POPs污染场地土壤健康风险评价.doc

第7期收稿日期:2007-07-26;修回2007-11-20 作者简介:张瑜(1983-,女,硕士研究生,从事环境监测与质量评价方面研究,(电子信箱monica8311@ ;*通讯作者,(电话025-********(电子信箱wuyizhong@ 。 POPs 污染场地土壤健康风险评价 张瑜,吴以中*,宗良纲,冯霞 (南京农业大学资源与环境科学学院,江苏 南京210095 摘 要:文章以常州市某化工厂为例,介绍了POPs 污染场地的健康风险评价,分别对两种土地利用类型假设下土壤的3条暴露途 径进行估算,重点考虑了儿童对污染土壤的敏感性,用年龄修正因子计算居民的致癌风险。结果表明两种假设下氯丹和灭蚁灵的致癌风险都超过了可接受的风险水平,在部分高暴露点甚至超过了目标风险值的100倍,需要对场地进行修复。各暴露途径对健康风险的贡献按从大到小排列依次为:直接摄入土壤﹥皮肤接触﹥呼吸摄入。文章还根据健康风险评价的公式反推出适合本污染场地的土壤初级修复目标分别为:氯丹5.2mg/kg 、灭蚁灵7.4×10-1mg/kg (工业用地;氯丹1.6mg/kg 、灭蚁灵2.7×10-1mg/kg (居住用地。 关键词:健康风险评价;污染场地;POPs ;初级修复目标中图分类号:X820.4 文献标志码:A 文章编号:1003-6504(200807-0135-06 Health Risk Assessment :Ca se Study of a Brownfield Contaminat- ed by POPs at Changzhou ZHANG Yu ,WU Yi-zhong *,ZONG Liang-gang ,FENG Xia (School of Resource and Environment Science ,Nanjing Agriculture University ,Nanjing 210095,China Abstracts :Methodologies for health risk assessment (HRA were applied in a brownfield on abandoned industrial site con-taminated by persistent organic pollutants (POPs at Changzhou ,east China.For the defined future land use patterns ,indus-trial (I and residential (II exposure scenarios were assumed and evaluated.HRA focused on 3typical exposure pathways by soil ,which was evaluated with regard to potential risks that may pose to humans ,especially to children.Carcinogenic risks during the first 30years of life were calculated using age-adjusted factors.Results of baseline risk assessment indicated that the potential health risk has exceeded the acceptable cancer risk.Risk from exposure via ingestion contributed most ,which far outweighed the risk via inhalation.Preliminary remedial goals were calculated under the industrial scenario of 5.2and 7.4×10-1mg/kg for chlordane and mirex respectively while 1.6and 2.7×10-1mg/kg under the residential scenario.Key words :health risk assessment (HRA ;brownfield ;persistent organic pollutants (POPs ;preliminary remedial goal 持久性有机污染物(Persistent Organic Pollutants ,POPs 由于它的高度性、生物蓄积性、半挥发性和持久性[1], 已经成为当今一个新的全球性环境问题。2001年5月23