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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Analytical Science and Technology
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Journal DOI :
The Korean Society of Analytical Science
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Volume & Issues
Volume 11, Issue 6 - 00 1998
Volume 11, Issue 5 - 00 1998
Volume 11, Issue 4 - 00 1998
Volume 11, Issue 3 - 00 1998
Volume 11, Issue 2 - 00 1998
Volume 11, Issue 1 - 00 1998
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Electrochemical Studies on the Methylviologen-Sodium Dodecyl Sulfate Solution in the Presence of
Ko, Young Chun ; Chung, Keun Ho ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 151~155
Electrochemical behaviours on 1.0 mM methylviologen (
) in 100 mM NaCl+27 mM
solution, without and with sodium dodecyl sulfate (SDS), were studied. The intersection of two lines on
(the difference between the anodic,
, and the cathodic,
, peak potentials) of the first and second redox waves vs. -log[SDS] plot was determined as a critical micelle concentration (CMC). When
was added, the effective access of
to the glassy carbon electrode surface became possible and the formation of micelles was retarded.
Structural and Thermal Characteristics of Synthesized SiC by Carbothermal Reaction and Sol-gel Method
Oh, Won-Chun ; Kim, Bum-Soo ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 156~160
SiC is synthesized by sol-gel and carbothermal reaction method from various carbon sources and Si source and characterized through the results of DSC and XRD. More SiC has been formed in carbothermal reaction than sol-gel method. From the XRD results, the degree of formation of SiC increases in the order of petroleum cokes, activated carbon, artificial graphite all in two introduced methods. Based on the DSC data, the enthalpy values for the exothermic reaction decrease in the order of activated carbon, petroleum cokes, artificial graphite in carbothermal reaction methods, while those for the endothermic reactions increase in the reverse order. But, the enthalpy values for the exothermic reactions decrease in the order of petroleum cokes, activated carbon, artificial graphite in sol-gel methods.
Determination of Haloperidol Serum Levels in Psychiatric Patients with Gas Chromatography-Nitrogen Phosphorus Detection
Paik, Man-Jeong ; Kang, Bo-Kyoung ; Lee, Kyoung-Ok ; Shin, Ho-Sang ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 161~166
Analytical method of haloperidol (HAL) in serum which has been widely used in therapy of schizophrenic disorders is developed. Gas chromatography/nitrogen-phosphorus detection (GC/NPD) was used for this study. Bromoperidol was used as an internal standard and diethylether as a solvent of three-step extraction. The extraction yield in this procedure was
at 15 ng/mL. A good linear response in the range of 1~40 ng/mL was obtained with correlation coefficient of
. Detection limit was 0.5 ng/mL when 2 mL of serum was used. This method was applied for the analysis of HAL in serum of schizophrenic patients. After HAL decanoate (HD) was intaken as intramuscular route, HAL levels were determined at second week and forth week. From the result, the concentration of HAL at forth week appeared to 29.6% lower than those at second week. The present method showed low detection limit and high selectivity. Therefore it can be applied for the trace analysis of HAL in serum and the monitoring.
Development of Analytical Techniques for Human Serum and Urine by Using Glow Discharge
Lee, Sang Chun ; Choi, Kyung-Soo ; Son, Eun-Ho ; Sim, Young-Jin ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 167~173
An electrothermal vaporization-hollow cathode glow discharge-atomic emission spectrometer(ETV-HCGD-AES) has been developed for detecting heavy metals in human serum and urine samples. Fisrt of all, we designed a glow discharge cell for atomic emission spectrometry and its analytical performance was studied with the standard reference materials(SRMs) purchased from the NIST. Practically, the ETV-HCGD-AES demonstrated better instrumental sensitivity and selectivity for detecting Hg and Pb in the SRMs, serum and urine, than ICP-OES since the ETV-HCGD-AES was not required the complicate sample digestion procedure, which improved sample transportation efficiency.
Adsorption and Preconcentration of Some Heavy Metals by Resorcinol-Formaldehyde Resin
Park, Chan-Il ; Cha, Ki-Won ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 174~178
A chelating resin was prepared by the reaction of formaldehyde and resorcinol. It possesses high adsorption selectivity for transition metal ions such as Pb(II) and Ni(II). The adsorption and desorption yields of Pb(II), Ni(II), Co(II), Fe(II) and Zn(II) were determined using batch method. The significant characteristics of the chelating resin is the exchange processes between its hydrogen and metal ions. The mechanism of metal adsorption and desorption seems to be the competing protonation and complexation reaction of the functional group of the resin. This resin was applied to the rapid concentration of trace amounts of these metal ions and to the separation of Pb(II) from other metal ions in bulk solution.
Retention Behavior and Separation of Phenol Derivatives through Cyclodextrin Complexes in Reversed-Phase Liquid Chromatography
Moon, Young-Ja ; Kang, Sam-Woo ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 179~188
The capacity factor of fifteen phenol derivatives was determined with respect to the concentration of
-cyclodextrin [CD], the type as well as the content of organic solvent in the mobile phase, and the temperature. The effect of the inclusion complex formation between solutes and
-cyclodextrin on their retention and selectivity has been investigated. The inclusion effect of
-cyclodextrin was the most effective in aqueous methanol, whereas only a poor effect was observed in aqueous tetrahydrofuran and aqueous acetonitrile. A plot of the reciprocal of the capacity factor against
gives a straight line and the dissociation constant,
of the inclusion complex can be calculated from the slope. It was possible to estimate the
values in 100% water from a linear plot of
vs. water content in the solution by extrapolation. The separation factor,
, of two compounds has been found to be affected not only by the
but also by their
values. Under optimum conditions, some mixtures of phenol derivatives were able to separate successfully.
Synthesis and Structural Analysis of Binary Alloy (
Park, Yong Joon ; Lee, Jong-Gyu ; Kim, Jong Goo ; Kim, Jung Suk ; Jee, Kwang-Yong ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 189~193
, have been prepared using arc melting furnace. Mo and the noble metals Ru and Rh are the constituents of metallic insoluble residues, which were found in the early days of the post-irradiation studies on uranium oxide fuels. Detailed structural informations about these alloys have not been reported on JCPDS files of ICDD (International Centre for Diffraction Data). The results of X-ray diffraction study showed that the alloy was crystallized in hexagonal close-packing, well known as
-phase. The X-ray diffraction patterns of these alloys matched well to that of
of space group. The lattice parameters, a and c, were calculated using the least squares extrapolation. It was found from X-ray photoelectron spectroscopic measurements that Mo on the surface of the alloy was oxidized to Mo(6+), which could be removed by sputtering with Ar ions for approximately 15 minutes. The changes in binding energy of Mo, Ru, and Rh on the surface of the alloy were not observed. Magnetic susceptibility measurements resulted in the typical Pauli-paramagnetic behavior in the temperature range of 2 to 300 K.
A Study on the Emission of Hazardous Volatile Compounds in Wood and Steel Furniture
Kim, Sun-Tae ; Park, Kyung-Su ; Kim, Byoung-Eog ; Woo, Soon-Hyung ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 194~201
The formaldehyde vapor produced from wood and steel furniture was absorbed in distilled water and derivatized with acetylacetone and determined by UV-visible spectrophotometry. Variation in HCHO emission with time was monitored at room temperature. The emission of volatile compounds from wood, wood-based and steel-based materials was investigated in a 50 mL glass vial. The concentration of the gases emitted in a glass vial was determined by ion-trap GC-MS.
Local Structure Study of Ni in Ni-Zn Alloy Coating on Steel by X-ray Absorption Spectroscopy
Lee, Do-Hyung ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 202~205
X-ray absorption fine structure spectroscopic studies at the Ni K-edge have been performed for the Ni-Zn alloy coating layer on steel. The Ni-Zn interatomic distances and Debye-Waller factors were determined by fitting the experimental data with the theoretical spectra in the temperature range of 80 to 300K. The average Ni-Zn interatomic distance was found to be
and the variation of the Ni-Zn interatomic distance with temperature in this range was insignificant. From the comparison of the Ni-Zn interatomic distance with the nearest neighbor distance of pure Zn lattice it has been suggested that there is an apparent contraction around Ni atom.
Survey and Control of The Occurrence of Mycotoxins from Postharvest Vegetables in Korea (II) Detection of Major Mycotoxins from Diseased Spice Vegetables (Onions, Garlics and Peppers)
Chung, Ill-Min ; Ju, Ho-Jong ; Sim, Sung-Chur ; Paik, Su-Bong ; Yu, Seung-Hun ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 206~212
The major mycotoxins were detected from peppers, onions and garlics infected postharvest pathogens, Alternaria, Penicillium and Fusarium. Analyses of the major mycotoxins were conducted using HPLC. Detected Alternaria mycotoxins per gram of infected postharvest peppers were alternariol (AOH) with amount ranged from small quantity to
, altenuene (ALT) with amount ranged from small quantity to
, tenuagonic acid (TeA) with amount ranged from 249 to
and alternariol monomethyl ether (AME) with amount ranged from 206 to
. Penicillium toxins per gram of infected postharvest onions and garlics were citrinin with amount ranged from 2.8 to
, penicillun-G with amount ranged from no detection to
, penicillic acid with amount ranged from no detection to small quantity and patulin with amount ranged from no detection to small quantity. Fusarium toxins per gram of infected postharvest onions and garlics were fusaric acid with amount ranged from no detection to
. However, deoxyrivalenol and nivalenol were not detected from onins and garlics infected by Fusarium.
Analysis of Inorganic Acids by Capillary Zone Electrophoresis
Park, Sung-Woo ; Jin, Kwang-Ho ; You, Jae-Hoon ; Kim, Dong-Hwan ; Seo, Baeseuk ; Kim, Young-Sang ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 213~221
The determination of inorganic anions by capillary zone electrophoresis is reported. A ten component synthetic mixture of anions of bromide, chloride, fluoride, nitrite, nitrate, sulfite, sulfate, perchlorate, chlorate and chlorite was separated by the capillary column and detected by indirect UV method. The running buffer contained 5 mM ammonium dichromate, 10 mM ammonium acetate, 20 mM diethylenetriamine, 10% methanol solution at pH 9.3. A potential of 15 kV at the cathode (reversed polarity) was utilized for the separation of inorganic anions. A complete separation of anions was achieved in less then 10 min and the applicabilities of the method for the analysis of real samples was demonstrated. We compare the concentration of anions in toluene inhaled humen's urine and in postmortem bloods obtained by capillary zone electrophoresis and ion chromatograph.
The Analysis of Ethanol Distribution Level in Biological Specimens
Hong, Hoon-Gi ; Kim, Dong-Wook ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 222~228
Five kinds of packed column and two kinds of capillary column were used to get optimum condition for ethanol analysis by using fifteen different volatile, low molecular weight organic substances. Only two columns, Gaskuropack 54 and DB-1, showed good separation efficiency. In the adding salt-effect experiment 0.6N - perchloric acid, 1M - meta-phosphoric acid and saturated NaCl solution were used for alcohol concentration measurement of biological fluids and tissue specimens. Among adding salt experiment, adding saturated NaCl solution showed the most stable value of alcohol concentration. This fact might be due to the increased vaporization of alcohol in the saturated NaCl solution. In the time-course of blood alcohol concentration, the alcohol level was lineary decreased to the diameter of vessel containing specimens. This result was interpreted in view of ethanol level, weight, water content, and hematocrit value. The ethanol distribution levels were measured from samples of blood and tissue obtained from 25 postmortems cases investigated by NISI. This study showed that the distribution level was decreased in order of brain, blood, kidney, spleen, liver, and lung.
Effect of New Conditions on Acidic Permanganate COD
Czae, Myung-Zoon ; Kim, Mi-Kyung ;
Analytical Science and Technology, volume 11, issue 3, 1998, Pages 229~230