TY - JOUR
T1 - Differences in 24-h average PM2.5 concentrations between the beta attenuation monitor (BAM) and the dichotomous sampler (Dichot)
AU - Liu, Chun Nan
AU - Awasthi, Amit
AU - Hung, Yi Hung
AU - Gugamsetty, Balakrishnaiah
AU - Tsai, Chuen-Tinn
AU - Wu, Yueh Chuen
AU - Chen, Chung Fang
PY - 2013/8
Y1 - 2013/8
N2 - In this study, PM2.5 concentrations 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,B concentrations measured by the VEREWA-F701 BAM (without federal equivalent method (FEM) designation) are consistently higher than PM2.5,D concentrations 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.
AB - In this study, PM2.5 concentrations 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,B concentrations measured by the VEREWA-F701 BAM (without federal equivalent method (FEM) designation) are consistently higher than PM2.5,D concentrations 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.
KW - Beta attenuation monitor
KW - Dichotomous sampler
KW - Glass fiber filter
KW - PM sampling artifacts
UR - http://www.scopus.com/inward/record.url?scp=84878159983&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2013.04.062
DO - 10.1016/j.atmosenv.2013.04.062
M3 - Article
AN - SCOPUS:84878159983
SN - 1352-2310
VL - 75
SP - 341
EP - 347
JO - Atmospheric Environment
JF - Atmospheric Environment
ER -