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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2016, Vol. 10 Issue (5) : 12    https://doi.org/10.1007/s11783-016-0861-y
RESEARCH ARTICLE
Characteristics and mixing state of S-rich particles in haze episodes in Beijing
Jun Hu1,2,3,Fengkui Duan1,2,3,*(),Kebin He1,2,3,*(),Yongliang Ma1,2,3,Shuping Dong4,Xiande Liu5
1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
2. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Tsinghua University, Beijing 100084, China
3. Beijing Key Laboratory of Indoor Air Quality Evaluation and Control (Tsinghua University), Beijing 100084, China
4. Sino-Japan Friendship Environmental Protection Center, Beijing 100029, China
5. Chinese Research Academy of Environmental Sciences, Beijing 100029, China
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Abstract

Four types of S-rich particles are identified by SEM/FESEM-EDX

With on-line observation, characteristics of S-rich particles are discovered

Intensities of formation of S-rich particles are seasonally different

Direct individual analysis using Scanning Electron Microscopy combined with online observation was conducted to examine the S-rich particles in PM2.5 of two typical polluted haze episodes in summer and winter from 2014 to 2015 in Beijing. Four major types of S-rich particles, including secondary CaSO4 particles (mainly observed in summer), S-rich mineral particles (SRM), S-rich water droplets (SRW) and (C, O, S)-rich particles (COS) were identified. We found the different typical morphologies and element distributions of S-rich particles and considered that (C, O, S)-rich particles had two major mixing states in different seasons. On the basis of the S-rich particles’ relative abundances, S concentrations and their relationships with PM2.5 as well as the seasonal comparison, we revealed that the S-participated formation degrees of SRM and SRW would enhance with increasing PM2.5 concentration. Moreover, C-rich matter and sulfate had seasonally different but significant impacts on the formation of COS.

Keywords S-rich particles      Morphology      Element distribution      Mixing state     
PACS:     
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Corresponding Author(s): Fengkui Duan,Kebin He   
Issue Date: 12 July 2016
 Cite this article:   
Jun Hu,Fengkui Duan,Kebin He, et al. Characteristics and mixing state of S-rich particles in haze episodes in Beijing[J]. Front. Environ. Sci. Eng., 2016, 10(5): 12.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-016-0861-y
https://academic.hep.com.cn/fese/EN/Y2016/V10/I5/12
season number sampling time AQI season number sampling time AQI
summer A 11:48–12:13, 28 June, 2014 34 winter a 15:18–15:4311 Jan., 2015 32
B 17:14–17:2830 June, 2014 156 b 9:13–9:1712 Jan., 2015 200
C 14:45–14:531 July, 2014 190 c 18:18–18:2412 Jan., 2015 167
D 9:30–9:422 July, 2014 63 d 23:56–23:59 12 Jan., 2015 270
E 14:00–14:102 July, 2014 99 e 8:30–8:34 13 Jan., 2015 208
F 17:30–17:392 July, 2014 109 f 15:43–15:4913 Jan., 2015 152
G 10:20–10:253 July, 2014 292 g 22:28–22:3213 Jan., 2015 197
H 14:18–14:233 July, 2014 245 h 8:39–8:4314 Jan., 2015 209
I 18:00–18:053 July, 2014 219 i 16:11–16:1414 Jan., 2015 303
j 22:33–22:3614 Jan., 2015 290
k 8:24–8:2615 Jan., 2015 358
l 15:09–15:1015 Jan., 2015 430
m 22:24–22:2515 Jan., 2015 487
n 8:21–8:5116 Jan., 2015 19
Tab.1  Information on filter sampling
Fig.1  Online observations of focus haze episodes in summer and winter. (a) Time series of PM2.5, sulfate in PM2.5, SOR and gas pollutants. (b) Water in PM2.5 and meteorological parameters
Fig.2  Frequency of elements in detected particles
Fig.3  Morphologies, chemical compositions and elements correlative analyses of secondary CaSO4 and SRM. (a) Two morphologies with different scanning time of one secondary CaSO4 in summer episode and its element distribution. Red arrows point to water parts. (b) Relationship between S at.% and Ca at.% of all secondary CaSO4 particles. (c) Morphology of one typical SRM in winter episode and its element distribution. Red arrows point to Ca/S. (d) Relationships between S at.% and Ca at.%, Mg at.%, Si at.% and Na at.% of all SRM particles in summer episode and winter episode, respectively
Fig.4  Morphologies, chemical compositions and elements correlative analyses of SRW and SRO. (a) Morphologies of two typical SRW particles in summer episode and winter episode, respectively. Corresponding elemental mapping pictures of S distribution are on the bottom right corners. (b) Relationship between S at.% and O at.% of all SRW particles in summer episode and winter episode, respectively. (c) Morphologies of two typical COS particles in summer episode and winter episode, respectively. Red arrows point to C-rich matter. Their elemental mapping pictures of C, O, S elements distribution are presented
Fig.5  Relative abundance (%) variation trend of three types of S-rich particles with PM2.5 concentration
Fig.6  Variation trend of S at.% and at.% ratios of S-rich particles in summer episode (a) and winter episode (b), respectively
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