Abstract：In order to understand the characteristics of water-soluble ion pollution of atmospheric fine particles in the urban area of Chengdu, a total of 102 PM2.5 samples were collected in the urban areas of Chengdu in four seasons. Mass concentrations of particles matter (PM) and its water-soluble ions (NH4+、Ca2+、Na+、Mg2+、K+、F-、NO3-、SO42-、Cl-) were measured and analyzed to characterize its seasonal, with special attentions to characteristics and formation of secondary ions. The results showed that concentration changes of water-soluble ions and atmospheric fine particles in Chengdu’s urban area generally followed the same pattern. Secondary inorganic ions (NH4+、NO3-、SO42-) were the main components of water-soluble ions in PM, accounting for 84.8%. Atmospheric fine particles appeared to be acidic in Spring, Autumn, and Winter, and their in-situ PH values were 1.9, 2.6 and 2.0, respectively. Sulfate and nitrate in the atmospheric PM exhibited differences in its chemical characteristics. For example, the dominating form of sulfate was NH4HSO4, which mainly resulted from heterogeneous reaction processes and was heavily affected by the regional atmospheric transportation; while the dominating form of nitrate was NH4NO3, which mainly resulted from homogeneous reaction processed and was heavily affected by local emissions.
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