大气颗粒物PM<SUB>10</SUB>和PM<SUB>2.5</SUB>元素组成的中子活化分析

大气颗粒物PM₁₀和PM_2.5元素组成的中子活化分析

摘要: 在北京市郊区设立采样点，使用Gent采样器收集PM₁₀（直径小于10 μm）和PM_2.5（直径小于2.5 μm）大气颗粒物。利用仪器中子活化分析（INAA）法对2005年春、夏两季采集的样品进行测量，用k₀法中子活化分析（ADVNAA软件）对元素含量进行定量计算，得出春季PM_2.5平均浓度为41.43 μg/m_³，PM₁₀平均浓度为140.82 μg/m³；夏季PM_2.5平均浓度为50.63 μg/m³，PM₁₀平均浓度为119.10 μg/m³。通过分析可以看出，样品中污染元素随季节、气象条件变化，并通过富集因子来寻找污染元素的来源。

Abstract: A sampling station was set up in the suburb of southwest Beijing. PM_2.5 (diameter <2.5 μm, fine) and PM₁₀ (diameter <10 μm, coarse) airborne particulate matter (APM) were collected by a Gent stacked filter unit sampler. The samples, collected during spring and summer of 2005, were analyzed by k₀ instrument neutron activation analysis (INAA) using the software of ADVNAA. The average volume concentrations of PM_2.5 and PM₁₀ APM during spring season are found to be 41.43 μg/m³ and 140.82 μg/m³, respectively, while those during summer season are 50.63 μg/m³ and 119.10 μg/m³, respectively. The major pollution elements and their variations with season and special weather condition are primarily identified by enrichment factor analysis.