Particle size distribution and anion content at a traffic site in Sha-Lu, Taiwan.
Ambient air particle concentrations were sampled by two total suspended particle (TSP) samplers, PM10/PM2.5 specific sampler and micro-orifice uniform deposit impactor (MOUDI) during July-October 2000 at a traffic sampling site in central Taiwan. The average TSP concentration (194 microg/m3) was about a factor of two higher than that of the fraction <2.5 microm (93.2 microg/m3). The mean level of the fraction <10 microm collected by MOUDI (93.2 microg/m3) was about 1 1/2 times higher than that of the size class <2.5 microm (43.8 microg/m3). Furthermore, this fraction showed a certain correlation with the TSP concentration. The particle size distribution was bimodal in the ambient air at the traffic site. The major peaks appear at particle diameters between 0.56-1.0 and 3.2-5.6 microm. The percentages of anions contained in TSP were 0.24% F-, 13.7% Cl, 0.52% Br, 12.0% NO-, 18.9% NO2-, and 54.6% SO2-. The Cl-, NO2-, and NO3- size distributions were all unimodal and the major peaks appeared at 3.2-5.6 microm. The SO2 size distribution was bimodal, with major peaks at 0.32-0.56 and 3.2-5.6.
Chang
K F
KF
Department of Environmental Engineering, National Chung Hsing University, Taichung, Taiwan, ROC.
Fang
G C
GC
Lu
C S
CS
Bai
H L
HL
D000393:Air Pollutants / Q000032:analysis*; D000838:Anions; D002947:Cities; D004784:Environmental Monitoring; D010316:Particle Size; D013624:Taiwan; D001335:Vehicle Emissions / Q000032:analysis*
D000393:Air Pollutants; D000838:Anions; D001335:Vehicle Emissions