崔勇,陈果,宁禹航,李亚斌,王安钰,王坚.污染地块土壤多氯联苯风险筛选值研究[J].环境科学学报,2021,41(11):4676-4685
污染地块土壤多氯联苯风险筛选值研究
- Study on the soil screening levels for polychlorinated biphenyls of contaminated sites
- 基金项目：国家重点研发计划（No.2019YFC1805600）；辽宁省重点研发计划（No.2020020218-JH2/103）
- 崔勇
- 1. 沈阳环境科学研究院, 沈阳 110167;2. 国家环境保护危险废物处置工程技术(沈阳)中心, 沈阳 110167;3. 辽宁省危险废物处置专业技术创新中心, 沈阳 110167
- 陈果
- 1. 沈阳环境科学研究院, 沈阳 110167;2. 国家环境保护危险废物处置工程技术(沈阳)中心, 沈阳 110167;3. 辽宁省危险废物处置专业技术创新中心, 沈阳 110167
- 宁禹航
- 1. 沈阳环境科学研究院, 沈阳 110167;2. 沈阳环科检测技术有限公司, 沈阳 110015
- 李亚斌
- 1. 沈阳环境科学研究院, 沈阳 110167;2. 沈阳环科检测技术有限公司, 沈阳 110015
- 王安钰
- 1. 沈阳环境科学研究院, 沈阳 110167;2. 国家环境保护危险废物处置工程技术(沈阳)中心, 沈阳 110167
- 王坚
- 1. 沈阳环境科学研究院, 沈阳 110167;2. 国家环境保护危险废物处置工程技术(沈阳)中心, 沈阳 110167;3. 辽宁省危险废物处置专业技术创新中心, 沈阳 110167
- 摘要：污染地块土壤多氯联苯（PCBs）污染主要来自含PCBs电力设备封存点的泄漏及非故意产生源，建立土壤PCBs筛选标准是开展PCBs污染地块调查、评估和修复的基础.本研究通过文献分析统计了典型PCBs单体的占比，并基于人体健康风险评估模型推导了污染地块土壤PCBs风险筛选值.结果表明，不同商用PCBs混合物中共平面PCBs总量（∑Co-PCBs）占比为0.01%~16.10%，难以代表PCBs的总体风险水平.研究建立了PCBs总量、指示性PCBs总量（∑Id-PCBs）及∑Co-PCBs等3个指标共同作为土壤PCBs筛选值体系，敏感用地和非敏感用地情景下，PCBs总量、∑Id-PCBs、∑Co-PCBs分别为2.10、0.24、0.03 mg·kg-1和6.20、0.71、0.09 mg·kg-1.通过6个含PCBs电容器地下封存点485个污染土壤样品的分析，进一步证明了仅控制∑Co-PCBs将低估PCBs污染风险，采用本研究提出的3个指标进行筛选能够更有效地识别和评估PCBs污染地块的风险.
- Abstract：Soil contamination by polychlorinated biphenyls (PCBs) is mainly caused by the leakage of PCB-containing electrical-equipment storage facilities and the emission of unintentional production sources. Establishing the soil PCBs screening level is the basis for the investigation, evaluation and remediation of PCB-contaminated sites. This study performed a literature analysis of the proportions of typical PCBs congeners and derived the PCBs soil screening levels based on the human health-risk assessment model. The results showed that the total coplanar PCBs (∑Co-PCBs) in different commercial PCB mixtures accounted for only 0.01%~16.10%, which is unlikely to represent the overall risk level of PCBs. We then established three risk indicators:total PCBs, total indicative PCBs (∑Id-PCBs) and ∑Co-PCBs and proposed their soil screening levels as 2.10, 0.24 and 0.03 mg·kg-1 in sensitive land-use scenarios and 6.20, 0.71 and 0.09 mg·kg-1 in non-sensitive land-use scenarios, respectively. After analysing 485 contaminated soil samples from six underground storage sites of capacitors containing PCBs, we confirmed that controlling the ∑Co-PCBs alone would underestimate the risk of PCB contamination and screening with the three indicators can more effectively identify and assess the risk of PCBs-contaminated sites.
