复合污染场地污染特征分析及健康风险评估

Pollution Characteristics and Health Risk of Heavy Metals and Polycyclic Aromatic Hydrocarbons in a Co-contaminated Site

以某重金属和多环芳烃(PAHs)复合污染场地为例,开展了环境调查、污染特征分析及健康风险评估.结果表明:土壤中Sb(锑)和PAHs的污染严重且主要集中在表层和浅层;土壤中Sb的污染导致相应区域浅层地下水中Sb的污染程度较高;污染物的分布具有明显的空间差异性且来源不同的污染物经过迁移或先后进入环境而在场地部分区域共存形成复合污染;经健康风险评估,土壤中Sb、苯并[a]蒽(BaA)、苯并[b]荧蒽(BbFA)、苯并[a]芘(BaP)、茚并[1,2,3-cd]芘(IPY)、二苯并[a,h]蒽(DBA)和苯并[k]荧蒽(BkF)的风险控制值分别为6.67、0.73、0.73、0.4、0.73、0.1和7.22mg·kg^(-1),待修复方量为1.54万m^3;地下水中Sb的风险控制值为0.185mg·L^(-1),待修复总量为136.3m3.

The environmental investigation, pollution characteristics analysis and health risk assessment were performed for a heavy metals and polycyclic aromatic hydrocarbons（PAHS） co-contaminated site. The results showed that there are high concentrations of Sb and PAHs in surface（0.3 m）and subsurface（1.1 m）soils.Due to the concentration of Sb in soil,there is also high concentration of Sb in Shallow groundwater.The distribution of contaminants has obvious spatial difference and through migrating in environmental or entering successively,contaminants from different sources coexist in parts of the co-contaminate site.The health risk assessment indicates that the risk control values of Sb,BaA,BbFA,BaP,IPY,DBA and BkF for soil are as follows：6.67,0.73,0.73,0.4,0.73,0.1 and 7.22 mg·kg^（-1）,and that of Sb for groundwater is 0.185 mg·L^（-1）.The repaired soil and groundwater volume are 1.54×104 m^3 and 136.3 m^3,respectively.