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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Analytical Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Analytical Science
Editor in Chief :
Volume & Issues
Volume 18, Issue 6 - Dec 2005
Volume 18, Issue 5 - Oct 2005
Volume 18, Issue 4 - Aug 2005
Volume 18, Issue 3 - Jun 2005
Volume 18, Issue 2 - Apr 2005
Volume 18, Issue 1 - Feb 2005
Selecting the target year
Spectroscopic Studies on the Preparation of Sol-Gel Derived TiO
Jung, Miewon ; Yeum, Sujin ; Lee, Bockim ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 1~4
sol which reacts with a solution of prehydrolysed
was made by addition of acetic acid. The structure evolution of the reaction mixture was monitered by
NMR and FT-IR spectroscopy.
A study on the HTS-NAA/γ-spectrometry for the analysis of alpha-particle emitting impurities in silica
Lee, Kil Yong ; Yoon, Yoon Yeol ; Cho, Soo Young ; Yang, Myung Kwon ; Shim, Sang Kwon ; Kim, Yongje ; Chung, Yong Sam ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 5~12
It has been established that soft error of high precision electronic circuits can be induced by alpha particles emitted from the naturally occurring radioactive impurities such as U, and Th. As the electronic circuits have recently become lower dimension and higher density, these alpha-particle emitting radioactive impurities have to be strictly controlled. The aim of this study is to develop of NAA (Neutron Activation Analysis) and gamma-spectrometry to improve the analytical sensitivity and precision of U and Th. A new NAA method has been established using the HTS (Hydrulic transfer system) irradiation facility which has been used to produce radioisotopes for industries and medicines instead of the PTS (pneumatic transfer system) irradiation facility which has been used in general NAA. When the ultratrace impurities have to be analyzed by NAA, background gamma-ray spectra induced from
and its progenies in air is serious problem. This unstable background has been eliminated or stabilized by the use of a nitrogen purging system. Ultra trace amounts of U (0.1 ng/g) and Th (0.01 ng/g) in high purity silica used for EMC could be analyzed by the use of HTS-NAA and low background gamma-spectrometry.
Comparison of the elution patterns for polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDDs/Fs) and dioxin-like polychlorinated biphenyls (PCBs) by manual open columns and automatic parallel LC columns
Ahn, Yun Gyong ; Shin, Jeoung Hwa ; Yoo, Sun Young ; Khim, Jeehyeong ; Hong, Jongki ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 13~22
The elution patterns of seventeen 2,3,7,8-substituted PCDDs/Fs and 12 dioxin-like PCBs were studied by both manual open columns and automatic parallel LC columns in cleanup procedure. PCDDs/Fs and non-ortho-PCBs from other mono-ortho-PCBs were separated on automatic LC column, whereas they were not separated on an open manual column. The elution study on two cleanup methods was carried out using the PAR solution of unlabeled congeners and checked the recovery of each congener. Total recoveries of cleanup fractionation were ranged between 61.9 ~ 96.0% for PCDDs/Fs and 70.4 ~ 79.0% for PCBs by manual open columns and 71.8 ~ 104.5% for PCDDs/Fs and 61.3-120.3% for PCBs by automatic parallel LC columns, respectively. Unfortunately, #169-HxCB and 1,2,3,7,8-PeCDD were not separated on DB-5MS capillary column. The ions of 1,2,3,7,8-PeCDD were selected at M/M+2 instead of M+2/M+4 suggested by EPA method 1613. It is possible to discriminate 1,2,3,7,8-PeCDD and PCB #169 in HRGC/HRMS analysis.
A Comparative Study on the Determination of the Selenium in Biological Samples using
Moon, Jong-Hwa ; Kang, Sang-Hoon ; Kim, Sun-Ha ; Chung, Yong-Sam ; Kim, Young-Jin ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 23~26
Se is well known as an anti-oxidant trace element and many customers are interested in an analysis and contents of Se in the various foodstuff samples. This study was aimed at establishig and comparing an analytical method for the determination of the Se in biological samples by neutron activation analysis using two nuclides,
. Keeping this objective, three NIST biological standard reference materials were chosen and the concentrations of the Se were determined under the prefixed analytical conditions such as the irradiation, decay and measurement time. The measured values by both analytical methods were evaluated with certified values. In addition, the detection limits and measurement uncertainty for the analytical results using
were compared with each other.
Study in the Measurement of Boron Isotopes by Thermal Ionization Mass Spectrometer
Jeon, Young Shin ; Joe, Kih Soo ; Han, Sun Ho ; Park, Yong Joon ; Jee, Kwang Yong ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 27~34
were synthesized with boron isotopic standard material for the measurement of boron isotopes of positive ions (PTIMS) such as
(mass 56, 57) and
(mass 88, 89) instead of boron mass 10 and 11. The negative ions (NTIMS) such as
(mass 42와 43) were also measured with the same boron isotopic standard material. The precision and accuracy were compared between each method, and prescan of isobaric effect was studied. Good result was obtained from NTIMS method which provided the stable and enough peak intensities with good precision and accuracy. The measurement of boron isotopes were performed in ground water sample with about 8 ng-B (
sample solution) obtained from IAEA for international inter-comparison analysis. The standard deviation was found to be 0.03%. Boron content of this ground water was measured using the NTIMS-IDMS. The result was
which was better precision compared to the ICP-AES result.
Study on the Effect of the Mg
Ion on the Behavior of Anionic Surfactants in Electrophoresis
Jeong, Hyuk ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 35~42
This study reports the effect of
ions on the behavior of the anionic surfactant in electrophoresis. Intractions of
ions with carboxylates and sulfonates resulted large changes in their apparent mobilities. A comprehensive analysis of the electroosmotic and electrophoretic mobilities reveals that major cause for the variation of the apparent mobilities of anions arises from the electroosmotic mobilities.
Some considerations for the determination of carbonyl compounds in air: Reaction characteristics of formaldehyde with 2.4-DNPH
Hong, Y.J. ; Kim, K.H. ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 43~50
A number of carbonyl compounds including formaldehyde and acetaldehyde are well known for their toxicity and irritancy. Hence, acquisition of both qualitative and quantitative tool for their analysis is essential to resolve issues associated with malodor or indoor pollution. Using HPLC/UV method, we examined various aspects involved in the measurements of formaldehyde in environmental samples. The results of our analysis indicated that its detection was made as low as 0.5 ppb (assuming 5 L of sample volume), while its precision was maintained near 2% in terms of relative standard error (RSE). When the stability of calibration was checked by variability of slope values obtained over long-term period (e.g., one month), its values were found to remain constantly with RSE values of 3%. It was also found that liquid-phase reaction between formaldehyde and DNPH proceed very slowly to attain equilibrium (one and half hour), while requiring adequate amount of DNPH to form their derivatives. The overall results of our study thus suggest that there are a number of factors to consider for the accurate analysis of formaldehyde in ambient air.
Comparative Analysis of Elemental Components in Airborne Particulate Matter by k
Chung, Yong-Sam ; Moon, Jong-Hwa ; Cho, Hyun-Je ; Kim, Young-Jin ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 51~58
A comparison of the analytical data obtained by three
-NAA software programs was carried out using both the airborne particulate matter collected from an urban site and the certified reference materials of the air filter and urban dust to evaluate the performance of the analysis. The individual
-NAA standardization methods of three countries, Korea, China and Vietnam which had been modified from the well established
-program were used for the comparative analysis. The measured concentrations of 30 elements from the two kinds of air samples based on this software were in agreement with each other within about 20% analytical error except for a few elements. By contrast, the results of China and Vietnam were moderately higher than that of Korea due to a systematic error associated with the detection efficiency, gamma peak analysis and geometric effect.
Variation of the Detection Efficiency of a HPGe Detector with the Density of the Sample in the Radioactivity Analysis
Seo, Bum-Kyoung ; Lee, Kil-Yong ; Yoon, Yoon-Yeol ; Jung, Ki-Jung ; Oh, Won-Zin ; Lee, Kune-Woo ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 59~65
When the low level radioactivity sample is measured, it is required to have many samples. For increase of the sample volume, a scattering and absorbing probability of the emitted gamma-ray in the sample are to be increased. In order to correct the self-absorption effect, the counting efficiency must be calibrated according to a geometrical condition and sample density. But, it is impossible to determine efficiency for counting sample using standard source with the same geometrical condition and density. In this study, the measuring efficiencies were determined with various counting containers and densities. In order to compare the self-absorption effect with the sample density in the various sample container, the variation of the counting efficiency with the densities was investigated by adding NaI, which has high solubility and density. Also, they were compared with Monte Carlo simulation. The self-absorption effect was found to be significant in the low energy region below 0.5 MeV.
Changes in the gas chromatographic sensitivity with its analytical setting: Comparison of TDU and loop-injection system for the analysis of sulfur compounds
Kim, Ki-Hyun ; Choi, Y.J. ; Kim, S.C. ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 66~73
In this study, we investigated the gas chromatography (GC) and pulsed flame photometric detection (PFPD) system for the analysis of four major reduced S compounds including hydrogen sulfide (
); methyl mercaptan (
); dimethyl sulfide (DMS); and dimethyl disulfide (DMDS) contained in environmental samples. To analyze these compounds in high concentration range (above ppb level), we developed a high mode analytical setting with the loop-injection system. By contrast, we also established a low mode setting for the analysis of low concentration samples (ppt-level samples from ambient air) by the combination with thermal desorption unit (TDU). Comparative analysis of both settings revealed that relative detection properties of four S compounds are systematic enough. The results of high mode analysis indicated that the patterns were systematic among S compounds:
exhibited the lowest sensitivity, while DMDS showed the strongest one. The results were also compared in terms of sensitivity reductions for all compounds by dividing slope ratios between low and high mode system. Although low mode system exhibited significant reductions on the order of a few tens times, their detection characteristics were highly consistent as it was shown in the high mode setting. To learn more about absolute and relative relations between two different modes of S analysis, future studies may have to be directed to cover more complicated nature of GC/PFPD performance.
Development of Certified Reference Materials for Specific Surface Area
Choi, Byung Il ; Kim, Jong Chul ; Kim, Taeyoung ; Nham, Hyunsoo ; Kwon, Su Yong ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 74~84
Understandings of adsorption characteristic of interface are very important in several advanced materials processes, related to NT and BT technology. Volumetric gas adsorption method, suitable for absolute measurements, is regarded as the standardized measurement technique for specific surface area. In order to verify the reliability of commercial equipments, certified reference materials (called CRM) of specific surface area are developed and evaluated its uncertainty factors by standard equipment which has traceability to SI units. Specific surface areas of developed materials are
for silicon nitride powders and
for alumina. These disseminations of CRMs would result in improved reliability chains in industrial processes, and lead eventually to contribution to productivity improvement, quality management, safety evaluation, and possibly to new material development.
Application of Pulsed Field Gradient Long-range COSY-NMR for the Assignment of Geminal Protons on Rigid System: supplemental method of NOE Experiment
Lee, Sueg-Geun ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 85~88
Antiphase character of cross peaks in long-range COSY is modulated by changing the fixed delay time and used to assign diastereotopic methylene protons on rigid systems which could produce unpredictable NOE phenomena because of complicate coupling spins.
Enhancement of Fluorescent Properties and Electrochemical Reduction of Coumarin Derivatives
Chun, Hyun Ja ; Kim, Sung Hyun ; Jung, Eun Joo ; Lee, Hye Suk ; Kim, Il Kwang ;
Analytical Science and Technology, volume 18, issue 1, 2005, Pages 89~95
Studies on the electrochemical reduction of 7-acetoxy-4-bromomethyl-coumarin (ABMC), 7-acetoxymethyl coumarin (AMC), and coumarin in 0.1 M tetraethyl ammonium perchlorate acetonitrile solution were carried out with direct current, differential pulse polarography, cyclic voltammetry, and controlled potential coulometry. The electrochemical reduction of ABMC was proceeded through three irreversible steps coupled with the chemical reactions. The solution color was changed to yellow when the carbonyl group was reduced during second step and the color change was independent with bromo group of ABMC. Fluorescent intensity was highest when the electrochemical reduction was controlled at near the overpotential of supporting electrolyte (-2.3 volts).