摘要
以某大型灯具生产企业场地为研究对象,对砷、钼、钨三种土壤特征污染物的空间分布及健康风险进行分析。结果表明,以单项污染指数法评价,三种污染物在场地的整体污染水平均为清洁、尚清洁等级,但均存在超标样品。污染物在表层土壤中的分布极不均匀,浓度变异系数分别为2.53、3.99、1.68,超标点位主要位于生产车间、仓库等区域,为企业历史工业生产活动所致,办公生活区存在局部污染超标,应为场地多次改扩建时地面平整,污染土壤及建筑垃圾的转移、堆填所致。污染物的垂向分布主要受土层性质影响,超标样品大多集中在0~1.5m深度内的杂填土层,在杂填土厚度较薄、污染浓度较高的区域,污染垂向迁移幅度较大,最大可达3.5~4.5m。在一类用地条件下,汞、钼、钨的非致癌风险分别为11.37、15.00、6.51,均超过了可接受水平,场地在重新开发利用前需开展修复管控。
The site of a large lamp manufacturer was taken as a research object in this paper,and the spatial distribution and health risks of three soil specific pollutants,arsenic,molybdenum and tungsten,were analyzed.The results indicated that based on the single pollution index method,the overall pollution levels of the three pollutants on the site were classified as clean or relatively clean,and some samples were over the limits.The distribution of these pollutants in the surface soil was highly uneven,with variation coefficients being 2.53,3.99,and 1.68,respectively.The over⁃limit points were mainly located in areas such as production workshops and warehouses,mainly due to previous production.There were also some over⁃limit pollution spots in the office areas,likely due to previous transportation and fill of polluted soil and construction debris while site leveling for reconstruction and expansion.The vertical distribution of pollutants was primarily influenced by characteristics of soil layers,with most over⁃limit samples located in the miscellaneous fill layer within 0~1.5 m depth.In areas with thin miscellaneous fill layer and high pollution concentration,vertical migration of pollutants was significant,reaching the depth up to 3.5~4.5 m.Under Classification I land use condition,the non⁃carcinogenic risk quotients of mercury,molybdenum,and tungsten were 11.37,15.00,and 6.51,respectively,all of which exceed acceptable limits.Remediation and control measures need to be implemented before the site is redeveloped.
作者
杨梦凡
李彦希
程伟
王笑岩
安学超
YANG Meng-fan;LI Yan-xi;CHENG Wei;WANG Xiao-yan;AN Xue-chao(Center International Group Co.,Ltd.,Beijing100173,China)
出处
《四川环境》
2024年第5期154-160,共7页
Sichuan Environment
关键词
灯具企业
污染场地
重金属
污染空间分布
健康风险评估
Lamp enterprises
contaminated site
heavy metals
spatial distribution of pollutant
health risk evaluation
