贵州“两控区”城市PM<sub>2.5</sub>及其阴阳离子污染特征

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Abstract PM_2.5 samples were seasonally collected in 9 sites of several cities of Guizhou province (including Guiyang, Anshun, Zunyi, Bijie, Duyun) and one background site of Leigong Mountain during March 2015 to February 2016. Characteristics of PM_2.5 pollution and distributional characteristics of nine ions in PM_2.5 were analyzed. The results showed that the average mass concentration of PM_2.5 was 13.84~167.17μg/m³. The seasonal distribution showed that the average concentrations of PM_2.5 were higher in spring and winter than in autumn and summer. The spatial distribution showed that the pollution of PM_2.5 was more serious in Guiyang, with the average mass concentration of (80.15±30.18)μg/m³. The total ions concentrations in PM_2.5 samples were 7.85~47.02μg/m³. SO₄^2-, NO₃^-, NH₄⁺(SNA) were the dominant ions in PM_2.5, which accounted for 10.00~68.48% of the mass concentration of PM_2.5. In the perspective of seasonal distribution, the mass ratio of SNA/PM_2.5 was higher in winter and summer than in autumn and spring, however, in the perspective of seasonal distribution, the mass ratio of SNA/PM_2.5 in Gaopo and Leigong Mountain was 41.45% and 53.45%, respectively. Basically, PM_2.5 samples were acidulous and the average ratio of AE/CE of PM_2.5 was 1.53. The degree of correlation between NH₄⁺ and SO₄^2-(R=0.67) was higher than that between NH₄⁺ and NO₃^-(R=0.33). The correlation between Ca²⁺ and Mg²⁺ (R=0.57) was obvious. The mean value of[NO₃^-]/[SO₄^2-] in the target area was 0.29, lower than that in other cities. It indicated that stationary emissions were dominant source of PM_2.5 in Guizhou province and the air pollution mainly belonged to coal-burning pattern.

Key words： PM_2.5 ions pollution characteristics haze

Received: 20 June 2016

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X831

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	Articles by authors
	YIN Li-shu
	LI Jin-juan
	GUO Xing-qiang
	LIU Xiao-chun
	YANG Hui-ni

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YIN Li-shu,LI Jin-juan,GUO Xing-qiang等. Pollution characteristics of concentrations and it's ions in PM_2.5 of sulfur and acid-rain Control Zone Cities, Guizhou Province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 416-423.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I2/416

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