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Effects of Two Inorganic Eluents on Removal of Pb and Cd From Mining-Contaminated Soils
Author(s): 
Pages: 241-245
Year: Issue:  3
Journal: Rural Eco-Environment

Keyword:  无机洗脱剂 污染土壤 重金属 Pb Cd 洗脱;
Abstract: 选用HCl和CaCl22种无机洗脱剂对矿区重金属污染土壤进行化学洗脱试验,分析比较了2种洗脱剂对土壤中Pb、Cd的洗脱效果,并探讨了洗脱剂浓度、洗脱时间、温度、固液比、洗脱次数对土壤中Pb、Cd洗脱效果的影响。结果表明,对于土壤中Pb的洗脱,HCl的效果优于CaCl2,其洗脱率分别为26.0%~68.2%和14.6%~48.7%;而对于土壤中Cd的洗脱,CaCl2优于HCl,其洗脱率分别为30.7%~54.6%和24.2%~42.6%。在各影响因素中,洗脱剂浓度对土壤中Pb的洗脱有显著影响,而洗脱次数对土壤中Cd的洗脱有显著影响,其他因素对Pb、Cd的洗脱均无显著影响。洗脱土壤中Pb的最佳操作条件为:HCl 200 mmol.L-1、时间240 min、温度20℃、m(固)∶V(液)=1∶15、洗脱2次;洗脱土壤中Cd的最佳操作条件为:CaCl250 mmol.L-1、时间240 min、温度35℃、m(固)∶V(液)=1∶20、洗脱4次。
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