越高,pH值越低,对重金属的萃取效果越好,对重金属的萃取能力大小顺序为Cu>Cd>Zn>Pb;TritonX-100溶液的浓度越低,pH值越低,对重金属去除效果越好,对重金属的萃取能力大小顺序为Cu>Pb>Zn>Cd。2种表面活性剂相比较,Tween80对Cu和Cd的萃取效果比TritonX-100的萃取效果好;TritonX-100对Pb的萃取效果比Tween80的萃取效果好。Tween80和TritonX-1002种表面活性剂对重金属的萃取效率都偏低,用于重金属污染土壤修复不大可行。

Extraction of Heavy Metals in Contaminated Soils with Two Surfactants

In order to investigate extracting efficiency of two non-ionic surfactants(Tween80 and TritonX-100) to heavy metals in contaminated soils,a batch experiment was conducted.The results indicated that Tween80 solution with higher concentration and lower pH had better extracting efficiency.The extracting efficiency of Tween80 to the heavy metals was discovered to be in an order: Cu>Cd>Zn>Pb.The lower of the concentration and pH for TritonX-100,the better extracting efficiency to heavy metals was.If identical concentration and pH value for the extratants,the extracting efficiency of Tween80 to Cu and Cd were superior than TritonX-100,but the extracting efficiency to Pb and Zn was less than TritonX-100.Because of this,the two surfactants mentioned were lower extracting ability,they were not ideal extractants to removal heavy metals in the polluted soils.