摘要
针对某搬迁化工厂铬渣堆场及周边土壤,分层分区采集样品分析重金属含量,从生态和人体健康角度对土壤Cr,Ni,Cu,As进行风险评估。结果表明土壤Cr、Cr(Ⅵ)污染较为严重,集中在第一(0 m^1.5 m)和第二层(1.5 m^3 m);Cu、As、Ni污染较轻,集中在第一层。生态风险评估表明随深度增加,潜在生态危害指数降低。生态风险顺序为Cr>Ni>As>Cu。健康风险评估表明各层土壤均存在Cr(Ⅵ)致癌风险,其余重金属在第一和第二层存在可接受非致癌风险。
The distribution of heavy metals in soil around the chromium slag contaminated site at a chemical plant was investi-gated by collecting soil samples in different parts of layers. At the same time, a health risk assessment model and Hakanson＇s po-tential ecological risk assessment model were used to evaluate the soil quality based on contents of heavy metals （ Cr, Ni, Cu, As）.The results showed that Cr, Cr（ VI ）had reached the severity pollution level which mainly distributed on the first layer（0 - 1.5 m）and second layer （ 1.5 m - 3 m）. Ni, Cu and As were in minor pollution level which mainly distributed on the first layer.Hakanson＇s potential ecological risk index evaluation showed that the values of ecological risk index were decreasing while thedepth increased. The order for Hakanson＇s potential ecological risk indexofheavy metals were Cr 〉 Ni 〉 As 〉 Cu. The human riskassessment indicated that adults and childrenexposed to Cr（ VI ） in all layers would suffer carcinogenic risk. The hazard indices ofCr, Ni, Cu and As lessthanunity mean thatthenon - carcinogenicheahhrisk was acceptable.
出处
《环境科学与管理》
CAS
2014年第7期172-176,共5页
Environmental Science and Management
基金
建设场地污染土的快速诊断与土工处置关键技术研究(13231202300)
关键词
铬渣堆场
重金属污染
生态风险
人体健康风险
chromium slag contaminated site
heavy metalpollution
ecological risk
human health risk
