TY - JOUR
T1 - Analysis of the measurement difference for the PM 10 concentrations between beta-ray absorption and gravimetric methods at gosan
AU - Shin, So Eun
AU - Jung, Chang Hoon
AU - Kim, Yong Pyo
PY - 2011/12
Y1 - 2011/12
N2 - The measured mass concentrations of particulate matter less than 10 μm in diameter (PM 10) by β-ray absorption method (BAM) and gravimetric method (GMM) at Gosan, Republic of Korea have shown consistent difference. By using a gas/particle equilibrium model, positive error by the absorption of water at the filter in BAM during the measurements were quantified. The positive error occupied about 50% of the measurement difference. The contributions from the volatilization of ionic species to the difference were minor. However, this estimated water content difference could fully explain the concentration difference by the two methods. Multiple regression analysis was applied to the PM 10 mass concentration to find out the major factors that affected the concentration difference. Relative humidity, dust storm event and wind direction were identified as other major factors in addition to water absorption i.e., positive error. Still these factors could not fully account for the difference. Thus, it is advised that when using the PM 10 concentration at Gosan, a supersite in Northeast Asia, possible difference should be considered for the data till June 2008 by BAM.
AB - The measured mass concentrations of particulate matter less than 10 μm in diameter (PM 10) by β-ray absorption method (BAM) and gravimetric method (GMM) at Gosan, Republic of Korea have shown consistent difference. By using a gas/particle equilibrium model, positive error by the absorption of water at the filter in BAM during the measurements were quantified. The positive error occupied about 50% of the measurement difference. The contributions from the volatilization of ionic species to the difference were minor. However, this estimated water content difference could fully explain the concentration difference by the two methods. Multiple regression analysis was applied to the PM 10 mass concentration to find out the major factors that affected the concentration difference. Relative humidity, dust storm event and wind direction were identified as other major factors in addition to water absorption i.e., positive error. Still these factors could not fully account for the difference. Thus, it is advised that when using the PM 10 concentration at Gosan, a supersite in Northeast Asia, possible difference should be considered for the data till June 2008 by BAM.
KW - Gas-particle equilibrium
KW - Gravimetric method
KW - Multiple regression analysis
KW - Water content
KW - β-ray absorption method
UR - http://www.scopus.com/inward/record.url?scp=84863140071&partnerID=8YFLogxK
U2 - 10.4209/aaqr.2011.04.0041
DO - 10.4209/aaqr.2011.04.0041
M3 - Article
AN - SCOPUS:84863140071
SN - 1680-8584
VL - 11
SP - 846
EP - 853
JO - Aerosol and Air Quality Research
JF - Aerosol and Air Quality Research
IS - 7
ER -