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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 7
BKCSDE 30(7)
July 20, 2009

Title	Development of Semicontinuous Measurement System of Ionic Species in PM_2.5
Author	Sang Bum Hong*, Wonil Chang, Chang Hee Kang, Jai H Lee
Keywords	PM_2.5, Particle collection section, Semicontinuous measurement system
Abstract	A new method to semicontinuously determine PM_2.5 ionic species with a short time resolution is described in detail. In this system, a particle collection section (mixing part, particle collection chamber, and air/liquid separator) was developed. A Y-type connector was used to mix steam and an air sample. The particle collection chamber was constructed in the form of a helix coil and was cooled by a water circulation system. Particle size growth occurred due to the high relative humidity and water absorbed particles were efficiently collected in it. Liquid samples were drained out with a short residence time (0.08-0.1 s). The air/liquid separator was also newly designed to operate efficiently when the flow rate of the air sample was 16.7 L min^-1. For better performance, the system was optimized for particle collection efficiency with various types of test aerosols such as (NH₄)₂SO₄, NaCl, NH₄HSO₄, and NH₄NO₃. The particle collection efficiencies were almost 100% at different concentration levels in the range over 500 nm in diameter but 50-90% in the range of 50-500 nm under the following experimental conditions: 15 coil turns, a water flow rate for steam generation of 0.65 mL min^-1, and an air sample flow rate of 16.7 L min^-1. Finally, for atmospheric applications, chemical compositions of PM2.5 were determined with a time resolution of 20 min on January 11-24, 2006 in Seoul, Korea, and the chemical characteristics of PM2.5 ions were investigated.
Page	1505 - 1515
Full Text	PDF

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