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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 5, Issue 3 - 00 1992
Volume 5, Issue 2 - 00 1992
Volume 5, Issue 1 - 00 1992
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Electrochemical Determinations of Methylanilinium Ion Mixtures by the Stereoselective Complexations of Host-Guest
Jung, Jong Hwa ; Chang, Duk Jin ; Lee, Bu-Yong ; Seo, Mu Ryong ; Kim, Jae Sang ; Lee, Shim Sung ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 239~247
The complexations and selectivities of the 10 species of mono- and dimethylsubstituted anilinium ions with 18-crown-6 in methanol are examined at dropping mercury electrode. The stability constants of these complexes varies drastically due to the steric hindrance by the positions and numbers of methyl groups. And the analyses of the isomeric mixtures of methylanilinium, which are impossible to detect due to the overlapped peaks in normal conditions, were also accomplished by the additions of 18-crown-6 as the supporting complexing agent using the selective complexations by the steric hindrance effects. As results in case of the difference of stability,
were about 0.7~1.3, it was possible to confirm the existence of two species qualitatively. Otherwise when
were large than 1.6, the quantitative determinations of each species could be accomplished sucessfully. From these results it is deduced that the selective recongnition of the positions and numbers of methyl groups as the steric hindrance in anililniums by 18-crown-6 cause the large variation of the magnitudes of negative shift of reduction waves for guest ions in mixtures.
Electrochemical Studies on the Heavy Lanthanide Complexes
Pak, Chong Min ; Kim, Chae Kyun ; Son, Byung Chan ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 249~261
Electrochemical behavior of the heavy lanthanide complexes of alizarin red S(ARS) has been investigated by d. c. polarography, differential pulse polarography and cyclic voltammetry. The reduction mechanism at a mercury electrode of alizarin red S as a complexing ligand showed a one step of two-electron transfer and the electron process is found to be reversible. Alizarin red S forms a 3:1 adsorptive complexes with lanthanides and the complexes are reduced via one step of two-elctron. The reduction potential of complex wave(
) shifted more negatively than the ligand wave(
). The linear calibration curves of the decreacing
is obtained when the lanthanide concentration varies from
under the condition of pH 9.5, 0.1M LiCl and
Characterization of Atomic Emission Detector for Gas Chromatography Using Cylindrical Microwave Cavity
Park, Young-Joo ; Yoo, Hee-Soo ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 263~268
A plasma source with cylindrical microwave cavity was used as atomic emission detector for gas chromatography. Detection limits of several elements were determined for this system. Detection limits for bromine and sulfur were 0.46 pg/s and 0.51 ng/s, respectively. The plasma was stable at the range of flow rate of 10 to 20mL/min.
Development of Continuous Monitoring System of Acidic Pollutants for The Studies of Their Diffusion in The Atmosphere
Chung, Hyung-Keun ; Dasgupta, Purnendu K. ; Lee, Dai Woon ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 269~276
An ion-exchange/conductometric method is applied for the determination of total acidity in simulated atmospheric samples. Non-
cations and strong acid anions are enriched by the preconcentrator columns in series and eluted through the corresponding parallel suppressor units. The conductivities from each channel correspond to the concentrations of the resulting ionized species in equivalents per unit volume. The difference is the measure of acidity due to strong acids. With 5-min sampling at a flow rate of 0.3 mL/min, the detection limits for
are 0.3 and
, respectively. The acidity for samples composed of various ions can be determined without significant error, usually less than 5%. The proposed method discriminates against the artifact from the
dissolution. Principles of acidity measurements are also presented.
Some Effects of Acid Concentrations in Inductively Coupled Plasma Atomic Emission Spectrometry and Inductively Coupled Plasma Mass Spectrometry
Cho, Man-Sik ; Lim, Heoungbin ; Kim, Young-Sang ; Lee, Kwang-Woo ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 277~283
Acid effects on the ICP-AES signals are studied as the concentrations of nitric acid, hydrochloric acid, sulfuric acid, and 1:1 mixture of nitric acid and hydrochloric acid are changed. Almost all analyte signals are depressed. The extent of the depression due to the pressence of the acids became to be pecular when the acid concentration was over 1%. Among the acids used, the suppression due to sulfuric acid is most severe and unexpectable. The ratios of the analyte signal to Ar signal and the Mg II signal to Mg I signal are measured as the concentration of the acids changed. In this study, it is proved that the main reason of the signal reduction is the change in the nebulization efficiency, for example, droplet size distribution, viscosity and surface tension variation, not the alteration of plasma excitation characteristics. There was no relationship found between ionization potential and analyte signal reduction in ICP-MS.
The Infrared Absorption Spectra of Molecular Clusters of Acetonitrile and DMF Diluted by Matrices at 80K
Kim, Wan Hee ; Jeong, Jong Hak ; Jeong, Gi Ho ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 285~294
Structures of dimers of the acetonitrile and DMF diluted by carbon-tetrachloride and xenon matrices at 80K were studied with infrared absorption spectroscopy. Sample and matrix materials were codeposited onto a KBr cold trapping window. Infrared absorption spectra of pure samples and diluted samples were compared to explain the structures of dimers. The acetonitrile dimer showed the antiparallel shape and the DMF dimer showed the linear shape. After annealing, the infrared spectrum of the diluted sample showed the same shape with that of the pure sample.
Disign and Evaluation of a Versatile Data Acquisition and Control Adaptor for IBM Personal Computers
Kim, Haidong ; Song, Hyung Soo ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 295~301
A versatile data acquisition and control adaptor for IBM personal computers has been developed. The data acquisition and control adaptor developed contains major components necessary for computerized data acquisition and control instrumentaions. Up to 4 differential analog signals can be acquired through a choice of dual 12-bit analog-to digital converters depending on the experimental requirements. Also, dual 12-bit digital-to-analog converters, three 16-bit programmable most computerized laboratory data acquisition and control instrumentation. The design principle and its applications are described.
Initial Reactions of Ti on the Atomically Clean Si Substrates
Jeon, Hyeongtag ; Nemanich, R.J. ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 303~308
Initial reactions of Ti and Si have been studied to examine the surface roughness of titanium silicide. Formation mechanism has been explored with in-situ measurement tools such as AES(Auger electron spectroscopy) and LEED (low energy electron diffraction). One or two monolayers of Ti films have been deposited in ultrahigh vacuum on atomically clean Si(111) substrates. Atomically clean Si substrates which are reconstructed
Si(111) have been obtained after in-situ heat cleaning in ultrahigh vacuum. Deposition of the films were monitored by a quartz cuystal oscillator and the Ti films were analyzed with in-situ AES and LEED. The in-situ measurements show that the initial reactions of Ti and Si occur at room temperature and form a disordered layer. At low temperatures(
) intermixing of Ti and Si is detected by AES. Substrate
LEED patterns are displayed after
anneal. This indicates that the disordered layer has transformed to form an ordered surface. The reappearance of the
LEED pattern in observed with further high temperature anneals and indicates three dimensional titanium silicide island formation.
A study on the bonding Characteristics of Inorganic/Organic Composite by Measurement of the Glass Transition Temperature(Tg)
Lee, Dong-A ; Kim, Goo-Dae ; Kim, Hyun-Min ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 309~317
Inorganic/organic composite was synthesized by using sol-gel process, and the bonding characteristics of composite was investigated with glass transition temperature(Tg), measured by DMTA(Dynamic Mechanical Thermal Analyzer). It was found from shift of Tg to higher temperature that composite reaction was proceeded better with the amount of HCl and water. But Tg was not varied with reaction time.
Recrystallization Behavior of Mo-1.17 Ti-0.18 Zr-0.06 C Alloy
Yoon, Kook Han ; Lee, Chong Mu ; Choi, Ju ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 319~325
Plasma are melting method was used in making Mo-1.17 Ti-0.18 Zr-0.06 C ingot having over 99% of the theoretical density. Oxygen content herewith, decreased from the origin of 830ppm to 40ppm. After cold rolling of Mo alloy by 50%, the recrystallization behaviors were studied in the temperature range from
for 1 hr isochronical holding time and also at
for varying isothermal holding time 0 to 108000sec. The complete recrystallization temperature of Mo was
but that of Mo alloy was
. 50%-1 hr recrystallization temperature of Mo alloy sheet was about
and when compared to Mo there was an increase of over
. The activation energy of recrystallization of Mo alloy sheet was 508kJ/mol.
Composition-control of Mn-Zn Ferrite Single Crystal Using a Phase Diagram
Je, Hae-June ; Kim, In-Tae ; Hong, Kug-Sun ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 327~332
Mn-Zn ferrite single crystals show some fluctuations in composition along the direction of growth by the conventional Bridgman method. The single crystal with a uniform composition was obtained by maintaining the liquid composition content. For example, two batches of powder were prepared : one is consisted of 52 mol% of
, 30 mol% of MnO, and 18 mol% Zn(Composition A), and the other 53 mol% of
, 28.5 mol% of MnO, and 18.5 mol% ZnO(Composition B). Crack-free single crystals with the uniform composition B were grown in a size of 60mm diameter, 300mm long by melting the pellets of composition A and followed by supplying the composition B as tablets. Initial permeabilities were obtained above 600 at 5 MHz in the region of 30~270 mm along the direction of growth.
Rapid Separation and Indentification Method of Tea Catechins
Lee, Jeong-Hee ; Lee, Yong-Moon ; Moon, Dong-Cheul ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 333~338
The tea tannins, epigallocatechin, epigallocatechin gallate, were successfully separated by a Sephadex LH-20 column by the acetone based gradient elution. Each fractions was collected by monitoring at 280nm. Purified fractions were directly characterized by fast atom bombardment mass spectrometry. Epigallocatechin and epigallocatechin gallate were identified and shown as low as 70% purity in the reversed phase column. This revised method is more advantageous than known methods in purity and rapidity.
Quantitative Analysis of Lysophosphatidyl Choline (LPC) in Wheat Starch Lipids by High Performance Liquid Chromatography
Shin, Myung Gon ; Min, Bong Kee ; Chang, Pahn Shick ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 339~343
The content of lysophosphatidyl choline (LPC) in wheat starch lipids from six cultivar representing three classes of wheat was determined by a high performance liquid chromatography using UV-detection (HPLC-UV). The HPLC-UV assay had a sensitivity of LPC concentrations above
and required 80 minutes per chromatogram.
Hemodialyzer : A Low Cost and High Efficiency Concentrator
Kim, Doh Ha ; Lee, Hwang Hee ; Park, Sung Kwang ; Kang, Sung Kyew ; Park, Haeng Soon ;
Analytical Science and Technology, volume 5, issue 3, 1992, Pages 345~347