采暖期与非采暖期青岛市区PM_(2.5)组分特征及来源分析

Chemical composition characteristics and source analysis of PM_(2.5) in the heating period and non-heating period in urban Qingdao

利用2019年4月6日-2020年4月5日监测数据,分析了青岛市区采暖期和非采暖期大气颗粒物、PM_(2.5)水溶性离子组分的污染特征及来源。结果表明:采暖期PM_(2.5)和PM_(10)浓度均高于非采暖期。NO_(3)^(-)、SO_(4)^(2-)、NH_(4)^(+)等二次无机离子是采暖期和非采暖期的主要离子组分,且采暖期NO_(3)^(-)、NH_(4)^(+)、Na^(+)的占比较非采暖期有所升高。采暖期PM_(2.5)及离子组分浓度升高受多重来源影响,主要与机动车尾气、工业企业排放、供暖燃煤燃烧排放有关,且移动污染源的排放要多于固定污染源。

Based on the monitoring data from April 6,2019 to April 5,2020,the pollution characteristics and sources of particulate matter and PM_(2.5) water-soluble ionic components in the heating period and non-heating period in urban Qingdao were analyzed.The results showed that the concentration of PM_(2.5 )and PM_(10) in the heating period were higher than that in the non-heating period.Secondary inorganic ions such as NO_(3)^(-),SO_(4)^(2-)and NH_(4)^(+)were the main ionic components in the heating period and non-heating period,and the proportion of NO_(3)^(-),NH_(4)^(+)and Na^(+)were higher than that in the non-heating period.The increasation of the PM_(2.5) and ionic components concentration during the heating period was affected by multiple sources,mainly related to motor vehicle exhaust,industrial enterprise emissions and heating coal combustion emissions,and the emissions from mobile pollution sources were more than fixed pollution sources.