호흡기 침착부위에 따른 미세먼지 중 수용성 이온성분의 일별 농도 측정

Daily Concentration Measurements of Water-soluble InorganicIons in the Atmospheric Fine Particulate for RespiratoryDeposition Region

In oder to understand the deposition possibility of water-soluble inorganic ions in the atmospheric fine particulatesfor the human respiratory tract, the mass size distribution of ion species was measured using an Andersen samplerin the Iksan during fall, 2004. Samples were analyzed for major water-soluble ions using Dionex DX-100 ion chromatograph.The size distribution of water-soluble inorganic ions in the atmospheric particulates appeared bimodaldistribution, which were divided around 1-2 μm into two groups. Mass size distribution of total ion in the coarsemode was found to be almost similar level during the sampling period, but fluctuations of mass size distribution inthe fine mode were observed. Considering the mass size distribution of total ion concentrations for the respiratorydeposition region, it was found that about 77.1% of total ions could be deposited in the alveolar region, and whichdominated the daily variation of total ion concentrations. The concentration of total ions, which could be depositedin both the head region and the tracheobronchial region, was 3.95 μg/m3, whereas that in the alveolar region was13.28 μg/m3. Dominant ions which could be deposited in the alveolar region were NO3., SO42. and NH4+, accountingfor about 40%, 27% and 22% of the total ions, respectively. Although K+ was approximately 3% of total ions, it wasshown that most of this could be deposited in the alveolar region due to its high fraction of small size distributionoriginated from anthropogenic source of biomass burning. The presence of these ions in the fine mode may be ofpublic health significance as they are very biologically harmful to health and have a high probability of being depositedin human lung tissue.