Go to the main menu
Skip to content
Go to bottom
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
Editor in Chief :
Volume & Issues
Volume 17, Issue 6 - 00 2004
Volume 17, Issue 5 - 00 2004
Volume 17, Issue 4 - 00 2004
Volume 17, Issue 3 - 00 2004
Volume 17, Issue 2 - 00 2004
Volume 17, Issue 1 - 00 2004
Selecting the target year
Determination of oxymatrine in Sophora Radix by High Performance Liquid Chromatography
Yang, Seung Kwon ; Yun, Young Ja ; Namgung, Mi Ok ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 289~294
A high performance liquid chromatographic method was designed for the quantitative analysis of oxymatrine in Sophora Radix. The separation of oxymatrine was performed by reversed-phase chromatography with a
column and a buffered aqueous solution containing acetonitrile, and monitored by UV absorption at 215 nm. Extraction of oxymatrine in Sophora Radix was carried out using various solvents and extraction methods. The optimum extraction efficiency for the crushed Sophora Radix was achieved by reflux at
in 50% ethanol for five hours. Most extraction methods used to complicate pretreatments. In this study, sublimation was employed for a extraction method without going through complicate pretreatments. Sublimation was carried out under high vacuum (
torr) and at high temperature (
). Extraction efficiency using Sublimation was found to be inferior to other extraction methods.
Comparison of Static and Dynamic Solvent Extraction of Polychlorinated Dibenzofurans from Fly Ash
Yang, Jeong Soo ; Jeong, Jang Hwan ; Yu, Euy Kyung ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 295~301
In this study, static and dynamic solvent extractions are compared for more efficient extraction of polychlorinated dibenzofurans (PCDFs) from fly ash. Static solvent extraction rather than dynamic extraction showed a higher recovery of PCDFs, which was adsorbed strongly with fly ash. The effects of parameters, such as temperature, toluene-isopropyl alcohol mixture, static and dynamic time flow rate, and solvent volume on the extraction were investigated and the variations in average recoveries of PCDFs were explained. In both extractions, temperature was an effective parameter because the higher temperature gave the higher recoveries. In dynamic solvent extraction, dynamic time was more effective than flow rate and solvent volume for the extraction of PCDFs from fly ash. Multi-layer column chromatography on neutral and acidic silica gel with n-hexane was used for cleaning up the extracts. The quantification of the PCDFs extracted was performed using HPLC-UV.
Determination of trace actinide (Am, Pu, Th, U) using alpha spectrometry and neutron activation analysis
Yoon, Yoon Yeol ; Lee, Kil Yong ; Cho, Soo Young ; Kim, Yongjai ; Lee, Myong Ho ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 302~307
Determination of actinides in the environmental sample requires separation of each element. This procedure is tedious and time consuming. And also, the detection limits of some nuclides using alpha spectrometry are rather higher. To overcome the lower detection limit and complicated separation procedure, a simple analytical technique for the determination of actinide isotopes in the environmental samples was developed and applied to IAEA and NIST reference sediment samples. For the separation of actinides from matrix, anion exchange resin and TRU-spec extraction chromatography resin were used and chemical yields were obtained using natural uranium, thorium,
tracers. For overcoming the higher detection limits of U and Th in alpha spectrometry, neutron activation analysis was applied. Using combined method, the detection limit was increased about 10 times. The activity values of each isotope were consistent with the reference values reported by IAEA and NIST.
Trace impurities analysis of the electronic polymer resins by neutron activation analysis
Yoon, Yoon Yeol ; Cho, Soo Young ; Lee, Kil Yong ; Yang, Myung Kwon ; Shim, Sang Kwon ; Chung, Yong Sam ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 308~314
When the polymer was used for the guard raw materials of electronic device, the content of U, Th and their daughter nuclides were known as a factor of soft error. Because emitted alpha ray could be caused of mis-operation. And ionic impurities such as Cl, Fe, Na could shorten the device life-time. For the analysis of trace impurities in the polymer, neutron activation analysis(NAA) and ICP/AES have been studied. To improve the accuracy and sensitivity of the trace and ultratrace metallic impurities in the epoxy and phenol polymer, sample pretreatment method and optimum analytical condition of NAA were developed. Using the above method, U, Th and other 23 trace impurity elements were analyzed.
The classification of ballpoint pen inks in Questioned Documents by using VSC and SERRS
Kim, Nam Yee ; Park, Sung Woo ; Doble, Philip ; Roux, Claude ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 315~321
The aim of this study was to investigate the evidential value of blue and black ballpoint pens on paper by nondestructive techniques. In this work, 21 blue and 22 black ballpoint pens which were purchased on different brands were analyzed by Raman Spectroscopy and Video Spectral Comparator (VSC). Surface-Enhanced Resonance Raman Spectroscopy (SERRS) with excitation at 685 nm and VSC with several spot light filters were used for the discrimination of ballpoint pen inks. In the SERR spectra, the ballpoint pen inks on paper could be shown sharp spectral bands and distinguished by their band shapes and relative intensities. In the blue and black ballpoint pen inks, the discriminating powers (DP) by SERRS were 0.85 and 0.67 and the DP by VSC were 0.88 and 0.90, respectively. The DP by combined sequence of techniques was all 0.97 in both black and blue ballpoint pen inks.
A study on the derivatization technique for tamoxifen metabolites in human urine by gas chromatography/mass spectrometry
Kim, Yunje ; Lee, Yoonjung ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 322~336
The improved derivatization technique of tamoxifen metabolite in human urine is described for the acylation method that they are substituted by derivatization reagent like acyl anhydride for use of gas chromatography/mass spectrometry. The hydroxyl group of tamoxifen metabolite was derivatized by trifluoroacetic anhydride (TFAA), pentafluoroacetic anhydride (PFPA) and heptaflorobutylic anhydride (HFBA). It was investigated to the gas chromatography/mass spectrometry (GC/MS) technique use negative ion chemical ionization (NCI), positive ion chemical ionization (PCI) and electron impact (EI). In acylation of the metabolites of tamoxifen, the effective reaction temperature and time were shown to be at
for 30 min. The 4-hydroxytamoxifen, which is known to major metabolite of tamoxifen, was not detected in human urine, whileas the hydroxymethoxytamoxifen was detected. We thought that this result was from the single dose of tamoxifen.
A study of the metabolites for 7-keto-DHEA-acetate in human urine
Kim, Yunje ; Lee, Jinhee ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 337~346
7-keto-dehydroepiandrosterone-acetate (7-keto-DHEA-acetate) is an anabolic steroids, and we studied basically to the metabolites of it after human dosing. We tested the matrix effect from human urine to detect the 7-keto-DHEA-acetate. And LC/ESI/MS and GC/MSD was used to detect the metabolites in dosed urine. We found the some unknown compound from dosed urine (M1, M2, M3, M4 and M5), and from these results, we supposed that these compounds have the more than 3 hydroxyl and/or ketone group. Metabolite M1 was supposed that molecular weight is 302 and 3-,17-diketone and 7-hydroxyl compound (7-OH-androstendione). Metabolite M2 was supposed that the molecular weight was same to M1 and 7-,17-diketone and 3-hydroxyl compound (7-keto-DHEA).
Accumulation Levels and Distribution Characteristics of Polychlorinated Biphenyls in Crucians and Leopard Frogs from the Nakdong River Basin
Moon, Ji Yong ; Lee, Sung In ; Song, Heeyoung ; Lee, Kyoung Jin ; Choi, Kyunghee ; Jeong, Gi Ho ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 347~354
We collected crucians (Carassius auratus) and leopard frogs(Rana pipiens) along the Nakdong River and the basin area at five locations from Koomi to Nakdong-estuary. The muscular tissue were separated and a GC-MSD system was used for quantification of PCBs. The 62 PCB congeners which represent total PCB levels were selected as analytes. We determined concentrations of PCBs and studied distribution characteristics by individual congeners and homologs. In the crucian, 24 congeners were detected and total PCB levels ranged from 0.74 to 5.41 ng/g wet weight. In the leopard frog, however, only 2 congeners were detected from Nakdong estuary only. The PCB level was 0.24 ng/g wet weight, around 22 times lower than the crucians. The PCB 153 showed the highest concentrations in the congeners and penta- and hexa-CBs showed the strong predominance which accounted for 78% of the total PCBs.
EPMA Analysis of Inter-reaction Layer in Irradiated U
Jung, Yang-Hong ; Yoo, Byung-Ok ; Kim, Hee-Moon ; Park, Jong-Man ; Kim, Myung-Han ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 355~362
Fission products and Inter reaction layer of
dispersion fuel, irradiated in HANARO research reactor with 121 kW/m of maximum liner power and 63 at% of average burn-up, was characterization by EPMA (Electron Probe Micro Analyzer). The fuel punching system developed by Irradiated Materials Examination Facility (IMEF) has used to make these samples for the EPMA. With this system a very small and thin specimen which is 1.57 mm in diameter and 2 mm in thickness respectively has been fabricated to protect the EPMA operator from high radioactive fuel and to mini-mize the equivalent dose rate less than 150 mSv/h. EPMA was performed to observe layers of sectional, Inter-reaction and oxide with specimens of cutting and polished. Stoichiometry in the Inter-reaction layer with
of thickness was
with calibration of
with calibration of standard specimen. metallic precipitates in this layer were not observed using fission products examination.
Determination of Heavy Metal in Polyurethane by New Digestion Method and ICP-AES
Lim, Heon-Sung ; Lee, Sueg-Geun ;
Analytical Science and Technology, volume 17, issue 4, 2004, Pages 363~367
A simple and convenient digestion method was developed for the determination of heavy metal in polyurethane sample using only nitric acid in open system without heating. This digestion method had prevented loss of volatile elements of Hg and As and reduced the pretreatment time for the sample digestion. The detection limit is lowered over 10 times than that of microwave digestion method. Recoveries in polyurethane material were 108% for As, 96 ~ 99% for Hg, 102 ~ 103% for Cr, 98 ~ 102% for Pb, 86 ~ 90% for Cd, and 90 ~ 93% for Cu.