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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 7, Issue 4 - 00 1994
Volume 7, Issue 3 - 00 1994
Volume 7, Issue 2 - 00 1994
Volume 7, Issue 1 - 00 1994
Selecting the target year
The analysis of impurities in rare earth oxide for fluorescent substance by ICP-MS
Kim, Sang-Kyoung ; Jang, Seung-Kyu ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 1~10
A survey was made on detection limit, reproducibility, matrix effect, linear dynamic range and the memory effect of yttrium and europium in order to analyze rare earth elements which exist as impurities in the rare earth oxide which is raw materials of fluorescent substance. When analysing a certain amount of thulium quantitatively using inductively coupled plasma mass spectrometry, it was found that the analysis was interfered with
which is one of polyatomic ions caused by plasma. As the intensity of thulium linearly proportional to the europium concentration, it was possible to the determine the actual concentration of thulium.
A Study On Chemical Composition of Saururaceae Growing in Korea(5) On Flavonoid Constituents of Saururus Chinensis
Choe, Koang-Hoon ; Yoon, Chun-Hee ; Kwon, Shoon-Ja ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 11~15
From the aerial parts of Saururus chinensis growing in Korea, four flavonoids (hyperin, isoquercitrin, quercitrin and rutin) were isolated and identified by high performance liquid chromatography, gas chromatography and thin layer chromatography. However, avicularin, which was known as one of the main constituents of flavonoid, was not detected.
A Study on the Charateristics of ORMOSIL as a Dye Host by Measurement of UV/VIS Spectrophotometer
Kim, Goo-Dae ; Lee, Dong-A ; Kang, Hyun-Gyu ; Moon, Ji-Woong ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 17~23
Through sol-gel process, inorganic/organic composite as a dye host was made. It was observed that this composite has about 90% of trnasmittance by UV/VIS spectrophotometer. The transmittance is the most important requirement to decide whether the composite could apply or not as the dye host. The transmittance was increased with decreasing HCl as a catalyst, aging time, and amount of PDMS. Also, fluorescent and transmittant charateristics of Rhodamine 6G Perchlorate that was doped into ORMOSIL were measured. The fluorescent intensity was increased and the trnasmittance was decreased with rising gelling temperature.
A Study on the Development of Analytical Methods and Behaviors of Environmental Pollutants(II) : Optimization for Separation of Alkylphenols by Reversed-Phase Liquid Chromatography
Lee, Dae Woon ; Lee, Yong-Ju ; Park, Young Hun ; Kim, Ho Seob ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 25~31
As for analytes which did not represent the differences of the selectivity on the stationary and mobile phase, secondary chemical equilibrium theory was applied to study pH effects on the separation of alkylphenols. Mobile phase was consisted of an aqueous sodium carbonate-bicarbonate buffer and acetonitrile. The maximum selectivity for adjacent peak pairs was predicted from those values of
. The optimum pH determined by this method was 11.18 pH and solvent selectivity were considered at the same time to invoke the full range of selectivity effects possible for separations. Quaternary mixture composed of methanol, acetonitrile, tetrahydrofuran and water was adjusted to optimum pH 11.18. As the statistical simplex technique of an overlapping resolution map (ORM) was used to predict the optimized solvent system. The optimum solvent, which gives complete separation of alkylphenols, was determined as follws MeOH : ACN : THF = 14.4 : 81.8 : 2.8.
A Study on the Development of Analytical Methods and Behaviors of Environmental Pollutants(III) : On-Line System for Preconcentration and Separation of Trace Phenols by HPLC
Lee, Dai Woon ; Kim, Jin Young ; Park, Young Hun ; Moon, Myeong Hee ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 33~39
The purpose on this study was to develop a new improved chromatographic method for determination of trace phenols from environmental waste water. The research was carried out with selected 8 phenols, and solid-phase extraction was employed as sample pretreatment method. The coupling of XAD-4 and Dowex
resin as preconcentration column increased the selectivities toward interferences coexisted in matrix. Automation was accomplished with on-line process of pretreatment and HPLC system. After elution of sample through XAD-4 column, phenols were adsorbed by dispersion force, then displaced from it by ACN basified, simultaneously and selectively readsorbed via anion exchange on Dowex
column was washed by water. Phenols readsorbed were removed from Dowex
column by a minimum volumn of methanol containing HCl. Each pretreatment step was connected by switching valves and the eluate was directly on-line injected to obtain fast and reliable results into the HPLC. Recovery of phenols was greater than 90%. To examine utility of this method, analysis of phenols from laboratory waste water sample which was added some organic pollutants to find with phenols on environmental waste water were also accomplished without their interference effects.
A Study on the Racemization of Amino acids and its Separation with GC, GC/MS and HPLC
Rhee, Jae-Seong ; Hong, Jong-Ki ; Eo, Yun-Woo ; Kim, Taek-Jae ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 41~52
The importance of separation comes from demands on study for exact effect of synthetic drugs and the reactivity of enantiomer in biological system. Racemization rate was measured under the influence of heat, acid, UV-light, enzyme(trypsin) and 6N-HCl at
on alanine, threonine, isoleucine, lecuine, aspartic acid, methionine, glutamic acid, tyrosine. The method for the identification of overlapped amino acids with GC was developed from the close study of fragmentation pattern with mass spectrometry. With cyclodextrin bonded phase by HPLC, the separation of dansyl amino acid was tested for compartison.
A Study on the Separation of Racemic Amino acids in Food or Biological Sample with GLC
Rhee, Jae-Seong ; Eo, Yun-Woo ; Park, Hyun-Mee ; Kim, Taek-Jae ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 53~64
After establishment of methodology for the separation and quantitation of optical isomer existed in food or biomaterial, the relationship between isomer and nutrient or biological sample was investigated. The optical isomers of standard amino acids and free amino acids were quantitized and the protein was assayed from the Korean bean, pasted bean, soy sauce, gochujang, powderd milk and cataract followed by hydrolysis and dervatization with TFA-IPA for GLC analysis with chirasil val column. Amino acids showing the racemization were alanine, aspartic acid, glutamic acid and phenyl alanine. The most convenient amino acid deducing age and biological activity was aspartic acid. Glutamic acid and phenyl alanine have shown poor resolution with less racemization. The ratio of d-form amino acids was 3~6% for home made pasted bean, about 3% for commerical pasted bean, 2~4% for soy sauce, about 1% for bean, 1~2% for cataract, 1.0~1.5% for powdered milk. The racemization during fermentation process was significant.
Simultaneous Analysis of Triazines and Phenoxyalkanoic Acids by GC/MS
Park, Song-Ja ; Kim, Yun Je ; Pyo, Hee Soo ; Park, Kyung Soo ; Park, Jongsei ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 65~78
The herbicide mixture of 7 triazines and 9 phenoxyalkanoic acid esters was simultaneously separated and determinated with the selected ion monitoring by using gas chromatography/mass spectrometry. The extraction recoveries of those herbicides from the reagent water were studied for the organic solvent extraction(LLE) with methylene chloride. The calibration curves of them showed good linearity over the concentration range of 0.2~0.5ng/ml and the detection limits were 0.2~0.5ng/ml for 100ml of water. This analytical method could be applied to the drinking water and biological sample.
Studies on the effect of the intermolecular hydrogen bonding on the vibrational frequencies of the acetonitrile under matrix isolation conditions at liquid-
Ma, Keum Ja ; Jeong, Jong Hak ; Jeong, Gi Ho ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 79~89
Interactions between the acetonitrile and other organic molecules such as furan, pyrrole, pyrrolidine, thiophene, tetrahydrothiophene and acetaldehyde was studied with the infrared absorption spectroscopy under matrix isolation conditions. Xe was used as a major matrix material. Acetonitrile showed strong interactions with pyrrole and thiophene, and little interactions with pyrrolidine and acetaldehyde.
CNMR Determination of Monomer Composition in EP Copolymers, EPB and EPDM Terpolymers
Lee, Kang-Bong ; An, Seong-Uk ; Rhee, Jae-Seong ; Kweon, Jeehye ; Choi, Young-Sang ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 91~102
The monomer compositions in a series of propylene heterophasic copolymer, propylene random copolymer, propylene random terpolymer and ethylene-propylene-ENB terpolymer have been determined from
spectra. The simplified and highly resolved
spectra made it possible to assign unambiguousely and calculate the monomer composition. A complete sets of NMR chemical shift assignments and the way to measure the quantity of monomer are newly given in diverse polymers. Furthermore complete dyad, triad, tetrad and pentad distributions have been able to be determined. These NMR quantitative analytical results for monomer compostition have consistent with those from Infrared spectral data.
Separation and Elution Behaviors of Some Metal-2-hydroxyarylazopyrazolone Chelates by Reversed Phase High Performance Liquid Chromatography (I)
Lee, Chang-Heon ; Kang, Chang-Hee ; Kim, Eun-Kyung ; Lee, Won ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 103~114
The elution behaviors of Ni(II), Cu(II), Co(II), and Cr(II) in 1-phenyl-3-methyl-4(2-hydroxy-5-X-phenylazo)-5-pyrazolone, [Pm(2-OH)(5-X)PaPz](X=H,
, Cl) chelates have been studied by reversed phase HPLC. Thirteen metal-[Pm(2-OH)(5-X)PaPz] chelates were prepared and characterized by UV, IR, MS, and ICP spectroscopic methods. These metal-2-hydroxyarylazopyrazolone chelates were successfully separated on Novapak-
column using methanol/water mixtures as a mobile phases. It was found that the chelates were eluted properly in an acceptable range of the capacity factor value(
). The dependence of the capacity factor(log k') on the volume fraction of water in the binary mobile phase showed a good linearity. Also, there was a good linear dependence of the capacity factor on the liquid-liquid extraction distribution ratio(
) in methanol-water/n-pentadecane extraction system by the batch method. It suggested that the retention of the chelates in the reverse phase liquid chromatographic system be largely due to the solvophobic effect.
Surface Analysis of Cold Rolled Steel Sheets by X-ray Photoelectron Spectroscopy
Lee, Do Hyung ; So, Jae Choon ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 115~124
The corroded surface of cold rolled steel sheet in the process of rinsing after alkali-cleaning was examined by means of X-ray Photoelectron Spectroscopy(XPS). In addition, the surface-treated cold rolled steel with 0.05wt%
solution for the purpose of preventing the corrosion was examined by means of XPS and the results were compared with those for the non-treated cold rolled steel. It was found that the corroded surface consists of
, FeO and
and the thickness of the oxide layer is about
. On the other hand, in the case of surface-treated cold rolled steel, the phosphate layer of
thickness was found to act as a protective film over the relatively thin Fe oxide layer.
A Study on the Analysis of Volatile Flavour of Kimchee
Hawer, Wooderck S. ;
Analytical Science and Technology, volume 7, issue 1, 1994, Pages 125~132
Flavours in kimchee are the result of unique combination of various sugars, organic acids and amino acids as well as various volatile organic compounds including sulfur-containing compounds, terpenes, alcohols, and some volatile organic acids. In the experiment for the flavour extracting methods, dynamic headspace(DHS) is more effective for collection of volatile flavour than simultaneous distillation extraction(SDE). The best polarity available at the moment is 5% phenyl methyl poly-siloxane which will separate non-polar, intermediate and polar components with good resolution.