Chemical Composition and Possible Sources of Elements in Dustfall in Pingdingshan City

Dustfall samples were synchronously collected at five typical urban functional areas (industrial area, traffic area, residential area, cultural and educational area, residential and commercial mixed area) of Pingdingshan City in Henan Province from May 2008 to April 2009. The principal component elements in dustfall samples were analyzed for concentrations, spatial distribution, sources and contributions to air pollution. The results indicated that Cd, Pb, As, Zn, S and Cu were the dominant polluted elements in the dustfall and their enrichment factors were 44.1, 15.0, 7.8, 3.4, 3.4 and 4.4, respectively. The major ionic species in dustfall were Ca²⁺, SO₄^2-, Cl^-, K⁺, Na⁺, F- and NO₂^-, and their concentrations were 2112, 825, 193, 177, 136, 136 and 130μgg^-1, respectively. The industrial dust and surface soil dust, coal burning dust and constructing dust, motor vehicle emission and metal smelting dust, oil burning and waste incineration should be the dominant sources of dustfull and their contribution were 38.68%, 25.78%, 19.57%, 10.98%, respectively. Therefore, it obviously indicated that the atmospheric dust full was the multi-source pollution in Pingdingshan.