Based on aerosol sampling data in 2016 in Hangzhou, the influences of the G20 emission reduction on inorganic water-soluble ions in particulate matter (PM) was investigated. The results proved that the G20 emission reduction had significant impacts on mass concentration, composition and acid-base properties of water-soluble ions in PM. The concentrations of PM and its water-soluble ions were both reduced by the G20 emission reduction. Among them, the concentrations of NO3-, SO42-, NH4+ and NO2- decreased most obviously, and the concentration decrease of NO3- and SO42- made the concentrations of NH4+, Ca2+ and Cl- the top three ions. The size distributions of SO42-, NO3-, NH4+ and Ca2+ showed mono-modals, and SO42-, NO3- and NH4+ were preferably enriched in the fine particles (within range of 0.65~1.10 mm) while Ca2+ in the coarse particles (within range of 5.80~9.00mm). The size distributions of Na+, Cl- and K+ showed bi-modals with peaks at the particle size of 3.30~4.70mm and 0.65~1.10mm, respectively. the two peaks of Na+ were comparable while K+ and Cl- had higher peak values in the size range of 0.65~1.10mm. The main inorganic salts were changed from NH4NO3, (NH4)2SO4 and NH4Cl to NH4Cl, NaCl and KCl as well as the alkaline enhancement in PM by the G20 emission reduction. The results of this study could provide references for policy formulation and implementation for air quality improvement measures.
毛敏娟, 杜荣光, 吴建. 杭州G20减排措施对大气水溶性离子特征的影响[J]. 中国环境科学, 2019, 39(6): 2283-2290.
MAO Min-juan, DU Rong-guang, WU Jian. Influences of the G20 emission reduction on characteristics of water-soluble ions in PM in Hangzhou. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2283-2290.
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