秦皇岛庙沟铁矿区域土壤重金属污染分布特征研究

摘要

50 soil samples were obtained from Miaogou surrounding regions. Taken Cd, Cu, Pb, Zn as the target elements were drug and be analyzed by ICP-AES. The spatial distribution characteristics of soil heavy metals in study region were uncovered by IDW. The author introduced single factor index and Nemertine comprehensive index method to evaluated heavy metal contaminated area. The results show that: 1.four kinds of element enrichment degree is Cd > Cu > Pb > Zn, and Cd, Pb,Zn has a similar associated rules in the spatial distribution; 2.the Nemerow index of Miaogou Iron Mine in different areas are:Mining field 1.67,dump 2.63,1.81 tailings,1.41 living area; 3.because of the influence of the perennial dominant wind direction,soil heavy metal elements in the zonal distribution of northeast and southwest line, the average content and pollution degree of heavy metal tailing area is northeast Southwest wind maximum, the wind direction on the minimum.%在庙沟铁矿4个区域(排土场、尾矿库、采矿场和生活区)采集土壤样品50个,以Cd、Cu、Pb、Zn为目标元素,采用ICP-AES电感耦合等离子体原子发射光谱法测定元素含量,借助反距离加权插值法揭示该区域表层土壤中重金属元素的空间分布特征,并通过内梅罗综合指数法对区域重金属污染进行评价.结果表明,4种元素富集程度为Cd>Cu>Pb>Zn, 且Cd、Pb、Zn 3种元素间在空间分布上具有相似性和伴生规律;庙沟铁矿4个区域的综合污染评价指数分别为采矿场1.67、排土场2.63、尾矿库1.81、生活区1.41;由于常年主导风向的影响,矿区土壤重金属元素在东北西南一线的呈带状分布,尾矿库区域重金属的平均含量及污染程度均为下风向的东北方向最大,上风向的西南方向最小.