滤膜对PM2.5采样和组分分析准确性的影响

以大流量采样器采样为例，通过多个采样器应用不同滤膜多周期现场采样、滤膜的孔隙结构与组成分析以及不同采样介质背景下PM2.5组成分析，研究了不同滤膜对PM2.5浓度测定和组分分析的影响。结果表明：聚四氟乙烯（PTFE）滤膜和玻璃纤维滤膜、石英滤膜对于PM2.5浓度值的测定一致性很好，但PTFE滤膜的测定含量较玻璃纤维滤膜和石英滤膜略低；其原因与滤膜的微观结构和颗粒物在滤膜上的聚集状态有关；空白滤膜的背景值差异影响PM2.5中化学组分浓度的测定。

Impacts of sampling filters on PM2.5 concentration and composition analysis accuracy

Based on multitemporal PM2.5 sampling with three types of filters in two high-volume air samplers,the effect of the filters on the PM2.5 concentration and composition was analyzed by pore microstructure observation of the filter and composition determination of the filter and PM2.5 with SEM,ICP-MS,XRF,and IC.The results showed that the PM2.5 concentrations determined with the PTFE,glass fiber,and quartz filters were consistent with each other,but the concentration measured by the PTFE filter was slightly lower than it was when measured by the other filters.The reason for this may be associated with the microstructure of the filters and aggregation state of the particles on different filters.The component discrepancy in the backgrounds of different blank filters interfered with the determination of the chemical components of PM2.5.