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| Pollution characteristics and sources of metal elements in indoor and outdoor PM2.5 |
| XU Yue, WANG Ke, LIU Xue-mei, LI Hui-ming, QIAN Xin |
| State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China |
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Abstract The pollution characteristics and main sources of metal elements were analysed in PM2.5 samples collected inside and outside residential buildings in Xianlin districts of Nanjing, China. The results showed that indoor and outdoor PM2.5 concentrations were 80.56 and 96.77μg/m3, The average indoor and outoloor PM2.5 concentration ratio (I/O) is 0.87. respectively. Except for Mg, the average values of other metals in outdoor PM2.5 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 PM2.5 samples. Results of principal component analysis showed that the main pollution sources of metals in outdoor PM2.5 were soil derived dust, traffic emissions, metal smelting and rubbish incineration, etc. The probable pollution sources of metals in indoor PM2.5 included air infiltration of outdoor particulate matter, indoor cooking and furniture materials, etc.
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Received: 09 September 2017
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