[Sulfuration character of individual particulates of PM10]

SEM/EDX was used to analyze the component and sulfuration characteristics of individual mineral particulates of PM10, which were collected at different times in summer of Harbin. The results indicate that, the 29 species of mineral were identified in summer of Harbin, in which the proportion of clay minerals is over 40%; There are almost no changes in sulfuration in the noon-time period samples, however, the samples collected in the morning and evening show universal sulfuration. In all samples, clay minerals have the highest sulfuration incidence, the average ratio of S/Ca value is 1.0, which is 73 times of noon-sample S/Ca value. The sulfuration degree of samples at different times and meteorological condition show different mechanism of sulfuration. According to different content of mineral elements, mineral grains could be divided into five types: "Si-rich", "Ca-rich", "S-rich", "Fe-rich", "Mg-rich", respectively, showing that the mineral particles mainly come from the crust source; The mineral particles at different times have homology, which indicates that the atmospheric secondary chemical reaction could be the only reason leading to the S rich in morning or evening periods samples, and rule gypsum particles was formed mainly by sulfuration of calcium carbonate mineral salt such as calcite minerals, etc.