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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Analytical Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Analytical Science
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Volume & Issues
Volume 5, Issue 3 - 00 1992
Volume 5, Issue 2 - 00 1992
Volume 5, Issue 1 - 00 1992
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Separation of Non-Volatile Compounds Unsuitable for GC Using Supercritical Fluid as Mobile Phase
Pyo, Tong Jin ; Kim, Hoon Ju ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 153~158
In this work, we developed supercritical fluid chromatographic methods for the samples which are difficult to analyze with conventional GC or HPLC. Long-chain Hydrocarbons, mink oils and soybean oils unsuitable for GC because of their low volatility or limited thermal stability were separated by SFC due to the high solvating properties of supercritical carbon dioxide fluids. In our research, a new method for the analysis of polar fatty acids and pesticides was developed. This method should be used to overcome problems with polar samples in SFC.
Determination of Trace Amount of Linear Alkylbenzene Sulfonates in River Water
Hong, Sa Uk ; Yoo, Young Chan ; Chung, Hee Sun ; Chung, Kyu Hyuck ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 159~167
An improved and accurate method for the determination of linear alkybenzene sulfonate(LAS) in river water is described by using gas chromatography and GC/MS. The gas chromatograph equipped with BP-5 capillary column was satisfactory for isolation of the homologues and isomers of LAS in river water. Four LAS homologues,
alkyl chains were determined in Jungrang stream, Jinwi stream and down stream of Han river tributary. Especially
of LAS were identified by mass chromatogram. Different composition of LAS in standard and river water expressed the distribution and fate of LAS in river water. The remarkable reduced content of
in river water implied that the biodegradation of LAS more easily occured in longer alkylchain one. This method would be applicable for determination of LAS in water with high resolution and sensitivity.
Development of the Ion Source of Glow Discharge/Mass Spectrometry for the determination of trace elements
Woo, Jin Chun ; Lim, Heoung Bin ; Moon, Dae Won ; Lee, Kwang Woo ; Kim, Hyo Jin ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 169~176
Analytical detection limits and Relative Ion Yield (RIY) by a jet type ion source glow discharge mass spectrometer(GD/MS) have been measured. With a jet type ion source, the sample loss rate for a Cu sample is 0.23 mg/min with 0.1 L/min gas flow rate and 0.11 mg/min with no gas flow rate. However, the ion intensity of Cu does not change significantly with thee variation of the gas flow rate. The RIY values obtained from the calibration curves of the six copper based standards were between 0.57 of Fe and 3.5 of Cr. The detection limits of most elements were in the range of 0.9 and 2.0 ppm when the glow discharge was operated at 4 mA, 1000V.
Optimization of Response Characteristics of pH-ISFET Glucose Sensor
Lee, Heung Lark ; Yang, Seung Tae ; Jung, Doog Sook ; Kim, Chang Soo ; Sohn, Byung Ki ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 177~184
A preparation method and response characteristics of a glucose sensor which consisted of pH-ISFET and glucose oxidase-immobilized membrane were investigated. The pH-ISFET glucose sensor was fabricated by immbilizing bovine serum albumin and glucose oxidase with glutaraldehyde on gate of the pH-ISFET. Effects of pH and concentration of working buffer and enzyme load on the pontentiometric response of the pH-ISFET glucose sensor were examined. Response characteristics for the determination of glucose in synthetic physiological saline solution(pH 7.4) were as follows. That is the concentration range of linear response, slope of linear response(sensitivity), and response time were
, 4.1 mV/decade, and 12~15 min., respectively.
Direct analysis of steels with a gas-jet assisted glow discharge lamp for atomic absorption spectrometry
Kim, Hyo Jin ; Woo, Jin Chun ; Lim, Heoung Bin ; Moon, Dae Won ; Lee, Kwang Woo ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 185~190
A gas-jet assisted glow discharge lamp was attached to a conventional atomic absorption spectrophotometer in the place of a flame burner. To evaluate the accuracy of this method, the certified values and the analyzed values of SRM's were compared and atomic absorption sensitivity for five elements were also obtained. Factors affecting the sensitivity and areas for future improvement are discussed.
Provenance and Microstructures of an Ancient Korean Bronze Dagger
Choi, Ju ; Do, Jung Man ; Kim, Soo Chul ; Kim, Sun Tae ; Eom, Tae Yoon ; Kim, Jung-Bae ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 191~197
An ancient Korean bronze dagger excavated from Yongjai-ri, Iksan-kun, presumed to be manufactured in the pre-historical age, was examined by means of chemical analysis, energy dispersive spectrometry, optical and scanning electron microscopy. Also the measurement of lead isotope ratios was carried out in order to predict the site where raw materials were produced. The composition was identified as 75.3% Cu, 17.1% Sn and 6.8% Pb which was a typical composition of Korean bronze dagger. The microstructure was consisted of
) eutectoid. The (
) eutectoid can be easily corroded in comparison with
. The segregation was frequently observed in the interior of the sample. According to the lead isotopes ratios, raw materials have possibility to be from North China.
SIMS analysis of the behavior of boron implanted into single silicon during the Ti-silicide formation
Hwang, Yoo Sang ; Paek, Su Hyon ; Cho, Hyun Choon ; Mah, Jae Pyung ; Choi, Jin Seog ; Kang, Sung Gun ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 199~202
Ti-silicide was formed by using metal-Ti target and composite target on the silicon substrate that
were introduced into. Implant energies of
were 50keV and 90keV. The behavior of boron was investigated by SIMS. The redistribution of boron occurred during the formation of Ti-silicide by metal-Ti target and the sample implanted at the energy of 50keV showed severe out-diffusion. In the case that Ti-silicide was formed by composite target, there was little redistribution of boron.
The Influence of Vanadium Addition on Fracture Behavior and Martensite Substructure in a Ni-36.5at.%Al Alloy
Kim, Young Do ; Choi, Ju ; Wayman, C. Marvin ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 203~211
Fracture behavior and martensite substructure of Ni-36.5at.%Al alloy were investigated with the addition of vanadium which is known as scavenging element of grain boundary. The fracture surfaces were examined by scanning electron microscopy and the EDX spectrometer was applied for composition analysis of fracture surfaces. The substructure of martensite was studied by transmission electron microscopy. By addition of vanadium, fracture surfaces show mixed modes of intergranular and transgranular fracture and more Al content is found on the grain boundaries. For Ni-36.5at.%Al alloy, the planar faults observed in the martensite plates are the internal twins. By increasing the vanadium content, the modulated structure with stacking faults and dislocations dominates while the twinned martensite disappears. The stacking fault is determined to be extrinsic due to the substitution of V for Al. It is concluded that the segregation of sulfur on the high-energy state stacking fault area suppresses the intergranular fracture.
Compensation in LPLEC GaAs Single Crystals
Ko, Kyung Hyun ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 213~216
Semiinsulating GaAs crystals employing LPLEC technique should be grown from the Ga-rich melt due to a very low incorporation of unintentional impurities such as carbon (<
). High resisitivity of this material can be derived from the balanced compensation among not only EL2 deep donors and carbon acceptors but also H1 double charge native acceptors(Ev + 77meV, Ev + 200 meV) and H2 native acceptors(Ev + 68 meV). Considering of the complicated compensation mechanism using statistical calculation of the electron occupancy of each level, SI GaAs crystal with low impurity contents(<
) can be successfully obtained by maintaining the melt composition around 0.45 As mole fraction.
AIN Microstructure Evalution through Hg-porosimetry
Lee, Hae-Weon ; Yoon, Bok-Gyu ; Hong, Kug-Sun ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 217~222
An attempt was made to analyze green microstructure of AIN samples prepared by slip casting and dry pressing through Hg-porosimetry. Slip cast samples with narrow pore size distribation and high packing density showed higher sinterability and homogeneous distribution of second phase(s). Hg-porosimetry is and effective way to determine pore structure if "ink bottle" phenomenon does not occur. A comparison study with porosity measurement by quantitative microscopy showed that the effectiveness of Hg-porosimetry measurement could be extended to higher sintered density as long as pores remained open.
Relationship between Carrier Concentration and Superconducting Transition Temperature in Bi-Sr-Ca-Cu-O Superconductor
Kim, Myung Chul ; Park, Soon Ja ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 223~228
-based superconductor phases were synthesized by the wet process using acetate precursors. Superconducting transition temperature (
) was determined from both measurements of electrical resistivity and magnetic susceptibility for the samples which were sintered at the temperatures of
for 40 hours, respectively. The values of carrier concentration from Hall measurements were compared with
data as a function of the sintering temperature. The formation mechanism of the superconducting phase was tentatively discussed on a basis of the distribution profile concept of the carrier concentration and the amount of superconducting phases in a ceramic bulk. This explanation may be supported by the experimental results of correlation between the relative amount of superconducting phases and the difference of
values between superconducting onset temperature and cutoff temperature at each sintering temperature.
The Quality Assessment of Honey by Stable Carbon Isotope Analysis
Hawer, Wooderck ; Ha, Jaeho ; Nam, Youngjung ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 229~234
Stable Isotope Mass Spectrometric technique was studied for quality assessment of Korean Honey and compared with the current regulation for the feasibility of adaptation to the regulation.
Determination of Mercury in Some Medicines by Flame Atomic Absorption Spectrometry Using Cold Vapour
Cha, Ki-Won ; Ha, Sang-Gun ;
Analytical Science and Technology, volume 5, issue 2, 1992, Pages 235~238