咸宁市大气细颗粒物PM_(2.5)组成来源分析

Compositional Source Analysis of Atmospheric Fine Particulate Matter PM_(2.5) in Xianning City

为研究湖北省咸宁市的大气细颗粒物PM_(2.5)的污染特征及来源情况,于2022年选取咸宁市内2个环境受体点位作为采样点,对不同季节的PM_(2.5)进行采集,对细颗粒物PM_(2.5)的组成成分及来源进行统计分析:基于采样情况构建本地PM_(2.5)的特征源谱,利用化学质量平衡模型CMB对PM_(2.5)的来源进行了解析。结果表明:咸宁市大气细颗粒物PM_(2.5)的季节浓度均值呈现为冬季>秋季>春季>夏季的变化趋势,PM_(2.5)的主要组成包括水溶性无机盐与含碳组分,一次来源解析结果显示PM_(2.5)的主要贡献源是二次气溶胶,贡献率在47.15%;二次来源解析结果显示贡献最大的是工业源和机动车,贡献率分别为34.86%和28.94%。根据上述分析结果,咸宁市在大气细颗粒物PM_(2.5)的治理方面,应采用综合治理措施,要关注对工业、机动车排放的控制,以及对能源结构的调整,以获取到更好的治理效果。

In order to study the pollution characteristics and sources of atmospheric fine particulate matter PM_(2.5) in Xianning City,Hubei Province,two environmental receptor sites within Xianning City were selected as sampling points in 2022.PM_(2.5) was collected in different seasons,so that the constituents and sources of fine particulate matter PM_(2.5) could be statistically analyzed.The characteristic source spectra of local PM_(2.5) were constructed based on the sampling conditions,and the source of PM_(2.5) was analyzed by chemical mass balance model CMB.The results of the study show that the seasonal mean concentration of atmospheric fine particulate matter PM_(2.5) in Xianning City shows a trend of winter >autumn > spring > summer,and the main components of PM_(2.5) include water-soluble inorganic salts and carbon-containing components.The primary source analysis results show that the main contributor to PM_(2.5) is the secondary aerosol,with a contribution rate of 47.15%;the secondary source analysis results show that the largest contributors are industrial sources and motor vehicles,with a contribution rate of 34% respectively.The results of secondary source analysis show that the largest contributors are industrial sources and motor vehicles,with contribution rates of 34.86% and 28.94%,respectively.According to the results of the above analysis,Xianning City should adopt comprehensive management measures in the management of fine particulate matter PM_(2.5),and pay attention to the control of industrial and motor vehicle emissions,as well as the adjustment of the energy structure,in order to obtain a better management effect.