西安市冬季霾污染过程PM<sub>2.5</sub>上蛋白质的浓度变化与来源分析

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Abstract In this study, PM_2.5 samples were collected during three haze episodes in Xi’an, China occurring from December, 2019 to January, 2020. Total proteins in PM_2.5 were determined via bicinchoninic acid assay (BCA). Other chemical compositions such as water-soluble ions and dicarboxylic acids were analyzed using ion chromatography (IC) and gas chromatography-mass spectrometry (GC/MS). The correlation analysis combined with backward trajectory model of air mass were then used to examine the response of aerosol proteins to haze pollution process and their potential role in the formation and development of haze pollution. The results showed that the average protein concentration in PM_2.5 was pretty high in Xi’an (about (5.587±2.421)μg/m³) during the winter haze pollution episodes. A time-resolved variation in total proteins was characterized by slightly higher concentration at night than that in daytime. There was a significantly positive correlation between the concentrations of total protein and those of Cl^-and K⁺in PM_2.5, indicating that the sources of aerosol proteins were associated with coal and biomass combustion. The concentrations of NO₃^- and SO₄^2- showed a significant and positive correlation with total proteins, suggesting that the proteins may be involved in the oxidation of NO_x and SO₂. In highly humid conditions, protein aerosols are prone to hygroscopicity growth, and they are also easy to adsorb gaseous pollutants to promote heterogeneous reactions, which may be conducive to the generation of secondary aerosols during haze pollution.

Key words： PM_2.5 haze pollution protein water-soluble inorganic ions dicarboxylic acids

Received: 09 October 2021

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X513

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	Articles by authors
	ZHANG Hao-yue
	LI Yan-peng
	DU Sheng-li
	ZHANG Gao-shan
	ZHAO Lu-yao

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ZHANG Hao-yue,LI Yan-peng,DU Sheng-li等. Variations and sources of protein concentrations in PM_2.5 during winter haze pollution process in Xi'an[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2025-2033.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2025

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