摘要
选用连二亚硫酸钠作为修复药剂,通过正交试验,探讨了药剂量、水土比、养护时间及搅拌时间等4个因素对该药剂修复铬污染土壤效果的影响,并基于肠胃模拟方法,考察了修复前后土壤中铬的生物有效性变化,并评估其健康风险。结果表明,就铬污染土壤而言,药剂量对修复后土壤的六价铬浸出浓度影响最大,其他因素次之。达到较好修复效果的最佳修复条件为药剂量为8%、水土比为0.5、养护时间为1天、搅拌时间为15 min。药剂修复后土壤的六价铬生物有效性大幅降低,降幅为63.21%~84.67%,六价铬致癌风险降幅达81.7%,有效降低人体健康风险。
The optimal conditions of remediation of sodium hyposulfite and the bioavailability changes of Cr in soil before and after remediation were studied. The results showed that for the chromium-contaminated soil, agent dosage was the factor that had the most effect on total and hexavalent Cr leaching concentration. The optimal conditions for the agent on the remediation of Cr-contaminated soil were 8% dosage, 0.5 ： 1 water soil ratio （v/w）, 1 d curing time and 15 min stirring time. After remediation, bioavailability of the hexavalent Cr was significantly decreased by 63.21% - 84.67%, the carcinogenic risk of hexavalent Cr decreased 81.7%, and so the human health risk could be reduced effectively.
出处
《土壤》
CAS
CSCD
北大核心
2016年第3期523-528,共6页
Soils
基金
北京市自然科学基金项目(8164055)
环保公益项目(201009016
201009009-003)
北京市环境保护科学研究院科技基金项目(2013B08)资助
关键词
药剂
铬
污染土壤
生物有效性
Agent
Cr
Contaminated soil
Bioavailability
