KMS Chongqing Institute of Green and Intelligent Technology, CAS
Highly time-resolved characterization of water-soluble inorganic ions in PM2.5 in a humid and acidic mega city in Sichuan Basin, China | |
Tian, Mi1; Wang, HuanBo1; Chen, Yang1; Zhang, LeiMing2; Shi, GuangMing1; Liu, Yuan1; Yu, JiaYan3; Zhai, ChongZhi3; Wang, Jun3; Yang, FuMo1,4,5 | |
2017-02-15 | |
摘要 | To investigate the characteristics of water-soluble inorganic ions (WSIIs) in Chongqing, a well-known foggy and acid region in southwestern China, hourly real-time concentrations of five cations (Na+, K+, Ca2+, and Mg2+) and six anions (F-, Cr-, NO2-, NO3-, PO43-, and SO42-) in PM2,5 during winter (from Dec. 18, 2015 to Mar. 20, 2016) in Chongqing were collected by applying In-situ Gas and Aerosol Compositions Monitor. The hourly total concentration of WSIIs was 38.5 mu g/m(3) on average, accounting for 57% of PMz5 mass concentration. Secondary inorganic aerosols (NH4+, NO3-, and SO42-) were dominant WSIIs, accounting for 91% of WSIIs mass. Compared to ten years ago, SO42- concentrations were decreased by 31% but NO3- levels were doubled, likely indicative of sharply enhanced contribution to fine particle pollution from mobile sources over stationary sources. NO3- originated from the current fluxes of NH3 and HNO3 onto sulfate particles and/or from in-cloud processes were critical pathways under humid conditions in the study area. Water content and/or RH might be important factors controlling nitrate formation. Trajectory analysis manifested that aerosol pollutions in Chongqing were mostly caused by local emissions. (C) 2016 Elsevier B.V. All rights reserved. |
关键词 | High Time Resolution Water-soluble Ions Particle Acidity Formation Mechanism |
DOI | 10.1016/j.scitotenv.2016.12.048 |
发表期刊 | SCIENCE OF THE TOTAL ENVIRONMENT |
ISSN | 0048-9697 |
卷号 | 580页码:224-234 |
收录类别 | EI |
WOS记录号 | WOS:000395353600023 |
语种 | 英语 |