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| The concentrations of Cl-,SO42-,NO3- and NH4+ in atmospheric PM2.5 in Chengdu |
| CAO Xia, YOU Fan, ZHOU Mao-jun, DING Jian, YONG Li, HU Bin
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| Sichuan Provincial Center for Disease Control and Prevention,Chengdu,Sichuan 610041,China |
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Abstract Objective To understand the concentrations and distribution characteristics of Cl-,SO42-,NO3- and NH4+ in atmospheric PM2.5 in Chengdu,and to provide the basis for PM2.5 prevention. Methods We set Qingyang,Gaoxing and Pengzhou as three monitoring sites to collect the samples of atmospheric PM2.5 from October 2014 to May 2015. Then we employed ion chromatography to determine the concentrations of Cl-,SO42-,NO3- and NH4+ in the test samples,and compared their distribution characteristics of different sampling time and sites.Results The monthly mean concentrations of SO42-（0.051 2-0.144 4 mg/m3）and NH4+（0.015 1-0.127 7 mg/m3）were relatively higher,while Cl- （0.001 1-0.029 1 mg/m3）and NO3-（0.001 0-0.030 3 mg/m3）were relatively lower among the three monitoring sites in Chengdu. The concentrations of four water-soluble ions in PM2.5 were significantly different in winter,spring and autumn,with the highest values all appearing in winter（P<0.05）. The monthly mean concentrations of four water-soluble ions were different in different sampling time（P<0.05）. The highest concentration of Cl- was（0.029 1±0.011 6）mg/m3 in Pengzhou in January 2015;SO42- was（0.134 4±0.052 5）mg/m3 in Qingyang in January 2015;NO-3 was（0.030 3±0.021 0）mg/m3 in Gaoxin in January 2015;NH4+ was（0.127 7±0.028 6）mg/m3 in Pengzhou in February 2015;The concentrations of Cl- in different monitoring sites had significant differences（P<0.05）,while the concentrations of NO3-,SO42- and NH4+ all had no significant differences（P>0.05）. There was no interaction between monitoring sites and sampling time（all P>0.05）.Conclusion All the four inorganic water-soluble ions in PM2.5 in Chengdu had the highest concentrations in winter. The concentration of Cl- was also related to the monitoring site.
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Received: 29 May 2018
Revised: 12 September 2018
Published: 04 December 2018
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