Differences in 24-h average PM2.5 concentrations between the beta attenuation monitor (BAM) and the dichotomous sampler (Dichot)
Differences in 24-h average PM2.5 concentrations between the beta attenuation monitor (BAM) and the dichotomous sampler (Dichot)
复制标题
β 衰减监测器 (BAM) 和二分采样器 (Dichot) 24 小时平均 PM2.5 浓度的差异
DOI：
10.1016/j.atmosenv.2013.04.062
复制
发表时间：
2013
影响因子：
5
通讯作者：
Chung
中科院分区：
文献类型：
--
作者：
Chun;A. Awasthi;Yi;Balakrishnaiah Gugamsetty;Chuen;Yueh;Chung
在该研究中，通过二分采样器（Dichotomous sampler）（Dichot，Model SA 241，Andersen Inc.，格鲁吉亚，美国）（PM2.5，D）和β衰减监测器（BAM）（PM2.5，B）在台湾的三个空气监测站。结果表明，VEREWA-F701 BAM测量的PM2.5，B浓度（没有联邦等效方法（FEM）的指定）的PM2.5，D浓度始终高于中山站的58.4 ± 37.4%，而新庄和居东站的高估程度较小，分别为29.8 ± 20.2%和28.4 ± 19.0%，其中使用Met-One BAM-1020的早期版本（无FEM名称）。BAM-1020的高估，其中包括气溶胶水含量，无机物的挥发和积极的文物，由于酸性气体吸附的玻璃纤维过滤带的影响因素进行了研究。结果表明，过高估计主要是由于BAM-1020中使用的玻璃纤维过滤带吸附酸性气体而产生的正伪影造成的。气溶胶含水量和无机半挥发性组分的挥发损失对高估的影响较小。
In this study, PM2.5concentrations were measured simultaneously by a Dichotomous sampler (Dichot, Model SA241, Andersen Inc., Georgia, USA) (PM2.5,D) and a beta attenuation monitor (BAM) (PM2.5,B) at each of three air monitoring stations in Taiwan. Results show that PM2.5,Bconcentrations measured by the VEREWA-F701 BAM (without federal equivalent method (FEM) designation) are consistently higher than PM2.5,Dconcentrations by 58.4 ± 37.4% at Jhongshan station, while less overestimation exists at Sinjhuang and Judong stations, which is 29.8 ± 20.2 and 28.4 ± 19.0%, respectively, where the earlier version of the Met-One BAM-1020s (without FEM designation) are used. Different factors influencing the overestimation, which include aerosol water content, volatilization of inorganic species and positive artifacts due to acid gas adsorption by the glass fiber filter tapes were studied for the BAM-1020. Results show that the overestimation is mainly caused by the positive artifacts due to acid gas adsorption by the glass fiber filter tapes used in the BAM-1020. Aerosol water content and volatilization loss of inorganic semi-volatile species are found to be less important to the overestimation.