Abstract
Inlet dimensions of the 10-mm nylon cyclone are such that at a 2-liter/min sampling rate particles of 1- to 10-μm aerodynamic equivalent diameter (AED) may not be representatively sampled. Samples of a coal dust aerosol were collected simultaneously with two filter holders: one designed to sample representatively 1- to 10-μm AED particles at 2 liters/min in calm conditions, and one with smaller inlet dimentions corresponding to those of the 10-mm nylon cyclone. No differences in mass concentration or size distribution were observed. Standard 10-mm nylon cyclones were modified to conform to theory by installing entries of plexiglas and aluminum. A coal dust aerosol with 3.3-μm geometric mean AED was simultaneously sampled with modified and unmodified cyclones. Differences in the mass concentration of respirable dust collected were observed with the plastic entries and were attributed to pairticle deposition within the entry caused by static charge. No differences were observed with the aluminum entry.