• 대한화학회지
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• 제22권6호
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• pp.357-364
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• 1978

Spherical harmonics의 전개방법에 의하여 쌍극자모멘트의 행렬요소를 계산하는 방법을 사용하여 $NH_3$, HF, CO, HCHO, HCN, PO, $PO^-\;및\;H_2O$분자의 쌍극자모멘트를 계산하였다. 이 방법에 의하여 계산한 쌍극자모멘트의 값이 다른 방법의 값보다 실험치에 가까웠다.

• 대한화학회지
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• 제23권3호
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• pp.136-140
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• 1979

이온교환법에 의하여 토륨과 희토류들을 분리해 내기에 알맞은 용액을 얻기 위하여 모나자이트를 황산으로 분해하였다. 황산분해는 모나자이트를 2.0시간동안 150∼$250^{\circ}C$온도에서 $95{\%}C$황산으로 분해시켰다. 황산과 모래의 무게비는 1:1.9∼2.8로 실험하였으며 95% 황산을 사용했을 때 $200{\pm}5^{\circ}C$ 온도에서 2.0시간 처리하는 것이 가장 좋은 결과를 얻었으며 분해율은 99%를 넘는 것으로 밝혀졌다.

• Bulletin of the Korean Chemical Society
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• 제31권9호
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• pp.2488-2492
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• 2010

A method is described for the determination of the Po nuclides in a water sample. After the Po nuclides were purified from interfering elements in a water sample using a manganese dioxide precipitation followed by a solvent extraction method, the Po nuclides were deposited onto the silver plate. A large volume of the water sample was effectively pretreated with manganese dioxide precipitation method. To determine the optimum conditions for plating Po, the effects of the pH, volume, temperature and time on the Po deposition were investigated in hydrochloric acid solution. The investigated determination method of Po nuclides with solvent extraction was applied to a tap water sample.

• The Plant Pathology Journal
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• 제34권2호
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• pp.85-92
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• 2018

Enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR), widely used for the detection of plant viruses, are not easily performed, resulting in a demand for an innovative and more efficient diagnostic method. This paper summarizes the characteristics and research trends of biosensors focusing on the physicochemical properties of both interface elements and bioconjugates. In particular, the topological and photophysical properties of quantum dots (QDs) are discussed, along with QD-based biosensors and their practical applications. The QD-based Fluorescence Resonance Energy Transfer (FRET) genosensor, most widely used in the biomolecule detection fields, and QD-based nanosensor for Rev-RRE interaction assay are presented as examples. In recent years, QD-based biosensors have emerged as a new class of sensor and are expected to open opportunities in plant virus detection, but as yet there have been very few practical applications (Table 3). In this article, the details of those cases and their significance for the future of plant virus detection will be discussed.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.397-400
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• 2003

In this study, humic and fulvic acids in soils at the vicinity of domestic atomic power plants(NPPs), located in Yungkwang(YK), Uljin(UJ), Kori(KR), Koseong(KS), Wolseong(WS) area, and in volcanic ash soils of the Cheju island(Mt. Hanla(HL), Manjanggul(MJ)) were isolated, and characterized using chemical(elemental analysis, proton exchange capacity, molecular size distribution) and spectroscopic(UV/Vis., IR, FL, $^{13}$ C NMR spectra) methods. The results were compared with one another and compiled for their DB establishments. The humic substances distribution (humic acid, fulvic acid, Humin) in the soils were also determined by IHSS standard method. Main purpose of this study was to provide a basic data needed to evaluate the effect of humic substances on the migrational behaviour of radioactive elements in contaminated surface soil.

• 한국광물학회지
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• 제12권2호
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• pp.77-90
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• 1999

Characteristics and variations of chemical compositions in Co-rich crusts occurred in the EEZ of the Republic of Marshall Islands were reviewed. Correlation coefficient analysis, hierarchical cluster analysis, and Q-mode factor analysis for 62 samples were done in this study. All data were selected and gathered from the open file report of the cooperative cruise done by United States Geological Survey with Scripps Institute of Oceanography, University of Hawaii or Korea Ocean Research Development Institute. The average of crust thickness. Co content, and Ni content of 62 samples from the 21 seamounts were 30mm, 0.58 wt% and 0.40%, respectively. The mineral phases and associated elements assigned by correlation coefficients, cluster analysis and Q-mode factor analysis are following four. 1) CFA: P, Ca, CO2, Y, Sr: 2) Mn-oxide mineral: As, Mn, Co, Na: 3) Al-silicate mineral: Pd,Si, Al, Cu, Fe: 4) PGE-bearing mineral: Rh, Pt, Ir.

• 한국대기환경학회지
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• 제16권6호
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• pp.565-572
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• 2000

To quantitatively estimate mass contribution of long-range transported yellow sand, their sources should be separated independently from various local soil sources having similar elemental compositions. While it is difficult to estimate total mass loadings of pure yellow sand by traditional bulk analysis, it can be clearly solved by an particle-by-particle analysis. To perform this study, two yellow sand samples and three local soil samples were collected by a mini-volume sampler. These samples were three analyzed using a scanning electron microscope(SEM) equipped with an energy dispersive x-ray analyser (EDX) was used to obtain basic chemical information of individual yellow san particles. A total of 19 elements in a single particle were measured to develop a source profile with newly created homogeneous particle classes (HPCs) as chemical variables. The present study showed that the yellow sand samples as well as three local soil samples were characterized with reasonably well created HPCs. Finally the mass fraction of each HPC in each sample was calculated and then compared each other.

• 자원환경지질
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• 제29권3호
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• pp.247-256
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• 1996

Mineral commodities of metallic ore deposits related to Cretaceous granitoids in the Taebaegsan basin are distinguishable by rock types, diffferenciation index (D.I.) and chemical compositions. Deposits of Fe-Cu are related to granodiorite-quartz monzonite, those of Pb-Zn and W-Mo to granite-granodiorite and granite respectively. The ranges of D.I. of the granitoids are 39~71 for Fe-Cu deposits, 68~81 for Pb-Zn deposits, 78~89 for W-Mo deposits and 91~94 for Mn deposits. Major oxides of $K_2O$, CaO, MgO, FeO and $TiO_2$ and some trace elements and Rb/K, Sr/Ca and Cu/Fe also show distinguishable differences among the Cretaceous granitoids related to various mineral commodities of the ore depsits.

• 대한화학회지
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• 제17권6호
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• pp.439-443
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• 1973

은에 한하여 대단히 예민한 시약으로서 2-mercaptothiazoline를 알게 되었으며, 이 시약으로 은의 전류법 정량에 뛰어나게 이용할 수 있다. 이 방법은 암모니아 수용액에서 2-mercaptothiazoline으로써 전류법적정에 의한 미량의 은을 정량하는데 EDTA를 막기제로 사용하여 많은 다른 이온들의 존재하에 대기중에서 미량의 은을 직접 적정할 수가 있었으며 방해 이온들은 금과 백금 뿐이나, 미량의 은을 이 방법에 의하여 상대오차 ${\pm}$5% 이내로 정량할 수 있다.

• 대한화학회지
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• 제6권1호
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• pp.36-46
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• 1962

筆者는 週期表 1族에 適用되는 液體金屬의 模型으로서 純粹한 液體金屬은 2原子分子의 單振動子로 構成되면 이 振動子는 自己가 古有하는 싸이트(site)種에 따라 두가지 에너지狀態中 하나를 取하게 된다고 假想함으로써 液體狀態和를 誘導하였다. 이 狀態和食은 本質的으로는 하나의 物質固有의 常數(${\Theta}$)를 內包하고 있으며 液體金屬에 대하여 이 特性値를 줌으로써 여러가지 熱力學的 性質 즉 蒸氣壓, 液體의 엔트로리, 比熱 等을 算出하여 實測値와 比較하여 보았다. 그 結果는 滿足스러운 一致를 보여준다.