The health risk assessment and remediation guide limit value of typical chromium slag contaminated sites
典型铬渣污染场地健康风险评价及修复指导限值

The chromium slag contaminated sites of a chemical plant in Qinghai was analyzed by drilling for the characteristics and chromium content, and received the hydrogeology and chromium pollution of contaminated sites. The potential health risk on the surrounding residents was assessed by EPA's Health Risk Calculation Model, which was based on the current situation of life. The guide limits value of the contaminated site remediation was discussed by using the groundwater and soil solute transportation equations and the desorption curve of Cr6+ according to the remedial goal. The results showed: 0~4m of the surface soil is the loess-like sand, 4~22m is the gravel, and the size of chromium pollution area was about 4×104m2. The heath risk value of Cr6+ for human body is 9.39, so it should be controlled and remedied, while that of Cr3+ is within the acceptable risk value range. The results obtained by calculation were that the restoration value of Cr6+ was 60 mg kg-1 for the 0~4m loess soil and 15 mg kg-1 for 4~22m gravelly sand.