Transmission measurements have been performed on University Research Glassware, Inc. model 2000–30B glass annular denuders at 10 L/min using monodisperse particles in the 0.01–1-μm diameter size range. Through control of the aerosol charge state, particle losses due to diffusion and electrostatic effects were separately measured and theoretical descriptions of both were developed. For Boltzmann charged (atmospheric) particles in the important 0.1–1-μm diameter size range total losses averaged only a few percent or less. Particle transmission measurements also confirmed the design value of 2.5 μm for the 50% cutpoint diameter of the URG 2000-30EN cyclone inlet used with these annular denuders.
Bibliographical noteFunding Information:
This work was supported by the U.S. Environmental Protection Agency under Purchase Order No. 9D1763YASA. It has been subjected to Agency review and approved for publication. Mention of commercial products does not constitute endorsement by US EPA.