ZHENG Quan, HU Gongren, WANG Shanshan, ZHAO Lisi, YU Ruilian*

（College of Chemical Engineering, Huaqiao University, Xiamen 361021, China）

Abstract: In order to understand the characteristics in PM2.5 fraction of soil dust in Nanchang city, PM2.5 samples in soil dusts were collected by a resuspension sampler, then the contents of nine water-soluble inorganic ions were detected by ion chromatography. The results showed that the content of total water-soluble ions was 11.126±2.703 mg/g. SO42- showed the highest content (3.568±1.553mg/g) in anions and Ca2+ showed the highest content (1.684±0.545mg/g) in cations. SO42-, NO3-, Ca2+ and Cl- were the main water-soluble ions in PM2.5 of soil dust, accounting for 80.60% of total water-soluble ions. Compared with other cities, the level of water-soluble ions in PM2.5 of soil dust in Nanchang was lower. The ratio of equivalent concentrations of cations to anions was 1.26, suggesting that PM2.5 of soil dust was slightly acidic. Spatial interpolation analysis showed that the contents of water-soluble ions in the southwest of Nanchang city were relatively higher, while most of the eastern and northern parts were at a lower level. The correlation analysis showed that Na+, F-, NH4+ had homology while K+ was not related to other ions. The ratios of NO3-/SO42- were from 0.26 to 0.97, indicating that the effects of fixed sources on the soil dust PM2.5 were more significant.

Key words: Nanchang city; soil dust; PM2.5; water-soluble ions; distribution characteristics

EARTH AND ENVIRONMENT Vol.47, No.3, Tot No.329, 2019, Page 261-267