基于BM和PMF模型的库尔勒市地表灰尘重金属来源解析

Source Analysis of Heavy Metals in Surface Dust in Korla Based on Barycenter Model and PMF Model

在新疆库尔勒市采集54个代表性地表灰尘样品,分析其中Hg、Cd、As、Pb、Cr和Cu等6种元素含量。采用重心模型(BM模型)和正矩阵分解模型(PMF模型),分析地表灰尘重金属元素主要来源。结果表明:库尔勒市地表灰尘中Hg、Cd、As、Pb、Cr和Cu等元素的含量重心均偏离几何中心,地表灰尘中重金属元素含量分布存在不均衡性。研究区地表灰尘中Hg和Pb受到工业、交通来源及煤炭燃烧等混合污染源的影响,As受到成土母质的影响,Cd、Cr和Cu主要受到交通排放的影响。BM模型在确定地表灰尘重金属污染来源研究上有一定的应用前景。

The content of Hg,Cd,As,Pb,Cr and Cu in 54 representative surface dust samples from Korla,Xinjiang,were detected.The main source of the heavy metals were analyzed based on BM(Barycenter)model and PMF(positive matrix factorization)model.The results indicated that the content center of Hg,Cd,As,Pb,Cr and Cu in the surface dust of Korla deviated from the geometrical center.The distribution of these elements was uneven.Hg and Pb in the samples originate from industry,transportation and coal combustion,As depended upon the parent material of soil,Cd,Cr,and Cu were mainly affected by traffic emission.BM model had certain application prospects in source analysis of heavy metals in surface dust.