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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Analytical Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Analytical Science
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Volume & Issues
Volume 10, Issue 6 - 00 1997
Volume 10, Issue 5 - 00 1997
Volume 10, Issue 4 - 00 1997
Volume 10, Issue 3 - 00 1997
Volume 10, Issue 2 - 00 1997
Volume 10, Issue 1 - 00 1997
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A Sequential Separation Procedure for the Determination of Uranium, Thorium and Their Isotopes in Geological Materials
Kim, Jung Suk ; Choi, Kwang Soon ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 307~314
Inductively coupled plasma atomic emission spectrometry(ICP/AES) was used for the determination of uranium and thorium in geological materials. Samples were predecomposed by mixed acid digestion technique. The separation of the uranium and thorium was achieved by systematic solvent extraction with TTA(thenoyltrifluoroacetone) and TOA (tri-n-octylamine) and back extraction into HCl. The results for standard rock sample, NIST SRM 278, showed a good agreement with those certified from NIST as well as found values by other non-destructive techniques. Additional purification for extracted portions was carried out by anion exchange chromatography for measurement of several natural radioisotopes of uranium and thorium by alpha spectrometry.
A Study on the Analysis of Polycyclic Aromatic Hydrocarbons by RPLC/DAD (I)
Lee, Won ; Hong, Jee-Eun ; Park, Song-Ja ; Pyo, Hee Soo ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 315~324
The retention behaviors of 16 PAHs and 4 nitro-PAHs were studied with several parameters involved numbers of carbon atoms, F factor, aqueous solubility, L/B ratio, and numbers of interfering hydrogen atom pairs on the chemical structures of PAHs by using reversed-phase liquid chromatography/diode array detection method (RPLC/DAD) and gradient elution method. It was obtain that the log k' for most of PAHs with increasing the number of carbon and the F factor in their molecules. Chromatographic retention of PAH isomers and nitro-PAHs were examined with aqueous solubility, L/B ratio and number of interfering hydrogen atom pairs. As a result of comparison with these factors and retention times, it was found that those solutes having larger aqueous solubilities and greater L/B ratios were retained longer on stationary phase. This tendency was also occured in the molecules having the more number of interfering hydrogen atom pairs. Detection limits of PAHs which were obtained with three times measurements by RPLC/DAD were in the range of 100~500ng/mL and method detection limit(MDL) for water sample were in the range of 0.1~0.5ng/mL.
Improved Separation of Organic Explosives by Modified Micellar Electrokinetic Capillary Chromatography
Park, Sung-Woo ; Yang, Young-Geun ; Hong, Sungwook ; Kim, Taek-Jae ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 325~331
Among various CE separation methods, micellar electrokinetic capillary chromatography(MECC) method using sodium dodecylsulfate(SDS) provides rapid and accurate separation of organic explosive constituents with easy. The running buffer was composed with 2.5 mM borate and 25mM SDS(pH 8.5). Addition of 1M urea and 10% organic modifiers (acetonitrile, methanol and ethanol) improves the resolution of adjacent explosive constituents. When 15 explosive constituents were developed in MECC, most constituents were separated successively while RDX/TNB and DNN/DEP were not, and detection limits of separated compounds are in range of 1 to 4 ppm.
Determination of Organic Pollutants in Dyeing Wastewater
Yook, Keun-Sung ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 332~342
Fifteen volatile organic pollutants were spiked in blank water at the concentration of
and analyzed with Purge and Trap and GC/MS. As a result, the overall mean recovery of 100% was obtained with a mean relative standard deviation of 3.6%. The method detection limits were in the range of
. In the wastewater analysis of Banwol dyeing comlex, 15 organic compounds were identified and three of these were quantified. Among the compounds identified, only trichloroethylene and tetrachloroethylene are regulated in wastewater by the Korea Ministry of Environment. But, the concentration of these two compounds were below the government allowance level.
Analysis of Kasugamycin in Pesticide Formulations by Reversed-Phase Ion Pair Liquid Chromatography
Kim, Taek-Jae ; Kim, Kyong-Sun ; Yoon, Chae-Hyuk ; Joo, Jin-Bok ; Kim, Chung-Hyo ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 343~349
Analytical method using the reversed phase ion-pair chromatography (RP-IPC) for the determination of kasugamycin(5-amino-2-methyl-6-(2,3,4,5,6-pentahydroxy cyclohexyloxy)tetrahydropyran-3-yl-amino-
-imino acetic acid), pesticide as fungicide bactercide has been established. The retention behavior of kasugamycin in the RP-IPC was examined with respect to the effect of concentrations of organic modifiers, pH of eluent and types and concentrations of the counter ions as ion-pair reagent. This method developed by the optimum factors, can be used for the application of the quality control in the crude product and its formulation.
Development of New Separation Technique, Modifier Composition Programming in Supercritical Fluid Chromatography
Kim, Hohyun ; Pyo, Dongjin ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 350~356
Supercritical Fluid Chromatography(SFC) has been developed as an analytical technique for the compounds that is difficult to analyze by conventional chromatography. Since supercritical fluid
is difficult to elute solutes with high polarity, modified supercritical
, was used as a mobile phase. In conventional method, silica column which is saturated with modifier was used. However, with this method, we can not control the quantity of modifier. In this paper, we developed a new method which can control quantity of modifier mixed in supercritical fluid
. The quantity of
mixed was measured with amperometric microsensor which was made by perflurosulfonate ionomer(PFSI) film. we have also obtained a good supercritical fluid chromatogram of PAH mixture by use of a modifier composition programming method.
Analysis of multi-layered Surface with Glow Discharge-Mass Spectrometry
Pak, Yong-Nam ; Lee, Gae-Ho ; Kim, Hyo Jin ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 357~361
A Griemm type Glow Discharge cell is attached to a commercial quadrapole based ICP-MS and used for the analysis of surface analysis. By employing 2.0mm diameter, mode and proper experimental conditions, several layers of few
thickness are analysed within 30 minutes. Multi-layers of Cu-Ni, Fe-Ni are analyzed with the resolution of 10nm by GDMS. Proper experimental conditions make a flat bottom crater shape and good resolution for multi-layer depth profile study.
Chemometric Aspects and Determination of Sugar Composition of Honey by HPLC
Yoon, Jung-Hyeon ; Bae, Sun-Young ; Kim, Kun ; Lee, Dong-Sun ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 362~369
Chemometric technique was applied to the sugar composition in five honeys of known botanical or geographical origin following HPLC. Fructose and glucose were predominant carbohydrates in honeys, and small amount of sucrose was also detected in one sample. Sugar contents in honeys samples were compared by the geographical or botanical origin. Fructose/glucose ratio ranged from 0.99 to 1.55 was obtained and these results are in good agreement with the ratio of literature. The plot of principal components analysis(PCA) showed that different honey samples grouped into distinct cluster by the geographical or botanical origin. Increasing the first or second principal component score, higher amount of sugar or less fructose/glucose ratio was observed in PCA plot. Chemometric approach was very useful to provide pattern recognition of sugar profile or quality indices of honey sample and to detect adulteration.
Extraction Equilibria and Analytical Application of Metal-Dithizone Complexes(II) Partition and Extraction Equilibria into Chloroform
Choi, Yoon-Seok ; Choi, Hee-Seon ; Kim, Young-Sang ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 370~377
The several fundamental parameters on the solvent extraction of Co(II), Cu(II) and Zn(II) with dithizone were investigated. The value of
) between an aqueous phase and a chloroform was found to be
. And the mole ratios of metal ion to dithizone in its metal complexes were determined by mole ratio method. The extractibilities(%) for metal-dithizone chelates were obtained from the extraction equilibria of metal-dithizone complexes between an aqueous phase and a chloroform as follows. Co(II) : 92.3% at pH 8.0 : Cu(II) : 97.1% at pH 4.0 and Zn(II) : 99.0% at pH 7.0. And also, in optimum experimental conditions the extraction constants of Co(II), Cu(II) and Zn(II) were examined.
Functional analysis of Tyr7 residue in human glutathione S-transferase P1-1
Kong, Kwang-Hoon ; Park, Hee-Joong ; Yoon, Suck-Young ; Cho, Sung-Hee ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 378~385
In order to clarify the functional role of Tyr7 in human glutathione S-transferase P1-1, we extensively investigated the effect of mutation of Tyr7 on the substrate specificity and inhibition characteristics. The mutational replacement of Tyr7 with phenylalanine lowered the specific activities with 1,2-dichloro-4-nitrobenzene and 1,2-epoxy-3-(p-nitrophenoxy) propane for GSH-conjugation reaction to 3~5% of the values for the wild-type enzyme. The pKa of the thiol group of GSH bound in Y7F was about 2.4 pK units higher than that in the wild-type enzyme. The
of hematin for Y7F was similar to that for the wild-type enzyme and those of benastatin A and S-(2,4-dinitrophenyl)glutathione were only moderately decreased. These results suggest that Tyr7 is considered to be important the catalytic activities not only for GSH-chloronitrobenzene derivatives but also for GSH-epoxide conjugation reaction, rather than to binding of the substrates.
Evaluation of Quantitative Results of PIXE Analysis
Park, Jeong-Ho ; Choi, Kum-Chan ;
Analytical Science and Technology, volume 10, issue 5, 1997, Pages 386~394
The standard samples for the calibration of PIXE analysis were prepared using the single element standard samples and sulfur and chlorine compounds. The diluted standard solutions were dropped on the non-hole nuclepore film and dried. Standard sample of six elements of Ca, Cr, Co, Cu, Se and Sr had close agreement between the measurement and theoretical values. According to the theoretical study about the effects of thick samples on the accuracy of the PIXE analysis, the reduction of X-ray yields in the thick sample can not be neglected for the sample thicker than