昆山市大气 PM 2．5中无机元素污染特征研究

摘要

应用SEM－EDS结合XRF法测定了2013年8月－2014年5月昆山市7个不同地区大气PM2．5中无机元素的污染水平。研究发现，昆山地区一共可检出40种无机元素，其中主要的22种元素浓度范围在3.02～1113 ng／m3之间，合计为3784 ng／m3；PM2．5中无机元素季节变化明显，呈现春秋季高，夏冬季低的变化特点。无机元素的空间变化不大。通过富集因子的研究，Sc、Ni、Cu、Zn、As、Br、Cd、Pb、Se、Ag、Sn、Sb和Tl等13种元素EF＞10，富集程度非常高，说明人类活动对这些元素的贡献较大。%Inorganic elements in PM2.5 from Aug.2013.8 to May 2014 in different parts in Kunshan were determined by SEM-EDS and XRF.A total 40 kinds of inorganic elements could be found in Kunshan, and the concentration of 22 major elements range from 3.02~1 113 ng/m3 .Their total concentration in PM2.5 was 3 784 ng/m3 .The change of inorganic elements concentra-tion was obvious, high in spring and fall, low in summer and winter.There was little difference in different regions.Enrichment factor of Sc, Ni, Cu, Zn, As, Br, Cd, Pb, Se, Ag, Sn, Sb and Tl was greater than 10 by research, indicating high influence degree of human activities on these elements.