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KMID : 1156220080340040300
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Journal of Environmental Health Sciences
2008 Volume.34 No. 4 p.300 ~ p.310
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Mass Concentration and Ion Composition of Size-segregated Particulate Matter during the Non-Asian Dust Storm of Spring 2007 in Iksan
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Kang Gong-Unn
Kim Nam-Song
Lee Hyun-Ju
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Abstract
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In order to further determine the mass concentration and ion composition of size-segregated particulate matter (PM) during the non-Asian dust storm of spring, PM25 (fine particle), PM10-25 (coarse particle), and PMover-10 (PM with an aero-dynamic diameter larger than 10 ㎛) were collected using a MCI (multi-nozzle cascade impactor) sampler of a three-stage filter pack in the spring season of 2007 in the Iksan area. During the sampling period from 5 April to 21 April, a total of 34 samples for size-segregated PM were collected, and then measured for PM mass concentrations by gravimetric measurements and for water-soluble inorganic ion species by using ion chromatography. Average mass concentrations of PM25, PM10-25, PMover-10 were 35.4±11.5 ug/㎥, 13.3±5.5 ㎍/㎥, and 9.5±4.7 ㎍/㎥, respectively. On average, PM25 accounted for 74% of PM10. Compared with the literature from other areas in Korea, the measured concentration of PM25 were relatively high. Water-soluble inorganic ion fractions in PM25, PMover-10, and PMover-10 were found to be 47.8%, 28.5%, and 14.7%, respectively. Among the water-soluble inorganic ion species, SO₄²?, NO₃?, and NH₄? were the main components in PM25, while NO₃? dominantly existed in both PMover-10 and PMover-10ㆍNon-seasalt SO₄²? (nss-SO₄²?) and NO₃?were found to mainly exist as the neutralized chemical components of (NH₄)₂SO₄and NH₄NO₃ in fine particles.
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KEYWORD
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PM25, 10-25, PMover-10, size-segregated particulate matter, MCI sampler, water-soluble inorganic ionspecies
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