摘要
为探究土壤热修复后的土壤重金属形态以及健康风险的变化,以退役电镀企业地块的污染土壤为研究目标,分别在200、400和600℃下处理土壤15 min,以分析热处理对土壤重金属Cu、Pb、Ni和Cd赋存形态的影响、生物可给性变化以及重金属人体健康风险的差异。结果表明,经热处理后,土壤Cu、Pb和Ni的酸可提取态增加,增加了胃肠阶段的生物可给性,而Cd酸可提取态减少,生物可给性降低。在基于生物可给性的风险评估中,热处理会增加Cu、Pb和Ni的健康风险,在600℃处理下,Pb对儿童的危害商从0.41增加至3.70,Cd的健康风险无显著性差异。本研究结果可为场地土壤热处理后的重金属健康风险及生态效应评估提供参考。
In order to study the variation of chemical speciation of soil heavy metals and health risks after thermal treatment,the temperature was set at 200,400 and 600℃respectively for 15 minutes to analyze chemical speciation of Cu,Pb,Ni and Cd,the variation of its bioavailability and the differences in human health risks in the contaminated soils of the decommissioning electroplating site.The results showed the acid soluble fraction of Cu,Pb and Ni and its bioavailability in the gastrointestinal stage were increased after thermal treatment,while the acid soluble fraction of Cd and its bioavailability were decreased.In the risk assessment based on bioavailability,thermal treatment increased the health risk of Cu,Pb and Ni.the hazard quotient of Pb for children increased from 0.41 to 3.70 at 600℃,but there was no significant difference in hazard quotient of Cd.This work could provide a reference for the evaluation of the health risk and ecological effects of heavy metals in contaminated sites after thermal treatment.
作者
韩瑞芳
吕黎
李世远
陈倩倩
方怡
汪洋洋
李晓晓
沈东升
申屠佳丽
HAN Ruifang;LV Li;LI Shiyuan;CHEN Qianqian;FANG Yi;WANG Yangyang;LI Xiaoxiao;SHEN Dongsheng;SHENTU Jiali(School of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310018,China;Environmental Protection Monitoring Station of Shangyu District,Shaoxing 312300,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2021年第11期3623-3631,共9页
Chinese Journal of Environmental Engineering
基金
国家重点研发计划项目(2018YFC1800506)
国家重点研发计划项目(2018YFC1802100)。
关键词
热处理
土壤重金属
赋存形态
健康风险
thermal treatment
soil heavy metals
speciation
health risk
