正定矩阵因子模型解析鄂尔多斯高原煤矿土壤重金属来源

Positive Definite Matrix Factor Model Analysis of the Source of Heavy Metals in Coal Mine Soils in the Ordos Plateau

为实现高原采煤矿区土壤重金属的源贡献程度的定量化,以研究区表层土壤为研究对象,利用正定矩阵因子模型(positive definite matrix factor,PMF)解析土壤重金属的来源。结果表明:各元素平均质量浓度均低于农用地土壤污染风险管控标准,其中Hg、V、Cr、Cu、Zn、Cd、Pb是内蒙古土壤背景值的33.20、1.41、1.42、2.83、3.57、2.96和1.48倍。土壤重金属累积主要受煤炭开采、化石燃料燃烧、大气交通的影响,相对贡献率分别为23.3%、42.4%、34.3%。另外,将PMF模型与地统计空间分析结合,可以进一步明确贡献源的分布情况,对于采煤矿区土壤重金属污染治理具有实际意义。

In order to quantify the source contribution of heavy metals in the soil of the plateau coal mining area,the positive definite matrix factor model(PMF)was used to analyze the source of heavy metals in the surface soil of the study area.The results show that the average mass concentration of each element is lower than the soil pollution risk control standards for agricultural land,and the Hg,V,Cr,Cu,Zn,Cd and Pb are 33.20,1.41,1.42,2.83,3.57,2.96 and 1.48 times of the soil background value in Inner Mongolia.The accumulation of heavy metals in the soil is mainly affected by coal mining,fossil fuel combustion,and atmospheric traffic,and the relative contribution rates are 23.3%,42.4%,and 34.3%.In addition,the combination of PMF model and geostatistical spatial analysis can further clarify the distribution of contribution sources,which is significant for soil heavy metal pollution control in coal mining areas.