2008 Volume 43 Issue 5 Pages 301-306
Atmospheric measurements of PM2.5 concentration were made in summer moist condition by using β-ray absorption techniqueand FRM-LV standard method attached with PTFE/ non-woven fabric filter (TFH filters: TFH-01 and TFH-47). In the measurements of PM2.5 by using two β-ray absorption methods attached with TFH-01, we had good results for concentrations less than 50μg/m3 that a slope of linear regression (S. L) was 1.0, a correction coefficient (R) was 0.986 (n=1448), and a standard error of regression (SE) was 1.756. For parallel measurements of PM2.5 less than 50μg/ m3 concentration by FRM-LV standard method attached with TK15-G3M filter and β-ray absorption method with TFH-01, S. L and R were 1.0 and 0.992 (n=15), respectively. We thus found that TFH-01 is suitable filter evenin summer moist condition in the measurement of PM2.5 by p-my absorption technique.
Parallel measurements of atmospheric concentration of PM2.5 were made in summer moist condition by using FRM-LV standardsamplers attached with TFH-47, TK15-G3M, TX-40 and 2500QAT filters. In the concentrations less than 50μg/m3, for the measured values attached with TFH-47, SL and R of those with TK15-G3M were 1.0 and 0.996 (n=15), respectively. Whereas, S. L and R of those with TX-40 were 1.0 and 0.998 (n=15), respectively, and with 2500QAT were 1.0 and 0.989 (n=15), respectively. Therefore, TFH-47 has similar good quality with TK15-G3M, TX-40 and 2500QAT in the measurements of PM2.5 by FRM-LV standard method.
From the results, TFH are high quality filters for the measurements of PM2.5 by β-ray absorption technique and FRM-LV standard method.
