Source identification of trace elements in the atmosphere during the second Asian Youth Games in Nanjing, China: Influence of control measures on air quality

Özet

An intensive field campaign was carried out at Nanjing Bureau of Meteorology located on the Jiangxinisland during July 28-Aug 30, 2013. Concentrations of 15 trace metal elements (Al, V, Cr, Mn, Co, Ni, Cu,Zn, As, Se, Sr, Cd, Ba, Pb Pd) were measured in the daily collected PM2.5 filter samples by the inductivelycoupled plasma mass spectrometry (ICP-MS). Mass loading of Zn was found to be higher than otherelements, even higher than Al, indicating that the airborne Zn in this region may have multiple sourcesincluding traffic emissions, emissions from ship paintings and ship-fuel burning. Six sources, which arecoal combustion, soil dust, traffic, industry, electroplate and electronic pollution, and Cr source wereidentified by combining positive matrix factorization (PMF) analysis and the control measures of airquality during the Asian Youth Games (Aug 16e24, 2013, “control period”). Source contributions fromcoal combustion and industry were obviously reduced during the control period, while contributionsfrom traffic, electronic pollution and Cr source increased, indicating the importance of the specificpollutants due to anthropogenic activities. Based on the meteorological data and air mass back trajectories,air parcels originated from southeast direction may deliver pollutants from industrial emissionscontaining elements of Co, Zn, Cd, Ba, Pb and Pd, while the air masses arriving in Nanjing from directionsof Fujian and Zhejiang provinces contained high concentrations of As, Sr, and Cu, likely from combustionsources.