CAJ | 학술논문

以某焦化污染场地为例,采用 PRA(概率风险评价)方法研究了17个人体暴露参数和5个土壤理化性质参数的不确定性对土壤中8种污染物修复目标值的影响.结果表明：PRA与DRA修复目标值的比值仅深层Nap为0.9,其余为1.11~2.49,因此,采用传统的DRA(确定性风险评价)方法制定的修复目标值容易偏保守；将土壤中污染物含量降低到 PRA 修复目标值所产生的暴露风险均在可接受的范围内,但表层土壤 Ben 对人体健康产生危害的可能性最大；参数敏感性分析的结果表明成人暴露周期(EDa,贡献率为35%~59.8%)和儿童暴露周期(EDc,6.2%~20.2%)对各污染物修复目标值不确定性的影响均较大,此外,土壤理化性质参数,如土壤有机碳含量(foc)、土壤孔隙中空气体积比(θair,vad)和土壤孔隙中水体积比(θwater,vad)对易挥发的Ben和Nap影响较大,儿童每日土壤摄入量(IRs-c)对不易挥发的BaA~DBA影响较大.
이모초화오염장지위례,채용 PRA(개솔풍험평개)방법연구료17개인체폭로삼수화5개토양이화성질삼수적불학정성대토양중8충오염물수복목표치적영향.결과표명：PRA여DRA수복목표치적비치부심층Nap위0.9,기여위1.11~2.49,인차,채용전통적DRA(학정성풍험평개)방법제정적수복목표치용역편보수；장토양중오염물함량강저도 PRA 수복목표치소산생적폭로풍험균재가접수적범위내,단표층토양 Ben 대인체건강산생위해적가능성최대；삼수민감성분석적결과표명성인폭로주기(EDa,공헌솔위35%~59.8%)화인동폭로주기(EDc,6.2%~20.2%)대각오염물수복목표치불학정성적영향균교대,차외,토양이화성질삼수,여토양유궤탄함량(foc)、토양공극중공기체적비(θair,vad)화토양공극중수체적비(θwater,vad)대역휘발적Ben화Nap영향교대,인동매일토양섭입량(IRs-c)대불역휘발적BaA~DBA영향교대.
A Probabilistic risk assessment (PRA) was used to characterize variability and uncertainty of 17 parameters related to human exposure and 5 related to soil physicochemical properties in deriving the soil cleanup levels of 8 pollutants in a coking plant. Results showed that the ratios of PRA clean-up level to DRA clean-up level were 1.11~2.49, except for Nap in subsoil (0.9), therefore, the cleanup levels derived by using deterministic risk assessment (DRA) method were in general more conservative than these by using PRA in this case. If contaminants in soil were reduced to the PRA clean-up levels, all the exposure risks would be acceptable but at different levels, and Ben in topsoil was more likely to cause harm to human health than others. The sensitivity analysis revealed that adult exposure duration (EDa) and child exposure duration (EDc) both contributed most to the uncertainty (sensitive ratio:35%~59.8%for EDa and 6.2%~20.2%for EDc) in the derivation of all the clean-up levels. Soil physic-chemical parameters, such as soil organic carbon content (foc), volumetric air content in soil (θair,vad) and volumetric water content in soil (θwater,vad), were more sensitive to volatile Ben and Nap and less to semi-volatile BaA~DBA. Contrastingly child soil ingestion rate (Irs-c) were more sensitive to BaA~DBA and less to Ben and Nap.