北京市PM_(2.5)中水溶性有机碳污染特征研究

Characteristics of Water-soluble Organic Carbon Pollution in PM_(2.5) in Beijing

于2019年的1月1日—12月31日采集了315个细颗粒物(PM_(2.5))样品,用于研究北京大气气溶胶中水溶性有机碳(WSOC)的特点和来源。结果表明:2019年北京城区WSOC平均质量浓度为4.58μg/m^(3),浓度范围为0.50~23.87μg/m^(3)。WSOC的质量浓度呈现了显著的季节差异,按照从大到小的顺序排列依次是冬季>秋季>春季>夏季。相关性分析结果表明在夏、秋季受到一次源和二次源的共同影响,而在春、冬季受到一次源的影响更大,在夏、秋季二次源影响高于春、冬季。在冬季WSOC受到燃煤的影响。

315 samples of fine particulate matter(PM_(2.5))were collected to study the characteristics and sources of water-soluble organic carbon(WSOC)in atmospheric aerosols over Beijing throughout 2019.The results showed that the average mass concentration of WSOC in Beijing urban area in 2019 was 4.58μg/m^(3),with a concentration range of 0.50~23.87μg/m^(3).The mass concentration of WSOC showed significant seasonal differences,in descending order:winter>autumn>spring>summer.The results of correlation analysis showed that the primary and secondary sources were affected by both in summer and autumn,but the primary sources were more affected in spring and winter,and the secondary sources were more affected in summer and autumn than in spring and winter.WSOC is affected by coal burning in winter.