• Journal of the Speleological Society of Korea
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• v.33 no.34
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• pp.7-22
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• 1993

본 연구에서는 단양지역에 분포한 석회암동굴계의 수질에 대한 주요 원소와 미량 원소 그리고 오염실태를 살펴보았다. 풍화물에 존재하는 미량 원소가 기반암보다 수 배 내지 수 백배 이상 부하되어 있었다. TSD와 EC 등은 화강암의 지하수 보다 높은 경향이 있었고 pH는 중성 내지 알칼리성이었다. Ca와 Mg은 기반암에서 용탈되어 지하수로 용존된 것으로 50ppm이상을 함유하고 있다. Fe과 K은 다른 주요 원소보다 현저히 낮은 경향이 있었다. 주요 음이온인 F$^{-}$ , Cl$^{-}$ , NO$_3$$^{-}$ , SO$_4$$^{-}$ 등은 환경기준치 보다도 현저히 낮은 상태이며, 따라서 오염이 안된 상태로 볼 수 있다. 미량 원소중 Al, Sr, Ba등이 높은 반면에 Co, Mo, Sb, Cs, W, Pb, U, Mn 등은 매우 극소량으로 존재하는 것으로 나타났다. 연구지역 중 온달굴, 고수굴, 천동, 노동 등지는 오염이 거의 안된 상태로 매우 양호한 편이나 천동굴은 관광객으로 인하여 일부 원소가 오염되어 있는 실정이다.

• Economic and Environmental Geology
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• v.40 no.5
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• pp.699-703
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• 2007

Compound-specific isotope analysis (CSIA) by isotope ratio mass spectrometer (IRMS) interfaced with gas chromatography (GC) is a state of the art analytical technique for stable isotopes in earth sciences, environmental sciences and forensics. Since early 1990s, GC-IRMS has been widely used to investigate the authenticity of food in forensic science and to trace the sources of organic contaminants in environmental science. In Korea, a GC-IRMS was firstly installed at the Korea Basic Science Institute (KBSI) in early 2005. In this study, we introduce the GC-IRMS of the KBSI shortly to stimulate various isotope-related researches of Korea, and report preliminary CSIA results for BTEX of different manufacturers.

• Analytical Science and Technology
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• v.11 no.4
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• pp.271-280
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• 1998

Rice flour reference materials were prepared from the unpolished rice grown in Korea and certified for elemental composition. The reference materials consist of two samples containing normal and high level. The reference material at elevated level was prepared by spiking to the normal rice flour six toxic elements of As, Cd, Cu, Cr, Hg, Pb with $1.0{\mu}g/g$ on a dry weight basis. Homogeneity of the prepared materials was evaluated through the determination of Ca, Cu, Fe, Mn, Zn by instrumental neutron activation analysis (INAA) and atomic absorption spectrometry (AAS). Small variance of elemental composition among interbottled samples assured homogeneity of the prepared materials. The materials were decomposed by high pressure digestion and microwave digestion method. INAA, AAS, inductively coupled plasma-atomic absorption spectrometry (ICP-AES), ICP-mass spectrometry (MS) and vapour generation techniques were employed to analyze the reference materials. From this independent analytical results, the certified or reference values are determined for As, Ca, Cd, Cr, Cu, Fe, Hg, K, Mg, Mn, Mo, Na, P, Pb, Se, Zn.

• The Journal of the Petrological Society of Korea
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• v.10 no.3
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• pp.222-232
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• 2001

Secondary ion mass spectrometry (SIMS) uses focused high-speed primary ions to produce secondary ions from sample surface that are analyzed through a mass filter. SIMS is often called as ion microprobe, since it offers a micrometer-scale spatial resolution. Although the precision and accuracy of SIMS are not as good as many conventional mass spectrometers, it has several advantages such as small sample-size requirement, high spatial resolution and capability of in-situ analysis. In the field of geochemistry/cosmochemistry, SIMS is widely used for (1) stable isotope geochemistry of H, C, O, S, etc., (2) geochronology of U/Th-bearing minerals, (3) lateral distribution of trace elements in a mineral, and (4) discovery of presolar grains and investigation of their isotopic compositions.

• Korean Journal of Ecology and Environment
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• v.46 no.4
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• pp.471-487
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• 2013

This review paper was written to provide background information as well as future application for aquatic ecologists interested in using stable isotope. Stable isotope techniques has proved to be an extremely useful to elucidate a lot of environmental and ecological problems. Stable isotopes have been used as possible tracers to identify sources, to quantify relative inputs in a system. When utilized carefully, stable isotope tools provides apparent advantages for the scientists to find out the processes of material cycles in various environments and energy flows in natural ecosystems.

• The Journal of the Petrological Society of Korea
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• v.13 no.4
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• pp.238-243
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• 2004

Duwon meteorite was fallen on 23 November 1943 in Duwonmyeon, Goheung, Jeolanam-Do. We measured rare earth element abundance of Duwon meteorite by isotope dilution thermal ion mass spectrometry (ID-TIMS) and ICP-MS. As a result, except La and Ce, abundance of other rare earth element show a correspondence within 10％ of error range. However, La and Ce show more than 70％ in abundance, which is considered due to 1) experimental procedure or 2) inhomogeneity of sample. Leedey meteorite was fallen on 25 November 1943 in Dewey County, Oklahoma, USA. which suggested that fallen difference between Leedey and Duwon meteorites is only 2 days. Leedey and Duwon meteorites are classified as ordinary chondrite of L6 type. In Leedey chondrite-normalized REE pattern, Duwon meteorite shows nearly flattened, which suggests close relationship between Leedey and Duwon meteorites meteoritically or cosmochemically.

• Analytical Science and Technology
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• v.15 no.6
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• pp.509-513
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• 2002

In this study, instrumental neutron activation analysis was used to assess the concentration level of inorganic trace elements in Korean women blood serum. It was found out that high concentration of Na and Cl incurs analytical interference, but 12 elements of Br, Ca, Cl, Co, Cr, Cs, Fe, K, Na, Rb, Se, Zn can be determined under the condition of interference minimization. Serum samples collected from 63 women were analyzed and the concentration level and range of the elements were evaluated. NIST SRMs were analyzed simultaneously for analytical quality control. The average values of Na and Cl determined in serum samples are around 3000 mg/L, Ca is 100 mg/L and K is 200 mg/L. Besides, Br, Se and Zn have concentration level of 6.0, 0.1 and 1.0 mg/L, respectively. It was found that there is no significant difference between the present values and reported values.

• Analytical Science and Technology
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• v.22 no.5
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• pp.422-431
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• 2009

The analytical results of wear metals such as Na, Mg, Al, Si, P, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Mo, Ag, Cd, Sn, Ba, Pb in oil samples are compared by portable and bench-top XRF methods as a basic study for the development of portable X-ray fluorescence spectrometer. The instrumental parameters such as measurement time of portable and bench-top XRF were optimized using certified reference materials of hydrocarbon oil with 20 wear metals in concentration range from 10 to 900 mg/kg. The analytical results of 20 wear metals in certified reference materials and new/used engine oil samples were compared by empirical and fundamental parameter methods.

• Analytical Science and Technology
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• v.23 no.5
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• pp.498-504
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• 2010

It is very difficult to get stable ion peak intensity of ruthenium by thermal ionization mass spectrometry because of its high ionization potential and high volatility of its oxides which causes to lose much of ruthenium ions, so the intensity of the signal decrease quickly. Accordingly, a study was performed in oder to increase the ionization efficiency and to prevent sample losses due to volatilization and to check with isobaric effect by impurities in filament for the measurement of ruthenium isotopes. Both single filament and double filament were tested. The former was proved to be more efficient for the stable and strong intensity of signal and revealed less isobaric effect from the molybdenum (Mo) as a filament impurity. Also, when the temperature of filament increased too high, the isobaric effect from Mo greatly appeared. That is, Mo impurity from filament gave a serious effect for measuring the ruthenium isotopes. It was proved to be of importance that filament current should be slowly increased with time interval. Finally, ruthenium isotopes were accurately measured by correction with measuring $^{94}Mo/^{99}Ru$.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.282-282
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• 2015

전자분광 화학분석(Electron Spectroscopy for Chemical Analysis : ESCA)은 고체표면의 구성원소 및 원소간 화학 결합 상태를 분석할 수 있는 효율적인 방법이다. ESCA 분석은 재료의 극표면층 (약 $20{\sim}100{\AA}$)에 분포되어 있는 원소 및 화학상태를 정성 정량적으로 확인할 수 있다. 또한, $Ar^+$이온을 충돌시켜 재료 표면을 ㎚단위로 식각 할 수 있기 때문에 수직분포 분석(Depth profiling)이 가능하여 나노재료가 활용되는 촉매, 반도체소자 그리고 박막 재료 등의 분석에 유용하게 활용될 수 있다. 이와 같은 분석적 장점에도 불구하고, ESCA 분석은 표면특성 분석에 주로 활용되는 주사전자현미경 및 X-선 미소분석(EDS, WDS) 등에 비하여 폭 넓게 사용되고 있지 못하다.