北京市PM<sub>2.5</sub>水分含量及其变化特征

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Abstract Karl Fischer method can directly determine the water content of PM_2.5 with good precision and accuracy. The method was applied to PM_2.5 analysis of urban stations in Beijing in 2020, and the results showed that the annual average water concentration was (5.0±4.1) µg/m³, and the proportion of PM_2.5was (12.5±4.8) %, which was significantly correlated with PM_2.5 mass concentration. The monthly and seasonal variation trended of water concentration and PM_2.5 mass concentration were basically consistent. The study found that with the increase of air pollution, the water concentration and its proportion in PM_2.5 both showed an increasing trend, and the correlation between them was significantly enhanced. It can be seen that when pollution occurred, the increase of water concentration was conducive to the increase of moisture absorption of particles, thus pushing up the pollution level and enhancing the contribution to PM_2.5 simultaneously. When dust pollution occurred, the humidity was at a low level in the same period, which was not conducive to the growth of moisture absorption of fine particles, the water concentration and its proportion were at a low level. There was a good correlation between water, secondary ions and organic matter, indicating that water provided heterogeneous transformation carrier for gaseous pollutants and promotes the further generation of fine particles such as nitrate, sulfate and organic matter. There was no correlation between water and crustal material, which proved that crustal elements were primary sources and were not affected by water.

Key words： PM_2.5 water content water concentration variation character Karl Fischer method

Received: 17 June 2022

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X513

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	Articles by authors
	CHEN Yuan-yuan
	LI Jun-qi
	CHANG Miao
	SHEN Xiu-e
	LIU Bao-xian

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CHEN Yuan-yuan,LI Jun-qi,CHANG Miao等. Study on water content of PM_2.5 and its variation in Beijing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 70-76.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/70

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