Variations and sources of protein concentrations in PM2.5 during winter haze pollution process in Xi'an
ZHANG Hao-yue1, LI Yan-peng1,2, DU Sheng-li1, ZHANG Gao-shan1, ZHAO Lu-yao1
1. School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China; 2. Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Chang'an University, Xi'an 710054, China
Abstract:In this study, PM2.5 samples were collected during three haze episodes in Xi’an, China occurring from December, 2019 to January, 2020. Total proteins in PM2.5 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 PM2.5 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 PM2.5, indicating that the sources of aerosol proteins were associated with coal and biomass combustion. The concentrations of NO3- and SO42- showed a significant and positive correlation with total proteins, suggesting that the proteins may be involved in the oxidation of NOx 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.
张皓月, 李彦鹏, 杜胜利, 张高山, 赵璐瑶. 西安市冬季霾污染过程PM2.5上蛋白质的浓度变化与来源分析[J]. 中国环境科学, 2022, 42(5): 2025-2033.
ZHANG Hao-yue, LI Yan-peng, DU Sheng-li, ZHANG Gao-shan, ZHAO Lu-yao. Variations and sources of protein concentrations in PM2.5 during winter haze pollution process in Xi'an. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2025-2033.
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