• 한국응용과학기술학회지
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• 제22권1호
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• pp.77-83
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• 2005

The influence of fluorescence, scattering, and absorbance in turbid material by light scattering was interpreted by the scattered fluorescence intensity and wavelength. The effect of optical property in scattering media was investigated. It is very important to study the charge coupled device(CCD) in spectrometry because we can use the molecular energy level, molecular structure, absorption or emission, intermolecular reaction, weakly bound molecular energy, photochemistry, fluorescence and photodynamic therapy. CCD is very essential to study the molecular structure and medical engineering combined laser spectroscopy in the modem physical and chemistry. Accordingly, this study has designed and manufactured the electromagnetic spectrometry with CCD, and has analyzed the hematoporphyrin derivative.

• 분석과학
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• 제32권4호
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• pp.121-130
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• 2019

Alumina is one of the most important ceramic materials because of its useful physical and chemical properties. Recently, high-purity alumina has been used in various industrial fields. This leads to increasing demand for reliable elemental analysis of impurities in alumina samples. However, the chemical inertness of alumina makes the sample preparation for conventional elemental analysis a tremendously difficult task. Herein, we demonstrated the feasibility of laser ablation for effective sampling of alumina powder. Laser ablation performs sampling rapidly without any chemical reagents and also allows simultaneous optical emission spectroscopy and mass spectrometry analyses. For six alumina samples including certified reference materials and commercial products, laser-induced breakdown spectroscopy (LIBS) and laser-ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) analyses were performed simultaneously based on a common laser ablation sampling. LIBS was found to be useful to quantify alkali and alkaline earth metals with limits-of-detection (LODs) around 1 ppm. LA-ICP-MS could quantify transition metals such as Ti, Cu, Zn, and Zr with LODs in the range from a few tens to hundreds ppb.

• 한국축산식품학회:학술대회논문집
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• 한국축산식품학회 2001년도 임시총회 및 제28차 추계학술발표회
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• pp.152-152
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• 2001

• 분석과학
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• 제14권1호
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• pp.21-27
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• 2001

본 실험에서는 유도결합 플라스마 원자방출 분광법 (ICP-AES)에서 perfluoroalkoxy (PFA) nebulizer와 microconcentric nebulizer (MCN)을 이용하여 본 실험실에서 제작된 double membrane desolvator (DMD)의 분석능력을 연구하였다. MCN과 비교하여 PFA nubulizer는 수용액 시료의 경우에는 DMD-ICP-AES에서 비슷한 분석감도를 보였으나, isopropyl alcohol 시료에서는 좀 더 나은 분석감도를 보였다. PFA nebulizer는 여러 가지 산들에 견디기 때문에 HCI, $H_2SO_4$ 뿐만 아니라 HF 용액도 도입하여 분석할 수 있었는데, 모두 2% 미만의 상대표준편차로 분석되었다. 기억효과를 측정한 결과, 신호가 1% 미만으로 감소되는 rinse-out time은 PFA에서는 35초인 반면 MCN은 45초로 얻어졌다.

• 한국환경보건학회지
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• 제33권5호
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• pp.397-402
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• 2007

The present study was initiated to examine the measures of dietary intake of Fe, Cu and Zn. The food duplicate samples were collected in Busan and its neighboring area, from the 69 middle-aged women (healthy non-smoking, mostly house wives), who provided informed consent. The samples were wet ashed by being heated in the presence of mineral acids, and Fe, Cu, Zn in the wet-ashed samples were analyzed by inductively coupled plasma - atomic emission spectrometry(ICP-AES). Dietary intake of Fe, Cu and Zn were 10.4 mg/day in Fe, 1.2 mg/day in Cu, 7.4 mg/day as arithmetic mean. The values for dietary Fe and Zn were lower, and the values for dietary Cu were higher than the recommended daily intake from Korean Nutrition Society. Further studies of Korean foods are needed to clarify the representative values for daily dietary Fe, Cu and Zn intake in the Korean population.

• Bulletin of the Korean Chemical Society
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• 제29권2호
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• pp.393-397
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• 2008

Inductively coupled plasma atomic emission spectrometry (ICP-AES) was used to determine the presence of germanium and phosphorus in a pure gold bonding wire. The samples were dissolved with hydrobromic acid and nitric acid at room temperature. The quantitation limits were 0.012 mg L-1 at 265.118 nm for Ge and 0.009 mg L-1 at 177.495 nm for P. Using the mixed acid digestion formula of DIW+HBr+HNO3, the recoveries were in the range of 98-100% and the relative standard deviation was within 1.1-2.3%. On the other hand, the amount of Ge decreased by about 16.2% using DIW+HCl+HNO3, due to the formation of a volatile compound. The Ge contents determined using the external method and the standard addition method were 9.45 mg kg-1 and 9.24 mg kg-1, respectively, and the P contents, using the same methods, were 22.49 mg kg-1 and 23.09 mg kg-1, respectively. Both methods were successfully used to determine the trace amounts of P and Ge in the pure gold bonding wire samples.

• 분석과학
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• 제20권3호
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• pp.251-254
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• 2007

수용액 내에서 환원제인 sulfurous acid와 휘발성이 강한 Os(III)을 반응시킨 후 생성된 비휘발성 Os(IV)을 inductively coupled plasma atomic emission spectrometry (ICP-AES)로 분석하였다. pH 2-10의 수용액에서 sulfurous acid와 Os(VIII)의 정량적 반응에 의하여 생성된 Os(VI)을 ICP-AES로 분석하였다. 동축형 분무기(concentric type nebulizer)에 의한 시료 도입 방법에서 sulfurous acid와 osmium은 반응 직후부터 안정한 신호를 나타내었으며 다양한 ICP-AES 조건에서 3회 반복 측정했을 때 재현성은 0.5-4.5%였으며, 검출 한계는 2.5-57.7 ng/g이었다.

• Applied Science and Convergence Technology
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• 제24권6호
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• pp.273-277
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• 2015

We investigated secondary electron emission characteristics of ZnO thin films prepared by pulsed laser deposition method with respect to the ambient oxygen pressure and the substrate temperature during the deposition. X-ray diffraction, UV-Vis spectrometry, atomic force microscopy, and ${\gamma}$-FIB were used to examine the structural, optical transmission, surface morphology, and secondary electron emission properties of the films, respectively. The secondary electron emission coefficient of the ZnO films increases as the O/Zn ratio of the films increases which was thought to result from either the ambient oxygen pressure increase or the substrate temperature decrease and as the grain size of the films decreases. It was confirmed that ZnO has better secondary electron emission characteristics than those of MgO, which is currently widely used as a material for PDP protecting layers.

• 분석과학
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• 제5권3호
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• pp.277-283
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• 1992

질산, 염산, 황산 그리고 질산과 염산의 1:1 혼산의 농도를 변화시키면서 유도결합 플라즈마 원자방출분광법(ICP-AES)의 신호크기에 미치는 산의 영향을 연구하였다. 거의 모든 측정원소의 신호크기가 감소되었다. 산의 존재로 인한 감소는 산 농도가 1% 이상 될 때 심하게 눈에 띄었고, 사용된 산 중에서 황산에 의한 감소가 가장 심했으며 그 정도를 예측하기 힘들었다. 산의 농도를 변화시키면서 측정 원소의 신호크기 대 Ar 신호크기의 비, 그리고 Mg II 신호크기 대 Ma I 신호의 비를 측정하였다. 이 연구에서, 신호크기 감소의 주된 원인은 플라즈마 들뜸특성의 변화에 의한 것이 아니고, 분무효율의 변화, 예를 들면 droplet 크기분포, 점도와 표면장략의 변화 등인 것으로 판명되었다. 유도결합 플라즈마 질량분석법(ICP-MS)에서는 신호크기의 감소와 이온화 에너지와의 상관관계는 발견되지 않았다.

• Bulletin of the Korean Chemical Society
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• 제28권5호
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• pp.767-771
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• 2007

By adopting a time-resolved optical emission spectrometry, we have investigated the effects of transverse magnetic field on C2 and CN molecules produced by laser ablation of a graphite target in nitrogen atmosphere. We found that the spectroscopic temperatures of both species, obtained via simulation of the optical emission spectra, as well as their emission intensities from the electronically excited states increased significantly in the presence of a magnetic field. The cyclotron radii and frequencies for electrons and ions were estimated to explain the increase in the number of collisions in the laser-produced carbon plasma plume under a magnetic field.