室内可吸入肺颗粒物PM_(2.5)采集实验与SEM观察

Collection experiments and SEM observation for the indoor PM_(2.5) samples

采用自行搭建的大气颗粒物采集平台,对室内可吸入肺颗粒物PM2.5进行了采集实验,并运用扫描电子显微镜分析技术（SEM）对室内PM2.5颗粒物样品进行了形貌观察和分析。实验在同一房间进行,以每天只采集一个PM2.5样品的方式,分别采集了室内不同体积空气中的PM2.5。实验表明：随着抽气体积的增加,可吸入肺颗粒物PM2.5样品的斑点颜色逐渐加深;对于抽气体积在3 m3以上的室内颗粒物样品,肉眼已无法分辨,但SEM可以显著分辨;SEM的分析结果表明,成都市城东龙潭工业园室内可吸入肺颗粒物PM2.5由形貌各异、大小不等的固态颗粒组成,颗粒物轮廓清楚、表面特征明显,粒径在0.01~3μm之间;长时间沉积PM2.5实验显示,室内PM2.5中存在大量不规则片状颗粒物,粒径在1~3μm之间。通过室内可吸入肺颗粒物PM2.5采集实验与SEM观察,可再根据元素分析技术进一步分析室内PM2.5,从而找出室内PM2.5污染物的来源,为制定相应的污染防治措施提供科学依据。

The collection experiments and morphology analysis on indoor PM2.5 samples were respectively carried out by an self- designed Airborne Particulate Matter Collected Platform and scanning electronic microscopy （SEM）. The PM2.5 air samples with different volumes were collected once per day in the same room. It was shown that the spot color of PMz5 samples was deepened with the increasing volume of air samples. PM2.5 samples in the air volume larger than 3 m3 could not be distinguished by the naked eyes but clearly visible under the scope of SEM. SEM images showed that the indoor PM2.5 samples in Longtan Industrial Park, East of Chengdu were constituted by solid particles with different morphologies and dimensions between 0.01 μm and 3 μm, which possessed clear profile and surface characteristics. Plentiful irregular flake - shaped particles were observed in the indoor PMz 5 with particle sizes between 1 μm an 3 μm for the long - term deposition experiments. Collection experiments and SEM observation for the indoor PM2.5 samples followed by elemental analysis is significant for identifying the pollution source of indoor PM2.5, and provides a scientific basis for the development of appropriate measures for pollution prevention.