Ambient Nanoparticles Characterization by East Asia Nanoparticle Monitoring Network (EA-NANONET)

摘要

In 2010, an ambient air sampler consisting of a four-stage impactor and an inertial filter, for collecting various size fractions, including nano-particles, in a short sampling period has been developed. The sampler (here in after referred to as a “PM0.1 ambient sampler”) has impactor stages of PM10, PM2.5, PM1 and PM0.5 successfully devised with a reasonable accuracy in terms of cutoff size and slope of the collection efficiency curves. The designed inertial filter had an aerodynamic cutoff size dp50 of 100 nm with a satisfactory sharpness in classification. The total pressure drop of the sampler was ～25kPa at a flow rate of 40 L/min. The developed sampler has advantages over currently available samplers such as LPI and nano-MOUDI, in terms of portability and loss of semi-volatile components in ultrafine particles by evaporation at a reduced pressure.