Published by Taylor and Francis 0278-6826=01=$12.00 C.00 A Particle-into-Liquid Collector for Rapid Measurement of Aerosol Bulk Chemical Composition

We report on a new instrument developed for rapid automated on-line and continuous measurement of ambient aerosol bulk com-position.The general approach is basedon earlier devices (Khlystov et al. 1995; Simon and Dasgupta 1995) in which ambient particles are mixed with saturated water vapor to produce droplets easily collected by inertial techniques. The resulting liquid stream is an-alyzed with an ion chromatograph to quantitatively measure the bulk aerosol ionic components. In this instrument, a modi ed ver-sion of a particle size magni er (Okuyama et al. 1984) is employed to activate and grow particles comprising the ne aerosol mass. A single jet inertial impactor is used to collect the droplets onto a ver-tical glass plate that is continually washed with a constant water diluent ow of nominally 0.10 ml min ¡ 1. The ow is divided and then analyzed by a dual channel ion chromatograph. In its current form, 4.3 min integrated samples were measured every 7 min. Th