Abstract:
Continuous manual sampling of PM
2.5 was carried out at Super site (typical urban site), Kaiping site and Guye site (typical industrial site) in Tangshan City from October 19
th, 2017 to January 31
st, 2018 (autumn-winter season), and the 23 selected inorganic elements was quantitatively analyzed. The compositions and sources of PM
2.5 elements in the atmosphere of Tangshan City were studied. The results show that the mass concentrations of the crustal elements, such as Si, Al, Ca and Na, all showed the highest characteristics in October but the lowest in January. The monthly concentrations of Cr were the highest level at Kaiping site (0.0200 μg/m
3) in October, and then it slightly decreased month by month, which was mainly affected by the reduction and limitation of steel production of the local steel smelting industries. The concentrations of most heavy metals, including Zn, Pb, Mn, Cu, Ni, Se, V, Cd and Co, were high in November or December, which suggests the significant impact of coal-combustion heating. The enrichment factors of Cd, Zn, Pb and Cu reached up to 2677, 616, 422 and 77, respectively, and the extremely strong enrichment implied a strong effect of anthropogenic emissions. Based on the factor analysis, the main sources of PM
2.5 elements in the atmosphere of Tangshan City are the coal-combustion source, mixed source of iron/steel industry emissions and re-suspended dust, transportation emission source and the soil dust source; and their contribution rates to the variance were 56.3%, 21.6%, 7.1% and 5.4%, respectively. Therefore, the elements of atmospheric PM
2.5 of Tangshan City are mainly from coal combustion, industry and dust.