The pollution characteristics and source analysis of water-soluble ions in indoor PM2.5 during the Spring Festival in Jingyue Suburb of Changchun City

Abstract

The characteristics of water-soluble ions in indoor PM2.5 during the Spring Festival in Changchun City were analyzed by ion chromatography. The results showed that the main water-soluble ionic components in the indoor and non-combustion periods were SO4 2- and Ca2+, and the concentration of Na+, K+, Mg2+, F-, Cl- and NO3 - increased in the fireworks and firecrackers, among which Cl- and NO3 -. The concentration increased significantly compared with the non-combustion period, and peaked with PM2.5 concentration in the first month of the first month and the first month of the first month; the correlation between NH4 + and SO4 2- during the discharge and non-combustion periods was greater than the correlation between NH4 + and NO3 -, NH4 + Sulfate is preferentially combined with SO4 2-, and secondary ions are mainly in the form of (NH4)2SO4 and NH4NO3. Cluster analysis and correlation analysis indicate that the sources of water-soluble ions in indoor PM2.5 during the Spring Festival can be classified into four categories. Biomass combustion source, automobile exhaust gas source, coal-fired emission source and soil dust, among which the main sources of Na+, K+, Mg2+, Cl-, SO4 2- during the discharge period are the fireworks and firecrackers.