Abstract
Within the Swedish Urban Air Projects two methods have been used for sampling of airborne particulate matter for biological testing: high volume sampler (HVS) and an electrostatic precipitator (ESP). The HVS was commercially available while two ESPs had to be constructed. The ESP samplers use impactors for collection of large particles and Teflon-coated collection electrodes for collection of fine particles. The ESP sampler used only one impaction stage, designed for a 15-μm cut-off. Its flow rate was about 4000 m 3/h. The ESP sampler was prepared for the use of adsorbents for gas phase sampling, but this sampling has not been carried out. The collection efficiency of the ESP was normally better than 90% for particles less than 15 μm. Thirteen reference samples, containing several grams of particles, have been collected in different environments such as non-urban, urban-roof, urban-street, and traffic-tunnel environments representing both summer and winter conditions. Several 1-h samples were also collected.
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