室内外PM2.5中金属元素的污染特征及来源

在南京市仙林地区住宅楼内和室外采集PM_2.5样品，分析PM_2.5中金属的污染特征及主要来源.结果显示，室内外PM_2.5平均浓度分别为80.56μg/m³和96.77μg/m³，室内外PM_2.5浓度比（I/O）平均值为0.87.除Mg外，室外其他金属平均值均高于室内.元素Pb室内外浓度相关性最高，R值为0.807.室内外PM_2.5中金属元素Cd、Cu、Pb、Zn、As、Co、Cr和Ni富集程度较高.主成分分析结果显示，室外PM_2.5中金属的主要来源为土壤尘、交通排放、金属冶炼、垃圾焚烧等；室内PM_2.5中金属可能的来源为室外颗粒物的渗透及室内烹饪和家具材料等.

Pollution characteristics and sources of metal elements in indoor and outdoor PM2.5

The pollution characteristics and main sources of metal elements were analysed in PM_2.5 samples collected inside and outside residential buildings in Xianlin districts of Nanjing, China. The results showed that indoor and outdoor PM_2.5 concentrations were 80.56 and 96.77μg/m³, The average indoor and outoloor PM_2.5 concentration ratio (I/O) is 0.87. respectively. Except for Mg, the average values of other metals in outdoor PM_2.5 were higher than indoor values. The correlation between indoor and outdoor concentrations of element Pb was the highest, and the R value was 0.807. Cd, Cu, Pb, Zn, As, Co, Cr and Ni were found to be relatively highly enriched both in indoor and outdoor PM_2.5 samples. Results of principal component analysis showed that the main pollution sources of metals in outdoor PM_2.5 were soil derived dust, traffic emissions, metal smelting and rubbish incineration, etc. The probable pollution sources of metals in indoor PM_2.5 included air infiltration of outdoor particulate matter, indoor cooking and furniture materials, etc.