Abstract
Two condensation nucleus (CN) counters—an Environment/One Rich 100 (E/One) and a General Electric (GE)—were calibrated with submicron, monodisperse, hydrophilic and hydrophobic aerosols. The counters were factory-equipped with the plastic tubing used for the aerosol sampling system. High losses of charged aerosol particles occurred because large electrostatic charges built up on the inner and outer surfaces of the plastic tubing. Replacing these plastic tubes with metal tubes greatly improved the response of the CN counters. The response of the GE was independent of particle surface properties and exhibited only a slight size dependency for particles smaller than 0.03 μm in dia. For particles smaller than 0.07 μm, the E/One was not as responsive to hydrophobic as to hydrophilic particles. This difference in response became larger as particle size decreased.
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