华县公路两侧农田土壤重金属的分布特征与污染评价

Distribution Characteristics and Pollution Assessment on Heavy Metals in Farmland Soil at Both Sides of the Road in Huaxian

为了解关中灌区农田土壤重金属的累积与分布特征,以华县农田土壤为研究对象,按照地理信息要求布点采样,分析表层土壤中5种重金属的含量,运用单因子污染指数进行评价。结果显示:土壤中Pb、Cu、Rb、Sr和Zr元素的平均值分别为71.33mg/kg、42.96mg/kg、82.38mg/kg、293.04mg/kg和142.04mg/kg,其中Rb、Sr、Zr的平均值均小于背景值,表明此区域土壤未受到这3种重金属污染,而Pb、Cu元素的平均值均明显高于背景值,表明研究区受到了重金属Pb、Cu元素不同程度的污染。说明,在调查区域内农业土壤已经出现一定程度的污染。必须采取修复措施,加强对该地区污染的防治工作,避免对人体健康造成危害。

In order to study the accumulation and distribution characteristics of heavy metals in Huaxian,the contents of five kinds of heavy metals in surface soil were analyzed,and then assessed using single factor pollution index.The results showed that the average contents of Pb,Cu,Rb,Sr and Zr were respectively 71.33 mg/kg,42.96 mg/kg,82.38 mg/kg,293.04 mg/kg and 142.04 mg/kg.And among them,the average contents of Rb,Sr and Zr were lower than the background value severally,which indicated that this region was not affected by Rb,Sr and Zr.While Pb and Cu contents were higher than the background value obviously,which meant that the studied area was polluted by Pb and Cu.The investigated region was polluted in a certain degree.Thus,appropriate measures should be adopted to strengthen the prevention and control of pollution in the region and avoid the harm to human health.