PM2.5 impactor is designed by using self-developed impactor-calculating software. Its particle separating performance influenced by nozzle sizes, flow-rate, and circumstance factors is also analyzed. The cut diameter of an aluminum impactor is 2.42 μm, and the mass of collected particles is with relative error of 8.1% to that expected for the 'ideal sampler'. The sampling system is of good gas tightness with pressure drop of less than 0.005 MPa within 1 min and good flow stability with cumulative flow deviation of less than ± 5%. The performance of the developed sampler meets the requirement of practical speciation sampling of ambient fine particles to be used for the measurement of mass, chemical species, and single particle characteristics simultaneously, which has been verified with laboratory test, parallel sampling comparison with a commercial sampler made in the USA, and field sampling in three typical cities in China.
|Journal||Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering|
|Publication status||Published - Dec 2006|