School of Water and Environment, Chang'an University, Xi'an, 710054, China; Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Chang'an University, Xi'an, 710054, China.
School of Water and Environment, Chang'an University, Xi'an, 710054, China.
Environ Pollut. 2022 Jul 15;305:119212. doi: 10.1016/j.envpol.2022.119212. Epub 2022 Apr 5.
Proteinaceous matter is an important component of PM, which can cause adverse health effects and also influence the air quality and climate change. However, there is little attention to high time-resolved variations and potential role of aerosol proteins during haze pollution periods. In this study, PM samples were first collected by a medium flow sampler in autumn and winter in Xi'an, China. Then three high time-resolved monitoring campaigns during haze pollution periods were conducted to determine the evolving characteristics of total protein concentration and explore the interactive relationship between protein and other chemical compositions. The results showed that the average protein concentration in PM in Xi'an (5.46 ± 3.32 μg m) was higher than those in most cities of China, and varied by seasons and air pollution conditions. In particular, the protein concentration in PM increased with the increase of air quality index (AQI). The continuous variations of aerosol proteins during the haze pollution periods further showed that PM, atmospheric humidity and long-distance air mass transport exerted the significant impacts on the protein components in aerosols. Based on the present observation, it is suggested that aerosol proteins might affect the generation of secondary aerosols under haze weather conditions. The present results may provide a new possible insight into the variations and the role of aerosol proteinaceous matter during the formation and development of haze pollution.
蛋白质物质是 PM 的重要组成部分，它可能会对健康造成不良影响，同时也会影响空气质量和气候变化。然而，人们对气溶胶蛋白在霾污染期间的高时间分辨率变化及其潜在作用关注甚少。在这项研究中，首先在中国西安的秋季和冬季使用中流量采样器采集 PM 样本。然后进行了三次高时间分辨率的霾污染期间监测活动，以确定总蛋白浓度的演变特征，并探索蛋白与其他化学成分之间的相互作用关系。结果表明，西安 PM 中的蛋白质平均浓度（5.46±3.32μg m）高于中国大多数城市，且受季节和空气污染状况的影响而变化。特别是，PM 中的蛋白浓度随着空气质量指数（AQI）的升高而增加。霾污染期间气溶胶蛋白的连续变化进一步表明，PM、大气湿度和远距离大气传输对气溶胶中的蛋白成分有显著影响。基于目前的观测结果，提出了气溶胶蛋白可能会影响霾天气条件下二次气溶胶的生成。本研究结果可能为气溶胶蛋白在霾污染形成和发展过程中的变化和作用提供了新的认识。
