摘要
通过对青海某化工厂铬渣污染场地钻孔采样,分析了样品质地及铬含量,得到场地的水文地质及铬污染状况.根据场地区域生活现状,运用美国环保局健康风险计算模型,评估了现有条件下该场地对周边居民的潜在健康风险.同时,结合场地的修复目标,应用地下水溶质运移方程及土壤中Cr6+的解吸曲线,探讨了场地污染物的修复指导限值.结果表明:场地表层0～4m为黄土状土,4～22m为砾砂,铬污染区域面积约4×104m2;现有条件下场地Cr6+对人体的健康风险值为9.39,需要对Cr6+进行修复治理,而Cr3+的健康风险值在可接受范围内;通过计算得到场地表层0～4m黄土状土Cr6+的修复值为60mg·kg-1;4～22m砾砂Cr6+修复值为15mg·kg-1.
The chromium slag contaminated sites of a chemical plant in Qinghai were analyzed by drilling samples to investigate the hydrogeology and chromium pollution of the contaminated sites. The potential health risk to the surrounding residents was assessed by the EPA＇s Health Risk Calculation Model,which is based on the current situation of life. The guide limits value of the contaminated site remediation was determined by using the groundwater and soil solute transportation equations and the desorption curve of Cr^6＋ according to the remedial goal. The results showed：0-4 m of the surface soil is loess-like sand,4-22 m is gravel,and the size of the chromium polluted area is about 4×10^4 m^2. The heath risk value of Cr^6＋ for humans is 9.39,so it should be controlled and remediated,while that of Cr3＋ is within the acceptable risk value range. According to our calculations,the restoration value of Cr^6＋ was 60 mg·kg^-1 for the 0-4 m loess soil and 15 mg·kg^-1 for the 4-22 m gravelly sand.
出处
《环境科学学报》
CAS
CSCD
北大核心
2010年第7期1445-1450,共6页
Acta Scientiae Circumstantiae
基金
国家高科技研究发展计划(863)项目(No.2009AA063101)~~
关键词
铬渣
污染场地
风险评价
修复限值
chromium slag
contaminated sites
health-based risk assessment
restoration limit value
