ZHANG Yong1,2, CHEN Rongxiang1,2， CHEN Zhuo3，BAO Yuxin1,2
(1. Medical and Biological Research center, Zunyi Medical University, Zunyi, 563003, China;
2. Research Center for physical and chemical analysis and testing engineering technology, Zunyi, 563003, China;
3. College of Chemistry and Material Science, Guizhou Normal University, Guiyang, 550001, China)
Abstract: In order to understanding the contamination characteristics and sources of water-soluble ions (WSIs) in PM2.5 in the Zunyi city, a total of 120 PM2.5 samples were collected at two sampling sites from June 2018 to May 2019. The concentrations of WSIs were measured by the ion chromatography. The results showed that concentrations of PM2.5 in Zunyi were higher in winter and spring and lower in autumn and summer during the sampling period with an annual average of 47.6±19.3 μg/m3. The average concentration of WSIs was 13.74μg/m3, the concentration order of 8 kinds WSIs was SO42->NO3->NH4+>Ca2+>K+>Cl->Na+>Mg2+, and the seasonal variations of WSIs concentrations were similar to that of PM2.5. In general, SNA (SO42-、NO3- 、NH4+) were the main WSIs, accounting for 83.8％of total inorganic ions. The correlation analysis showed that most of NH4+ existed in the forms of (NH4)2SO4, NH4HSO4 and NH4NO3. [NO3-]/[SO42-] value was less than 1 indicated that the stationary sources should be the dominant contribution source. According to the principal component analysis, WSIs mainly came from coal combustion, transportation, soil dust and construction dust.
Key words:PM2.5; water-soluble ions; pollution characteristics; source apportionment; Zunyi
EARTH AND ENVIRONMENT Vol.48, No.5, Tot No.337, 2020, Page 552-557
