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Low-Z Electron Probe X-ray Microanalysis 분석법을 이용한 해안 인근 지역의 대기입자 분석
김혜경,노철언 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.5
A single particle analytical technique, called low-Z, electron probe X-ray microanalysis(low-Z EPMA) was applied to characterize atmospheric particles collected in Busan, Korea, over in daytime period in Dec. 2001. The ability to quantitatively analyze the low-Z elements, such as C, N, and O, in microscopic volume enables the low-Z EPMA to specify the chemical composition of individual atmospheric particle, Various types of atmospheric particles such as organics, carbon-rich, aluminosilicates, silicon oxide, calcium carbonate, iron oxide, sodium chloride, sodium nitrate, ammonium sulfate, and titanium oxide were identified. In the sample collected in Busan, sodium nitrate particles produced as a result of the reaction between sea salt and nitrogen oxides in the atmosphere were most abundantly encountered both in the coarse and fine fractions. On the contrary, original sea salt particles were rarely observed. The fact that most of the carbonaceous particles were distributed in the fine fraction implies that their origin is anthropogenic.
Low-Z Particle Electron Probe X-ray Microanalysis를 이용한 2001년 서울시 대기 중 입자상 물질 분석
구희준,김혜경,노철언 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.6
Atmospheric aerosol particles collected in Seoul on four single days, each in every seasons of 2001, were characterized and classified on the basis of their chemical species using low-Z particle electron probe X-ray microanalysis (low-Z particle EPMA) Low-Z particle EPMA technique can analysis both the size and the chemical species of individual aerosol particles of micrometer size and provide detailed information on the size distribution of each chemical species The major chemical species observed in Seoul aerosol were aluminosilicate, silicon dioxide, calcium carbonate, organic, carbon-rich, marine originated, and ammonium sulfate particles, etc The soil originated species, such as alummosilicate, silicon dioxide, and calcium carbonate were the most popular in the coarse fraction, meanwhile, carbonaccous and ammonium sulfate were the dominant species found in the fine traction Marine originated species such as sodium nitrate was frequently encountered, up to 30% or the analyzed aerosol particles
안용훈,김혜경,노철언 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.6
Low-Z particle electron probe X-ray microanalysis (low-Z particle EPMA) was applied to characterize aerosol particles collected at Gosan in Jeju island during an IOP(intensive observation period) for an international ACE-Asia project In April, 2001. Various types of atmospheric particles such as organics, carbon-rich, aluminosilicates, silicon oxide, sodium nitrate, sodium chloride, and ammonium sulfate were observed The reacted sea salt particles such as sodium nitrate were the most abundantly encountered, but original sea salt particles were rarely observed Since the Low-Z particle EPMA can provide quantitative information on the chemical composition of aerosol particles many different particle types on the basis of their chemical compositions were observed and identified In this study, It is demonstrated that the Low-Z particle EPMA can provide detailed information on the chemical compositions for the aerosol particles collected for six consecutive days in April, 2001, at Gosan super-site
단일입자분석(Low-Z Electron Probe X-ray Microanalysis)을 이용한 2000년, 2001년에 발생한 황사 입자의 특성분석
황회진,김혜경,노철언 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.4
A single particle analysis, called low Z electron probe X-my microanalysis was applied to characterize the atmospheric aerosols collected during Asian Dust storm events in the year of 2000 and 2001. Most frequently encountered chemical species were the soil-originated species such as aluminosilicates, silicon dioxide, md calcium carbonate. Also various species such as carbon-rich, organics, sea salts. and some reacted calcium carbonate were identified. The observation of internally mixed particles of calcium carbonate, calcium nitrate and/or calcium sulfate shows the occurrence of the heterogeneous reaction between Asian Dust panicles and NOx and/or SOx, species in the atmosphere.
RO, CHUL-UN,OH, KEUN-YOUNG,KIM HYEKYEONG,KIM, YONG-PYO,LEE, CHONG-BUM,KIM, KI-HYUN,KANG, CHANG-HEE,J?NOS OS?N,JOHAN DE HOOG,ANNA WOROBIEC,REN? VAN GRIEKEN 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-
A recently developed electron probe X-ray microanalysis(EPMA), called low-Z EPMA, employing an ultrathin window energy-dispersive X-ray detector, was applied to characterize aerosol particles collected at two sampling sites, namely, Kosan and 1100 Hill of Cheju Island, Korea, on a summer day in 1999. Since low-Z EPMA can provide quantitative information on the chemical composition of aerosol particles, the collected aerosol particles were classified and analyzed based on their chemical species, Many different particle types were identified, such as marine-originated, carbonaceous, soil-derived, and anthropogenic particles. Marine-originated particles, such as NaNO_(3-) and Na₂SO_(4-)containing particles, are very frequently encountered in the two samples. In this study, it was directly proven that the observed nitrate particles were from sea salts. In addition, two types of nitrate particles from sea salts were observed, with and without Mg. The sodium nitrate particles without Mg were believed to be collected as crystalline form, either with the sodium nitrate particles being fractionally recrystallized within evaporating seawater drops or with recrystallized sodium chloride particles having reacted with gaseous nitrogen species in the air to form the crystalline sodium nitrate particles. The other seemed to be collected as seawater drops, where the atmospheric reaction had occurred in the droplets, and thus sodium as well as magnesium nitrates were observed. Carbonaceous particles are the most abundant in the samples at both sites. From this study, it was found that about three-quarters of the carbonaceous particles in the samples were biogenic, which partially explains a previously reported observation of a large concentration of organic carbon particles as compared to elemental carbon. Various soil-derived particles were also observed. In addition to aluminosilicate- and iron oxide-containing particles, which are ubiquitous components in soil-derived particles, CaCO_(3-) and Cr-containing particles were also frequently encountered.
Ro, Chul-Un 한국분석과학회 1995 분석과학 Vol.8 No.4
Two types of regularization method (singular system and HMP approaches) for generating depth-concentration profiles from angle-resolved XPS data were evaluated. Both approaches showed qualitatively similar results although they employed different numerical algorithms. The application of the regularization method to simulated data demonstrates its excellent utility for the complex depth profile system. It includes the stable restoration of the depth-concentration profiles from the data with considerable random error and the self choice of smoothing parameter that is imperative for the successful application of the regularization method. The self choice of smoothing parameter is based on generalized cross-validation method which lets the data themselves choose the optimal value of the parameter.