建设用地土壤锰风险控制值探讨——以重庆市某锰污染地块为例  

Risk Control Values of Soil Manganese in Construction Lands:a Case Study of a Manganese-contaminated Site in Chongqing

作　　者：陈波 张浩哲 CHEN Bo;ZHANG Hao-zhe(Chongqing De He Environmental Engineering co.,Ltd,Chongqing 400000,China;School of Geographical Sciences,Southwest University,Chongqing 400715,China)

机构地区：[1]重庆德和环境工程有限公司,重庆401120 [2]西南大学地理科学学院,重庆400715

出　　处：《土壤通报》2020年第6期1482-1488,共7页Chinese Journal of Soil Science

摘　　要：以重庆市某锰污染地块为对象,结合地块用地规划,根据HJ 25.3-2019中规定的评估模型,开展土壤锰污染风险评估,推导风险控制值,并对模型参数开展敏感性分析,同时与土壤背景值、RSL(美国环保局区域办公室"区域筛选值")等进行比较。结果表明:(1)锰的非致癌危害商超过人体可接受水平。锰的非致癌效应涉及经口摄入和吸入土壤颗粒物两种暴露途径;(2)第二类用地方式下锰的风险控制值为536 mg kg^(-1),低于全国和重庆土壤背景值,并且远低于按DB 50/T 725-2016推导的风险控制值和RSL标准值,不适用于污染地块的锰污染风险筛选。对比发现,吸入土壤颗粒物途径下不同暴露概念模型的选择将导致风险控制值差异;(3)参数敏感性排序为:EDa> PM10> BWa/EFa/OSIRa> DAIRa,其中EDa和PM10为敏感参数。研究建议加强锰毒理参数的研究,建立完善的暴露概念模型,优化敏感参数的设置,并开展区域背景值调查,为锰风险控制值的筛选提供参考。The risk assessment of soil manganese(Mn) pollution, risk control value derivation and the sensitivity analysis of the model parameters was carried out according to the land planning and the assessment model in HJ25.3-2019 based on a Mn-contaminated site in Chongqing. Meanwhile, the risk control value of soil Mn was compared with the soil background value and RSL. The non-carcinogenic hazard quotient of Mn exceeded the acceptable level of the human body. Non-carcinogenic effects of Mn had two exposure pathways: oral route and inhalation of soil particulate matter. The risk control value of Mn was 536 mg kg^(-1) under the second type of land use, which was lower than the national and Chongqing local soil background values, but was much lower than the RSL standard value and the risk control value derived from DB 50/T 725-2016. It was not suitable for the risk screening of Mn pollution in the contaminated site. The difference in risk control value was found among different exposure conceptual models under the route of inhaling soil particulate matter. The order of parameter sensitivity was: EDa > PM10> BWa/EFa/OSIRa > DAIRa. EDa and PM10 was a sensitive parameter.

关 键 词：污染地块 风险控制值 锰污染 风险评估 

分 类 号：X825[环境科学与工程—环境工程]