基于高分辨率MARGA分析桂林市PM<sub>2.5</sub>水溶性离子特征

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Abstract

The composition of PM_2.5 was serially on-line monitored by using Monitor for Aerosols and Gases in Ambient Air (MARGA ADI 2080) at atmosphere monitoring sites of Guilin in a time span of February 17 to March 24, 2017 continuously. Composition characteristics of water-soluble inorganic matter, secondary conversion mechanism and aerosol acidity were analyzed combining with environmental monitoring data and meteorological monitoring data. The results shown that variability of 8water-soluble ions concentration was in consistent with the trend of PM_2.5 varieties in Guilin. The average mass concentration of the total water-soluble ions was 29.27μg/m³, and the average mass concentration of three secondary water soluble ions SO₄^2-, NH₄⁺and NO₃^- was 26.91μg/m³, accounting for 93.50% of PM_2.5, indicating that secondary water-soluble ions were the major components of PM_2.5 in Guilin. There was a significant positive correlation between secondary water-soluble ions, namely SO₄^2-, NH₄⁺ and NO₃^- (all the correlation coefficients were over 0.80), indicating that the mechanism of evolution and deposition of secondary water-soluble ions in the atmosphere are similar to each other. Visibility declined in terms of power function with the increase of the water-soluble ions, especially secondary water-soluble ions despite if there was rain fell or not. When the rain fell significantly (accumulated rainfall of 24hours≥10mm), the effect of wet removal was obvious. In sunny days and days of light rainy, the focal point should be the control of vehicle exhaust, biomass burning and dust pollution. SOR and NOR were 0.35 and 0.12, respectively. SO₂ was converted to SO₄^2- by homogeneous and heterogeneous oxidation reactions at the same time. NO_x was mainly converted to NO₃^- by photochemical reactions during the day. A pronounced diurnal cycle was found for most ions and gaseous precursors which could be attributed to their respective sources, formation mechanisms and meteorological conditions. The mean value of CE/AE was 1.5, indicating that most aerosols in Guilin were relatively alkaline. In PM_2.5, SO₄^2-, NO₃^- and Cl^- mainly exist in the forms of (NH₄)₂SO₄, NH₄NO₃ and NH₄Cl, respectively. NH₄⁺ in PM_2.5 was related to local vehicle emissions. Regulatory actions in minimizing traffic emissions may represent the critical step in mitigating haze in Guilin.

Key words： MARGA water-soluble ions PM_2.5 meteorological parameters Guilin

Received: 06 August 2018

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X513

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	Articles by authors
	HUANG Jiong-li
	CHEN Zhi-ming
	MO Zhao-yu
	LI Hong
	LIU Hui-lin
	LI Hong-jiao
	LIANG Gui-yun
	YANG Jun-chao
	ZANG Da-biao
	LI Yong-shan

Cite this article:

HUANG Jiong-li,CHEN Zhi-ming,MO Zhao-yu等. Analysis of characteristics of water-soluble ions in PM_2.5 in Guilin based on the MARGA[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1390-1404.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I4/1390

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