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| Sources and risk assessment of heavy metals in ambient PM2.5 during Youth Asian Game period in Nanjing |
| ZHANG Xiao-ru1,2, KONG Shao-fei1,2, YIN Yan1,2, LI Li2, YUAN Liang2, LI Qi2, CHEN Kui2 |
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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Abstract In order to evaluate the sources and health risks of heavy metals in PM2.5 around the Youth Asian Game (YAG) period, thirteen heavy elements including V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Cd, Sn, Sb and Pb in PM2.5 were analyzed for a site near the Nanjing Olympic Sport Center during 3~28 August, 2013. Results indicated that the concentrations of heavy metals are different among the pre-, during- and after- YAG period, influenced by both the pollution control regulations and meteorological parameters. Their concentrations are higher for the pre-YAG period than those for during-YAG period. Enrichment factor index indicated that Cu, Zn, Cd, Sn, Sb and Pb are highly enriched elements, with their pollution level decreasing as Cd > Cu > Zn > Sb > Sn > Pb. Cluster analysis implied that industrial emission, coal combustion, road dust and vehicle emissions were the major sources of these heavy elements. During the YAG period, the non-carcinogenic risks raised by heavy elements in PM2.5 through inhalation pathway are less than 1. The risk indexes of five carcinogenic heavy metals are also lower than the thresholds of cancer risk correspondingly.
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Received: 28 May 2015
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