التفاصيل البيبلوغرافية
| العنوان: |
[Water-soluble Inorganic Ion Content of PM 2.5 and Its Change Characteristics in Urban Area of Beijing in 2022]. |
| المؤلفون: |
Chen YY; Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Ecological and Environmental Monitoring Centre, Beijing 100048, China., Cui D; Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Ecological and Environmental Monitoring Centre, Beijing 100048, China., Zhao ZX; Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Ecological and Environmental Monitoring Centre, Beijing 100048, China., Chang M; Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Ecological and Environmental Monitoring Centre, Beijing 100048, China., Jing K; Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Ecological and Environmental Monitoring Centre, Beijing 100048, China., Shen XE; Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Ecological and Environmental Monitoring Centre, Beijing 100048, China., Liu BX; Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Ecological and Environmental Monitoring Centre, Beijing 100048, China. |
| المصدر: |
Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2024 May 08; Vol. 45 (5), pp. 2537-2547. |
| نوع المنشور: |
English Abstract; Journal Article |
| اللغة: |
Chinese |
| بيانات الدورية: |
Publisher: Ke xue zhu ban she Country of Publication: China NLM ID: 8405344 Publication Model: Print Cited Medium: Print ISSN: 0250-3301 (Print) Linking ISSN: 02503301 NLM ISO Abbreviation: Huan Jing Ke Xue Subsets: PubMed not MEDLINE; MEDLINE |
| أسماء مطبوعة: |
Original Publication: Beijing : Ke xue zhu ban she, |
| مستخلص: |
To explore the content and variation characteristics of water-soluble ions of atmospheric fine particles (PM 2.5 ) in a Beijing urban area and put forward the pollution prevention and control scheme, the water-soluble ions, gaseous precursors (SO 2 , NO 2 ), and meteorological factors (temperature, RH) of PM 2.5 in 2022 were analyzed and determined. The results showed that the water-soluble ions with the highest proportion in PM 2.5 in the Beijing City urban area were NO 3 - , NH 4 + , and SO 4 2- , accounting for 52.7% of PM 2.5 . The mass concentrations of PM 2.5 and SNA were lower than the historical results, whereas the proportion of SNA, SOR, and NOR was higher than the historical results. This showed that the fine particulate matter pollution in Beijing has been significantly improved, but it still has strong secondary pollution characteristics. NO 3 - /SO 4 2- (2.2) was higher than those of historical and nearby provinces and cities, reflecting the expanding influence of mobile sources. In terms of seasonal variation, PM 2.5 showed the characteristic of high in autumn and low in summer. The proportion of NO 3 - was the highest in autumn, spring, and winter; the proportion of SO 4 2- was the highest in summer; and the proportion of NH 4 + changed little in each season. The seasonal variation rules of NOR and SOR were almost opposite, which reflected the difference in transformation factors between NOR and SOR. The main forms of SNA in the Beijing urban area were NH 4 NO 3 and (NH 4 ) 2 SO 4 . The neutralization degree of cations and anions was the highest in winter, the cation NH 4 + was slightly insufficient in summer, and NH 4 + was in excess in spring and autumn. The Beijing urban area was an ammonia-rich environment. In terms of pollution level, RH, particulate matter moisture, and water-soluble ions mass concentration all increased with the increase in pollution level, and SNA increased fastest, with its proportion in PM 2.5 increasing first and then stabilizing, whereas the contribution rate of other water-soluble ions decreased gradually. In terms of spatial distribution, the mass concentration relationship of SNA at the central urban area and suburbs was NO 3 - > SO 4 2- > NH 4 + , which reflected the pollution characteristics dominated by NO 3 - . The highest contribution rate of SNA to PM 2.5 occurred in the eastern region, the central urban area, and the transmission point, indicating that the secondary reaction was relatively active in the central urban area and the eastern region, and the regional transport was also an important source of secondary ions. |
| فهرسة مساهمة: |
Keywords: atmospheric fine particles （PM2.5）; concentration; secondary inorganic ions （SNA）; variation characteristics; water-soluble inorganic ions |
| تواريخ الأحداث: |
Date Created: 20240417 Latest Revision: 20240417 |
| رمز التحديث: |
20240417 |
| DOI: |
10.13227/j.hjkx.202309046 |
| PMID: |
38629519 |
| قاعدة البيانات: |
MEDLINE |
