A Study of Low Flow Rate Cascade Impactor and Evaluation of the Efficiency.

概要

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Low flow rate cascade impactors were developed to measure indoor airborne particulates simply. The airborne particulates were size fractionated by a 3 stage cascade impactor (larger than 10μm, 2.5-10μm and smaller than 2.5μm) . Flow rate was 3.0l/min or 25l/min. To examine the accuracy of this method, simultaneous measurement of particulate and polycyclic aromatic hydrocarbons (PAHs) concentrations were performed by using this cascade impactor and a TEOM particulate monitor which was the standard device for measuring particulate concentration.<BR>(1) Concentrations of indoor airborne particulates collected by this cascade impactor were almost same as those of the standard method using the TEOM in a tabacco-smoked room or less contaminated room.<BR>(2) PAH concentrations in indoor airborne particulates collected by the cascade impactor were also same as those of standard method using the TEOM. The order of size-fractionated PAH concentrations in indoor airborne particulates were as follows; larger than 10μm<2.5-10μm< smaller than 2.5μm.<BR>(3) Coefficient of variations (CV) of particulate concentration were below 8.8% if the mass of collected particulates were more than about 50μg. CV of PAHs concentration were also excellent. These results suggest that the low flow rate cascade Impactor developed in this study is a simple and useful method for measurement of fine airborne particulates.
日本環境化学会の論文