包头公园土壤重金属含量水平及污染评价

为研究包头土壤重金属累积程度及其环境影响,在包头市区4个公园分别采集5个表层土样,分析测定了重金属Pb,Zn,Cd的含量,并用单因子指数法和潜在生态危害指数法进行了环境质量评价.结果显示,Zn含量高出背景值4~5倍,富集程度高,但潜在生态危害指数较小;Cd的含量高出背景值1~2倍,富集程度虽小,但潜在生态危害指数最高.Pb,Cu也有不同程度污染.交通运输和工业废弃物排放,是造成公园土壤中重金属含量积累的重要因素.

Concentration determination and contamination evaluation for heavy metals in the soils of Baotou parks

Five for each and total of 20 soil samples were collected in four urban parks of Baotou.Cu,Zn,Pb and Cd concentrations were analyzied in order to understand their accumulation extents.Environment quality evaluation was conducted adoping the single factor index and the potential ecology risk index(RI).Results showed that although Zn has the highest concentration,which is 4~5 times of the background value,but with a small RI.On the contrary,Cd accumulated only 1~2 times of the background value but has the highest RI.Furthermore,both Pb and Cu have accumulated 1~2 times,showed pollution to some extent.Industrial effluents and vehicle emission were the factors for heavy metal enrichment,prevention and preservation can not be neglected due to fact that the pollution sources still exist.