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KMID : 1156220060320040359
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Journal of Environmental Health Sciences
2006 Volume.32 No. 4 p.359 ~ p.372
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Deposition Characteristics of Water-soluble Inorganic Ions in the Iksan Ambient Air during Fall, 2004
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Kang Gong-Unn
Jeon Seon-Bok
Kim Nam-Song
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Abstract
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In order to investigate the daily deposition characteristics of water-soluble inorganic components in airborne deposit in the Iksan, deposition samples were collected using a deposition gauge from October 16 to November 1, 2004. Deposition samples were collected using two different sampling gauges, a dry gauge and a wet gauge, respectively. To get wet the bottom of wet gauge during the sampling period, the volume of 30~50 ㎖ distilled ionized water was added in a wet gauge before the beginning of each deposition sampling. Deposition samples were collected twice a day and analyzed for inorganic water-soluble anions (Cl?, NO₃?, SO₄2-) and cations (NH₄?, Na?, K?, Mg2+, Ca2+) using ion chromatography. Quality control and quality assurance of analytical data were checked by the data obtained from reinjection of standard solution, Dionex cross check standard solutions, and random several deposition samples, and measured data was estimated to be reliable. Considering the deposition sample volume, the sampling time, the surface area of sampling container, and the ion concentration measured, the daily deposition amounts for measured ions were calculated in ㎎/㎡. The total daily deposition amounts of all measured ions for dry and wet gauge were 7.5±2.8 and 17.7±4.2 ㎎/㎡, respectively. A significant increase in deposition amount during rainfall days was observed for both wet gauge and dry gauge, having no difference of deposition amount between in wet gauge and in dry gauge. The mean deposition of all ions measured in this study were higher in wet gauge than in dry gauge because of the surface difference of the sampling container, especially for NH₄? and SO₄2?. The mean deposition amounts of NH₄? and SO₄2? in wet gauge were found to be about 10 times and 3 times higher than those in dry gauge, while the rest of the chemical species were equal or a little higher in wet gauge than in dry gauge. Dominant species in dry gauge were NO₃? and Ca2+, accounting for 21% and 28% of the total ion deposition, whereas those in wet gauge were SO₄2? and NH₄?, accounting for 19% and 41% of the total ion deposition, respectively.
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KEYWORD
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deposition amount, water-soluble inorganic ions, wet gauge, dry gauge, quality control and quality assurance
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