頁籤選單縮合
題 名 | Characteristics of Water-soluble Inorganic Components and Acidity of PM₂﹒₅ in a Coastal City of China |
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作 者 | Wu, Xin; Deng, Junjun; Chen, Jinsheng; Hong, Youwei; Xu, Lingling; Yin, Liqian; Du, Wenjiao; Hong, Zhenyu; Dai, Nanzhen; Yuan, Chung-shin; | 書刊名 | Aerosol and Air Quality Research |
卷 期 | 17:9 2017.09[民106.09] |
頁 次 | 頁2152-2164 |
分類號 | 445.63 |
關鍵詞 | Water-soluble inorganic ions; Secondary ions; Sea-salt aerosol acidity; Coastal city; |
語 文 | 英文(English) |
英文摘要 | To investigate the characteristics of water-soluble inorganic ions (WSIIs) of PM2.5 and aerosol acidity in a coastal city, 352 samples were collected at four sites representing four functional zones (FJ: living town; XY: industrial area; TZ: scenery areas; HR: harbor) in Xiamen, China in 2015–2016. Mass concentrations of PM2.5, nine WSIIs, total acidity and in-situ acidity of aerosol/non-sea-salt aerosol were measured. Overall, the mean mass concentrations of PM2.5 in the study area in spring, summer, autumn and winter were 57.5 ± 22.3, 28.1 ± 12.6, 46.8 ± 18.3 and 62.4 ± 22.1 µg m–3, respectively. WSIIs accounted for 36%–56% of PM2.5 at four sites. Secondary ions (non-sea-salt SO4 2–, NO3 – and NH4 + ) contributed more than 74% to total WSIIs. Neutralization degree distributions indicated that 79.5% of PM2.5 was acidic. Total acidity and in-situ acidity both showed obvious seasonal variations, exhibited the peak values of 193.20 and 130.17 nmol m–3 at HR site in summer. Sea-salt contributed 2.58%–17.74% to acidity in four seasons. The normalized ammonium concentration ([NH4 + ]/[SO4 2–]) and normalized nitrate concentration ([NO3 – ]/[SO4 2–]) showed greater correlation coefficients after eliminating the ammonium-poor data points (greater than 0.66), especially at HR site. NH4HSO4 was the major form of WSIIs in PM2.5 and the formation of aqueous HNO3 could enhance aerosol acidity. |
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