Combined inertial and pleated filter for efficient PM1.0 separation and sampling

초록

A reliable measuring method of particulate matter less than 1 mu m (PM1.0) is essential to clarify the correlation between the PM 1.0 mass concentration and the impact of human health, and to establish effective PM 1.0 control strategies. In this study, a new PM 1.0 sampler, the inertial filter/pleated filter sampler (I/P sampler), was designed to collect particles larger than 1 mu m in the inertial filter and PM 1.0 in the pleated filter during sampling. The inertial filter with small filtration area successfully separated particles larger than 1 mu m by reducing diffusion and increasing inertia, while the pleated filter with large filtration area efficiently collected PM 1.0 by lowering the filtration velocity to promote diffusional collection. The I/P sampler was used to measure PM 1.0 mass concentration through field tests, with results compared with those of conventional sampling devices for PM 1.0 (cyclone sampler, cascade impactor, beta attenuation monitor [BAM], and EPA-approved federal reference method [E-FRM] sampler). Field measurements indicated a good correlation between the I/P sampler and conventional samplers, with regression slopes ranging from 0.90 to 1.07 in summer and 1.10 to 1.37 in winter. In addition, the measured mass concentrations decreased in the order of I/ P sampler, cyclone sampler, E-FRM sampler, BAM, and cascade impactor.

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