| In this paper, 30 elements in ambient PM2.5 in Nanjing were collected by Teflon filter, digested by microwave and nitric acid hydrogen peroxide hydrofluoric acid, determined by ICP MS. Some measurement parameters were obtained from method study. The elements had good linearity range in 0 μg/L～500 μg/L. Of all the elements, the MDL were 0.02 ng/m3～15 ng/m3, the RSD were 0.5%～19.6%(n=6) and the recoveries ranged in 78.5%～126%. Results from practical sample showed that the annual mean concentration of the detected elements were in 0.03 ng/m3～1 462 ng/m3, accounting for 7.3% of PM2.5 total mass. As, exceeding the national standard, could be a threat to public health. Cd, Zn, Se, Pb, Cu and As from fossil fuel, vehicle exhausting and steelmaking had large enrichment factor. Al, Ba, Be and Fe came from natural sources such as soil and rock for their low enrichment. The concentration of most elements were higher in autumn and winter than that of in spring and summer, in accordance with the seasonal variation of PM2.5. |
