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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 7, Issue 4 - 00 1994
Volume 7, Issue 3 - 00 1994
Volume 7, Issue 2 - 00 1994
Volume 7, Issue 1 - 00 1994
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A Study on the Analytical Characterizations of the Low Flow-Low Power ICP-AES
Yang, Hae Soon ; Kim, Young Man ; Kim, Sun Tae ; Choi, Beom Suk ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 253~260
Analytical characteristics of low power-low flow inductively coupled plasma-atomic emission spectometry(ICP-AES) has been studied. Although the net intensity of the low power ICP is lower than the moderate power ICP, the signal to background ratio becomes higher since the background intensity decreases with decreasing the RF power. The detection limit of the low power ICP is comparable with that of the moderate power ICP. The dynamic range of the calibration curve of the low power ICP is
. The ionization interferences by alkali metals increase with increasing the carrier gas flow rate, but the effects are not varied significantly with the RF power.
Spectrophotometric Determination of Trace Amount of Sulfide by Formation of Iodide and Its Solvent Extraction with Mehtylene Green
Kam, Sang-Kyu ; Kim, Kyung-Youn ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 261~269
The iodide formed stoichiometrically for sulfide by its oxidation with iodate was extracted as an ion-pair with methylene green into 1,2-dichloroethane and the extract was measured spectrophotometrically at 656nm for the determination of sulfide. Hydrogen sulfide separated from the sample matrix was introduced into a solution containing pH 3.5 acetate buffer and iodate, in which the hydrogen sulfide was completely converted into iodide. A linear calibration graph was obtained over the range
) and the detection limit was
. The apparent molar absorptivity and a correlation coefficient(r) were
and 0.999, respectively. When applied to the stream water samples, the proposed method gave a relative standard deviation of 1.59% at
Adsorption Behavior of Metal ions by Na-Cellulose
Lee, Tack-Hyuck ; Yoon, Koog-Joong ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 271~276
A Na-cellulose adsorbent was prepared by treating Sigma S-5504 cellulose with 2M NaOH and examined the adsorption behavior between metal ions and Na-cellulose in aqueous solution with batch method. Considering ion exchange capacity of Na-cellulose, the adsorption ratio of the Na-cellulose to metals charge equivalent indicated that the adsorption result from ion exchanging between metal ions and Na-cellulose. The enthalpy for the metal adsorption on the Na-cellulose was calculated to -18kcal/mol, which value was compared to those of carboxymethylcellulose(CMC) and Dowex 50W-X8, these result suggested that the adsorption on Na-cellulose resulted from ion exchange adsorption.
Study on the Spectrophotometric Determination of Rare Earth by Ternary Complex Using Xylenol Orange and Surfactant
Cha, Ki-Won ; Park, Chan-Il ; Kang, Sun-Hee ; Chang, Byung-Du ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 277~284
The spectrophotometric determination of rare earth elements with XO was investigated in the presence of cetylpyridium chloride(CPC), dodecyltrimethylammonium bromide(DTMAB), cetyltrimetylammonium bromide (CTMAB), Triton X-100 at pH 6.2. The complex between XO and rare earth elements in the presence of cationic surfactants was very stable and more sensitive than in the absence of surfactants. The largest absorbance increase was provided by CTMAB, which was therefore chosen for determination of rare earth elements. REE-XO-CTMAB complex has absorption maxima at 618nm and obeys the Beer's law in the range of 0~0.5 ppm. Molar absorptivity was
Development of Assembly for Fast BOD Estimation and Its Applications
Soon, Moo-Jeong ; Kim, Eun-Jeong ; Jang, Seh-Yong ; Hong, Daeil ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 285~291
A microbial BOD sensor for the continuous estimation of BOD was been developed by immobilizing Trichosporon cutaneum, which was immobilized between a dialysis and a gas-permeable membrane, on an oxygen electrode. The optimum pH and temperature for BOD measurement using this sensor were pH 7.0 and
, respectively. The best result was obtained at 2~3ml/min flow rate in 0.1M phosphate buffer solution. A linear relationship was observed between
and the concentration of standard GGA solution below 60mg/l(90ppm
). The reproducibility was found to be within 3% for the standard solution containing glucose 30mg/l and glutamic acid 30mg/l. The output DO value of this sensor was almost constant for 30 dalys. The response time and the recovery time were about 5 and 10 min, respectively. This sensor was employed for the BOD measurement of waste pollutants and was compared with
A Classification of Korean Ancient Coins by Neutron Activation Analysis
Chun, Kwon Soo ; Lee, Chul ; Kang, Hyung Tae ; Lee, Jong Du ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 293~299
Fifty ancient Korean coins originated in Choson period have been determined for 11 elements such as Sn, Fe, As, Au, Co, Sb, Ir, Os, Ru and Ni by destructive and non-destructive neutron activation analysis as well as for 3 elements such as Cu, Pb and Zn by atomic absorption spectroscopy. The multivariate data have been analyzed by principal component mapping method. The spread of sample points in the eigenvector polt has been attributed to common origins of some elements.
Surface Analysis of Modified Polymer Samples by X-Ray Photoelectron Spectroscopy and Rutherford Backscattering Spectroscopy
Park, Sung-Woo ; Kim, Dong-Hwan ; Kim, Young-Man ; Park, Byung-Sun ; Han, Wan-Soo ; Suh, Bae-Suk ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 301~313
X-Ray Photoelectron Spectroscopy(XPS) and Rutherford Backscattering Spectroscopy(RBS) are used for the analysis of additives, examination of chemical structure and determination of identity with qualitative and quantitative analysis of surface elements, binding energy level and depth profiling in the surface. We analyzed surface of polyethylene, acrylonitrile butadien rubber, polypropylene, glass, fiber and paper treated with
or C-F plasma by XPS and RBS. It was found that fluoro element was penetrated to sample surface and the distribution of surface elements are different than untreated samples.
Synthesis and Characterization of Li-Graphite intercalation Compounds
Oh, Won-Chun ; Kim, Myung-Kun ; Ko, Young-Shin ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 315~320
Li-GICs as a high performance energy storager were synthesized as a function of the Li content by the admixture and add-pressure method. The characteristics of these prepared compounds have been determined from the studies by X-ray diffraction, UV-VIS spectrometry and CHN analysis. It follows from the results of X-ray diffraction that the lower-stage intercalation compounds are formed as the Li contents increase, however the mixed stages in these compounds are also observed. In the case of the
, the compound with the structure of stage 1 has been predominently, but the structure of only stage 1 is not obtained. The
value of stage 1 was determined to be ca.
. An analysis of spectrometric data shows that each of the compounds gives distingushible energy state spectra. It is seen from the spectra that the positions of
values, with increase in the Li contents, are shifted in the region of higher energy state. Such a result can be attributed to the formation of stable stages. The results of CHN analysis allow us to find the mixing state related to chemical compositions of the intercalated compounds and the superiority to admixture and add-pressure method. From the results determined, it reveals that
-GIC can be utilized for an anode of rechargable battery.
Reaction and Characterization of Silylene and its Precusor
Kong, Young Kun ; Ahn, Young Man ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 321~327
The mild thermal decomposition of 7, 7-dimethyl-1, 2, 3, 4, 5-pentaphenyl-7-silanorbornadiene with excess methyl alcohol proceeds to give 1-methoxydimethylsilyl-1, 2, 3, 4, 6-pentaphenylcyclohexa-2, 5-diene which is colorless needle crystal. The cophotolysis of the solution of 7-silanorbornadiene in the excess ethyl alcohol proceeds with loss of silylenes to give ethoxydimethylsilane which is insertion reaction product of silylene with O-H bond of ethyl alcohol. According to above results, it is presumed that the mechanism of photochemical decomposition and that of mild thermochemical decomposition of 7-silanorbornadiene are different.
Retention Behaviors of Natural Gas Components on a Single Column by Gas Chromatography
Choi, Yong-Wook ; Choe, Kun-Hyung ; Lee, Dai-Woon ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 329~338
The retention behaviors of natural gas components were studied on a single column by gas chromatography. The dead time,
was obtained by using extrapolation of homologous series to determine capacity factors. The plots of retention data for homologous series and carbon number at different temperatures were shown to converge into a single point, which point was determined as a dead time. The results of the effect of temperature on the column efficiency for n-butane exhibited the plate number, N incerased with temperature, but the resolution among the fast eluted components decreased. The adsorption enthalpy (
) for each component on 28% DC 200 stationary phase was determined, and in order to investigate the retention behaviors of natural gas components the regression analysis of log
, log k' and log
vs. van der Waals volume(Vw), molecular connectivity index(X) and hydrophobic fragmental constant(f) were carred out. Good correlation was found between log k' vs. Vw, and log k' vs. f. The correlations between the physical properties of natural gas and the physical parameters were investigated by the linear regression analysis. The relationships between Vw vs. molecular weight and heating value(
), X vs. boiling point, and f vs. molecular weight, boiling point and heating value exhibited the high correlation coefficient more than 0.99. Using the regression equation between the heating value of natural gas and Vw the predicted heating values from
showed good agreement with those reported in the literature within 0.2% relative error.
Determination of Natural Gas Components by Gas Chromatographic Multicolumn System
Choi, Yong-Wook ; Choe, Kun-Hyung ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 339~347
A multicolumn system consisted of two valve(10-port and 6-port valve)-three column (28% DC 200, SP 1700 and Chromosorb 102 column) was developed. Nine natural gas components composed of
completed all the baseline separation within 18 minutes. The accuracy and the precision of this system was tested. The retention times and the peak areas were determined with a repeatability between 0.02 and 0.16%, and less than 1%, respectively. Calibration curves for natural-gas components were plotted by the partial pressure injection method of pure gases, and good linear relationships for each component were presented. By using these calibration curves the accuracy of the multicolumn system compaired with that of the single column system for a certified standard gas of natural gas. As a result, relative error in the single and the multicolumn system was less than 0.5% and 0.04%, respectively. The result of application of this system in the analysis of importing LNG composition showed that the heating values calculated by the multicolum system were estimated lower compared with those calculated by the single column system and consequently, the importing price of LNG was able to be cut down.
Determination of Sulfur-Containing Odorants in Natural Gas by Gas Chromatography/Flame Photometric Detection
Choi, Yong-Wook ; Kim, Jong-Hun ; Choe, Kun-Hyung ; Shin, Sung-Sik ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 349~359
A gas chromatographic method for analyzing the gas odorants concentration in natural gas was studied. Eight odorants involving TBM and THT were completely separated by using OV-10 column. The optimization of several interrelated key parameters affecting the response of FPD such as hydrogen flow rate, air flow rate and detector temperature were accomplished. A permeation device was used to obtain calibration curves of TBM and THT. This analytical method has applied to measure TBM and THT used as a natural gas odorant blend in natural gas pipeline. In order to elucidate the relationship between odor level and odorant level feasibility test of fragrance meter was demonstrated.
Electrochemical Behavior of Light Lanthanide Ions in Nonaqueous Solution, Flow Injection Determination and Photochemical Characterization of Eight Coordinated Chelates of Heavy Metal Ions (Part I) Electrochemical Behavior of Light Lanthanide Ions in Nonaqueous Solution
Kang, Sam-Woo ; Pak, Chong-Min ; Do, Lee-Mi ; Song, Myoung-Kyu ; Kim, Il-Kwang ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 361~369
Voltammetric behavior of some light lanthanide ions(
) in acetonitrile(AN) and dimethylformamide(DMF) has been investigated by direct current, differential pulse polarography and cyclic voltammetry. The reduction of
in 0.1M TEAP proceeded directly to the metallic state through three-electron charge transfer of irreversible process where as
proceeded by charge transfer of two steps. As the results of the cyclic voltammetric investigation, the first step reduction of
were a quasireversible reaction, the second step reductions were an irreversible reaction. The cathodic peak currents of the differential pulse polarogram showed adsorptive properties at lower sweep rates and high concentrations of these metal ions. The peak potenital was shifted to a negative petential and the peak current decreased with the increase of percentage of water in AN. On the other hand, the peak potential was shifted to a positive potential and the peak current decreased with an increased percentage of water in DMF.
Study on Characterization of Galvanic Oxygen Sensor
Cho, Dong-Hoe ; Park, Myon-Yong ; Lee, Byoung-Cho ; Chung, Koo-Chun ; Park, Jongman ; Lee, Kyeong-Jae ; Chung, Sung-Sook ; Park, Sun-Young ; Lee, Kwang-Woo ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 371~378
The detection range of this galvanic oxygen sensor for oxygen concentration was 0.0% to 20.0%. By using gold or silver as cathode, reproducible response time and sensitivity to change of oxygen concentration were observed. The anode was Pb-Sn-Ca alloy. Oxygen selective permeable membrane was hydrophobic and porous Teflon film. The effect of the membranes varying in thickness have been studied on the temperature(
) and relative humidity(R. H 0~99%). Lead acetate buffer solution as the electrolyte has shown a high output voltage and longer life.
The Elution Behaviors of Some Metal-2-Hydroxy-arylazopyrazolone Chelates by Reversed Phase Liquid Chromatography (II)
Lee, Won ; Kim, In-Whan ; Kang, Chang-Hee ; Kim, Eun-Kyung ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 379~386
The elution behaviors in reversed-phase liquid chromatography were investigated thermodynamically for 2-hydroxy-arylazopyrazolone chelates with Ni(II), Cu(II), Co(III), Cr(III) on Novapak
column. There was a good linear dependence of the capacity factor(k') on the variations of column temperature in van't Hoff plot. From this result, it was confirmed that the retention mechanism of these chelates in the reversed phase liquid chromatography system was invariant under the condition of various temperatures. For the most cases of the chelates studied, the dependence of capacity factor(1n k') on enthalpy
, calculated by van't Hoff plot showed a good linearity(r=0.980~0.999) except [Pm(2-OH_(5-Cl)PaPz](r=0.787) and also the compensation temperatures(
) showed constant values. The range of compensation temperature values calculated from the slope of
vs 1n k' plots was 374.3~806.9K. It was suggested that the retention of metal-2-hydroxy-arylazopyrazolone chelates in the reversed phase liquid chromatography system was largely affected by the hydrophobic effect.
Study on the extraction mechanism and the optimization of extraction method for Chromium using anion exchangers
Kim, S.W. ; Kim, D.M. ; Kim, Y.S. ; Lim, H.B. ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 387~393
Quantitative analytical conditions for chromium using solvent extraction followed by atomic absorption spectrometry was studied. Trioctylamine(TOA) in tertiary amine or Trioctylmethylammoniumchloride(TOMAC) in quaternary ammonium salt, both containing octyl group was used as an anion exchangers. Absorbance were measured for the different kinds of acid added and as changing the concentration of acid by graphite furnace atomic absorption spectrometer. The maximum absorbance was obtained at the concentrations of HCl, 0.1M to 0.3M for TOA and 0.03M to 0.1M for TOMAC. Mole ratios over 1:1 of TOA or TOMAC dissolved in MIBK solution to chromium in sample shows optimum extraction efficiency while HCl was added to the MIBK. As a result of scrutinizing the extraction process, the methods employed in this experiment turned out to be better extraction efficiency for chromium, compared to similar extraction methods.
DEVELOPMENT AND COMPARISION OF RESIDUE ANALYSIS FOR BENOMYL IN BEAN AND BEAN SPROUTS
Han, Ilkeun ; Chai, Jeungyoung ; Lee, Jayoung ; Yeo, Ikhyun ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 395~402
Benomyl(Methyl-1-(Butyl Carbamoyl)-Benzimidazole-2-yl-Carbamate) is widely used as pre- and post-harvest pesticide. It converts into MBC(Carbendarzime:Benzimidazole-2-yl-carbamate) and butyl-isocyanate in mild condition. In this study, three analytical methods for MBC were compared in view of detectability, correctness, and sensitivity. The first and second are HPLC analytical method employing the UV detection of MBC. Our new third method was modification of PFBB(pentafluoro-benzylbromide) derivatization method with GC-ECD & MSD. The average recoveries and detection limit of MBC in the newly modified method are 95% and
in whole bean and bean sprouts respectively. This new method prevent pesticide analysis from misdetecting in bean and bean sprouts.
SEPARATION, IDENTIFICATION OF BIOACTIVE COMPOUNDS FROM ALFALFA PLANT
Chung, Ill-Min ; Kim, Ki-June ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 403~411
To isolate, purity and identify of bioactive compounds involved in alfalfa allelopathy and/or autotoxicity, experiment was conducted. Isolation and separation procedures used from an 80% methanol extract of fresh alfalfa leaves(1kg), silica gel thin layer chromatography(TLC), followed by Droplet Counter Current Chromatography(DCCC). Preliminary identification was examined by high preformance lipid chromatography(HPLC). Four phenolic compound, salicylic acid, scopoletin, rutin, and quercetin, were identified and identified all compounds were phytotoxic to alfalfa seed germination and seedling growth. Among these compounds, quercetin treatment(
) was most inhibitory to alfalfa seed germination and seedling growth. These compounds may be, at least in part, involved autotoxicity and allelopathy.
Microanalysis of Vecuronium Bromide in Biological Fluids by Spectrofluorimetry and HPLC-Fluorescence Detection
Ko, Yong-Seok ; Han, Sang-Soo ; Shin, Tae-Yong ; An, Nyeon-Hyoung ; Ock, Chi-Wan ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 413~419
The determination of the neuromuscular blocking agents vecuronium bromide(VeBr) in biological fluids has been investigated. The method depends on the formation of insoluble red complex between vecuronium bromide and rose bengal in aqueous layer. The amount of vecuronium bromide was calculated from that of extracted rose bengal which was determined by spectrofluorimetry or HPLC/fluorescence detection method. It was possible to analyze VeBr in the range of
(r=0.998 for water soln., 0.999 for urine, 0.996 for plasma). This method was applied to the analysis of VeBr in biological fluids, urine and plasma.
Analysis of Carbendazim and Carbaryl by Micro-HPLC
Choi, Kyoung-Sook ; Lee, Hoe-Yeon ; Lee, Duck-Hee ; Byun, Woon-Ki ;
Analytical Science and Technology, volume 7, issue 3, 1994, Pages 421~425
A micro-high performance liquid chromatography(Micro-HPLC) techniquie with solid phase extraction was reported which detected carbendazim and carbaryl at picogram levels. They were separated on microbore packed
) using a 50% methanol mobile phase and detected at UV 220nm(
), while they were not resolved on analtical HPLC system(
). The detection thresholds of carbendazim and carbaryl were 0.5ng and 0.1ng on Micro-HPLC, therefore Micro-HPLC system was 20~40 told more sensitive than anayltical HPLC system. Sep-Pak
catridge was found to be efficient in enriching carbendazim and carbaryl from dilute aqueous solution with 97.0% and 97.8% recoveries of them. The Sep-Pak
catridge followed by the Micro-HPLC had been applied to the quantitative analysis of carbendazim and carbaryl in spiked juices and a commercial drinking water.