连二亚硫酸钠对铬污染土壤修复条件优化及生物有效性研究  

Optimal Conditions of Sodium Hyposulfite Remediation on Cr-contaminated Soil and Bioavailability Change of Cr in Soil

作　　者：刘增俊[1,2] 刘红敏[3] 夏旭[4] 张旭[2] 李广贺[2] 张丹[1] 姜林[1] 

机构地区：[1]北京市环境保护科学研究院,北京100037 [2]清华大学环境学院,北京100084 [3]河南财政税务高等专科学校,郑州451464 [4]中国农业科学院农业环境与可持续发展研究所,北京100081

出　　处：《土壤》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

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.

关 键 词：药剂 铬 污染土壤 生物有效性 

分 类 号：X53[环境科学与工程—环境工程]