第十届中国(武汉)国际园林博览会建设区域土壤重金属含量及污染评价

Assessment on Heavy Metal Contents and Pollution in Soil of the 10th China(Wuhan) International Garden Expo Park Construction Area

为了了解第十届中国(武汉市)国际园林博览会建设区域(金口垃圾填埋场及彼邻区三环内)土壤的重金属污染状况,2013年对该区域土壤重金属Cu、Pb、Cd、Cr、Hg和As的含量进行检测;并采用单因子污染指数法和内梅罗综合污染指数法,对2个区域的土壤重金属污染状况进行了评价。结果表明:垃圾填埋区土壤6种重金属的含量平均值均明显高于非垃圾填埋区和湖北省土壤背景值,其中,Cd和Hg含量出现了超标现象,而其他重金属含量均处于国家土壤二级标准范围;单因子污染指数法评价结果显示,该区土壤同时受到了6种重金属的潜在污染,其中,Cd总体污染水平为中度,Hg总体污染水平为轻度,As总体相对安全但有39.4%的样点受到了污染,Cu、Pb和Cr未对土壤造成污染;内梅罗综合污染指数法评价结果显示,土壤重金属综合污染水平为轻度。三环内区域土壤6种重金属的含量平均值均处于国家土壤二级标准范围,但部分区域个别重金属出现了积累与污染;单因子污染指数法评价结果显示,该区土壤未受到这6种重金属的污染,但有个别重金属和点位出现了超标现象,具有轻微生态风险;内梅罗综合污染指数法评价结果显示,土壤重金属综合污染水平为清洁。

In order to investigate the heavy metal pollution situation in soil of the 10th China （Wuhan） International Garden Expo park construction area （Jinkou Landfill and the neighboring third-ring area）, the contents of Cu, Pb, Cd, Cr, Hg and As in soil were tested in 2013. The heavy metal pollution situation of the two areas was evaluated using the single factor pollution index method and Nemerow multi-factor index method. The results showed that the average content of 6 kinds of heavy metals of the landfill area were remarkably higher than that of the non-lanfill area and the soil background value in Hubei Province. Among them, the content of Cd and Hg ex- ceeded standard level, and that of other heavy metals was in the national soil standard level 11. According to the results of single factor pollution index method, the soil was exposed to the potential pollution of six kinds of heavy metal at the same time. Among them, the overall pollution level of Cd was moderate, that of Hg was mild, that of As was relatively safe, but 39.4% of the samples were contaminated, and there was no pollution by Cu, and Pb and Cr did not cause pollution to soil. As showing in Nemerow multi-factor index method, the soil heavy met- als was in mildly polluted. The content of 6 kinds of soil heavy metals of the third-ring area was within the na- tional soil standard level 1I, while some heavy metals in some regions had accumulated and caused pollution. The results of the singlefactor pollution index method showed that the soil in this area was not polluted by these six kinds of heavy ＇metals, but some heavy metals and spots exceeded standard level with slight ecological risk. At the same time, the Nemerow multi-factor index method re- sult showed that the soil was clean from heavy metals.