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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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Analysis of Lead in Blood using SR(self-reversal) and
Arc Background Correction Methods
Lee, Seokki ; Kim, Poongzag ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 427~434
For the analysis of the relatively volatile lead in blood by GFAAS(graphite furnace atomic absorption spectrophotometer), one can not raise the ashing temperature beyond certain degree due to the elevation of the baseline. Previous investigations showed that background is stabilized when the ashing temperature is raised to
using a matrix modifier. In this study, same result was obtained at the ashing temperature of around
even when the matrix modifier is not used and only Triton X-100 is used as a diluent, on an instrument which is equipped with both temperature and current controller(Shimadzu, AA-6501S) and thus the temperature control is fast and accurate. Background correction methods of
arc and SR(self reversal) were reviewed. The results show that the absorbance is higher for the
arc method, but the background correction is higher for the SR method.
Analysis of the Anionic Surfactants by Capillary Electrophoresis
Jeong, Hyuk ; Kim, Seung Sun ; Lee, Byung Min ; Kang, Ho-Cheol ; Lee, Won ; Kim, Hai-Dong ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 435~440
Qualitative and quantitative analysis for the anionic surfactants used in the metal washing fluid (brand names are BFA and BCA) was performed by the capillary electrophoresis. Acetonitrile and sodium benzoate were mixed with the buffer solution which controlled at pH 10. Under the 18kV applied voltage, the electropherograms have shown the theoretical plates more than
. Determined as the concentration at the S/N~3, the typical detection limit was ~5 ppm and the calibration curves have shown the correlation coefficients higher than ~0.99. Based on these results, it was concluded that each components were octanoate, decanoate, dodecanoate, tetradecanoate, hexadecanoate and the relative ratio was 1.0 : 1.0 : 6.5 : 2.1 : 0.8 for the BFA.
Comparison of Liquid-Liquid Extraction and Solid-Phase Extraction Coupled with GC/MS for Determination of Priority Pollutants in Water
Yook, Keun-Sung ; Hong, Sa-Moon ; Kim, Jong-Ho ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 441~453
Two extraction methods, liquid-liquid extraction(LLE) and solid-phase extraction(SPE), coupled with GC/MS were compared as preconcentration procedures for priority pollutants in water. Among the semi-volatile priority pollutants, 11 acid and 44 base/neutral compounds were spiked in reagent water. With LLE, which is a modification of EPA Method 625, the overall mean recovery of the 54 compounds was 91% with a mean relative standard deviation(RSD) of 4.6%. With SPE, the overall mean recovery of the 52 compounds was 53% with a mean RSD of 8.9%. The detection limits of both methods were in the range of
Extraction-Spectrophotometric Determination of Mercury(II) using Nicotinaldehyde-4-phenyl-3-thiosemicarbazone
Lee, Jin-Sik ; Uesugi, Katsuya ; Choi, Won-Hyung ; Kim, Jae-Soo ; Kim, Do-Hoon ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 455~460
A selective extraction-spectrophotometric method for the determination of mercury(II) with nocotinaldehyde-4-phenyl-3-thiosemicarbazone(NPS) was described. The method is based on the formation of an insoluble mercury-NPS complex, which is extratable into chloroform from an aqueous solution at pH 3.5 by shaking for 3 min. The absorbance is measured at 365nm and the molar absorptivity is
. The complex system conforms to Beer's law for up to
of mercury(II). The proposed method is simple and selective and has been satisfactorily applied to the determination of mercury in standard human hair sample.
Determination of Vanadium with N-Benzoylphenylhydroxylamine by Adsorptive Stripping Voltammetry
Choi, Sung Yung ; Choi, Won Hyung ; Lee, Jin Sik ; Lee, Sang Hoon ; Lee, Yeong Sig ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 461~469
Trace vanadium was determined by Adsorptive stripping voltammetry with HMDE in PIPES buffer solution. N-Benzoylphenylhydroxylamine was used as a ligand. The calibration curve of vanadium was linear over the range of
on accumulation potential of +0.15V and on accumulation time of 10 sec. The various metal ions did not interfere with the determination of vanadium(V) in this case.
Measurment of Gold Coating Thickness by PIXE
Kim, N.B. ; Woo, H.J. ; Kim, Y.S. ; Kim, D.K. ; Kim, J.K. ; Choi, H.W. ; Park, K.S. ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 471~476
The capability of PIXE (Proton Induced X-ray Emission) method for the precision measurement of coating thickness has been tested by measuring several gold coated copper plates. Two different experimental methods are applied and compared. The results are compared with those by the weight measurement and proton RBS (Rutherford Backscattering Spectrometry). The advantage of the method is that it can be also used for the nondestructive thickness measurement of this layers on large-scaled samples or archeological samples which cannot be placed in a vacuum chamber.
Current, flow rate and pressure effects in a Gas-Jet-assisted Glow Discharge source
Lee, Gaeho ; Kim, Dongsoo ; Kim, Eunhee ; Kang, Seongshik ; Park, Minchun ; Song, Haeran ; Kim, Hasuck ; Kim, Hyojin ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 483~492
Direct solid analysis of various kinds of metal samples has been conducted by glow discharge. In this laboratory, the gas-jet assisted glow discharge(GJGD) device has been developed and characterized. The effect of changes in applied current, cell pressure and flow rate on atomic emission signals obtained from a jet-assisted cathodic sputtering was investigate. The emission intensities of Cu, Zn, and Ar were measured. They were increased with the current. But the intensities were decreased by increasing the flow rate of argon due to the diffusion and transportation of particles into plasma. By increasing the pressure of the cell, the intensities were greatly decreased because of enhancement of redeposition onto the surface of the sample.
Nb-carbonitride Analysis Techniques in Nb-steels
Lee, J.J. ; Jung, S.W. ; Yoo, K.S. ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 493~504
The morphology and structure of precipitates of formed in Nb steels were investigated using SEM, TEM and XRD. The quantitative analysis of the precipitates was performed by ICP-AES. The potentiostatic etching method was employed as an extraction method using 10% AA-methanol and 15% Na-citrate electrolytes. The two selected potentials relative to SCE(Standard Calomel Electrode), -100mV in 10% AA-methanol solution and -250mV in 15% Na-citrate solution were found to be effective for the extraction. XRD analysis showed that composition of Nb carbonitride in Nb-steel(0.01% C-0.7% Nb-0.004N) was
NMR Study of mono-and di-cyanide ligated Hemin Complexes as Models of Hemoproteins
Lee, Kang-Bong ; Kim, Nam Jun ; Kweon, Jeehye ; Rhee, Jae-Seong ; Choi, Young-Sang ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 505~515
NMR spectra for monocyanide ligated ferriprotoporphyrin(hemin) complex and dicyanide coordinated hemin complex in dimethylsulfoxide(DMSO-
) solution have been recorded and analyzed. NMR spectra of hemin-cyanide complexation in DMSO-
exhibit that the cyanide ligation to hemin is temperature-dependent. Thermodynamic parameters for the monocyanide ligated hemin to dicyanide ligated hemin are consistent with endothermic process with
. Detailed analysis of the anomalous deviation from Curie behavior for CN/DMSO coordinated hemin complex demonstrates the presence of a high spin character, and this weaker axial field relative to the purely low-spin dicyanide hemin complex is supposed to attribute to instantaneously ruptured iron-DMSO bond. This complex may serve as a useful model to characterize electronic/molecular structure of hemoproteins, which one of axial ligands is weak.
The Effect of Mn Content Solution-treatment Temperatures on Insoluble Phases in Al-Li-Cu-Mg-Mn-Zr Alloys
Shin, Hyun-Sik ; Ming, He ; Cho, Kwon-Koo ; Chung, Young-Hoon ; Shin, Myung-Chul ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 517~526
Large insoluble phases and dispersoids in Al-Li-Cu-Mg-Mn-Zr alloys containing Mn were analyzed with EPMA(Electron Probe Microanalyzer) and SAEM(Scanning Auger Electron Microscope). Morphology, distribution and volume fraction of the large insoluble phase were also analyzed quantitatively by optical microscopy. Mechanical properties were tested at room temperature and at
. With increasing Mn contents, the volume fraction of the large insoluble phases increased steeply, thus decreasing ductility. Mn was found to be very effective for obtaing uniformly distributed fine-grain structures. The alloy containing 0.44 wt% Mn showed the highest tensile strength among Mn-bearing alloys tested.
Analyzing Surface Microstructure of 7050A1 Alloy Modified by
Lee, Chang Woo ; Kwun, S.I. ; Han, Jeon Geon ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 527~540
The surface microstructure modification by
implantation into 7050A1 alloy was investigated. Ion implantation method is to implant physically accelerated ions to the surface of a substrate. High doses of nitrogen(
) were implanted into 7050A1 alloy using accelerating voltage of 100KeV and current density of
. The implanted layers were characterized by EPMA, AES, XRD, and TEM. The experimental results were compared with computer simulation data. The results showed that AlN was formed from the surface to
depth with Gaussian distribution and the damage region was also observed. This surface modification by
implantation increased the microhardness of 7050A1 alloy surface.
Relationships Between the Content and Sensory Evaluation of Pungent Principles in Red Pepper
Chai, Jeungyoung ; Kim, Minsun ; Han, Ilkeun ; Lee, Sangyun ; Yeo, Ikhyun ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 541~545
The pungent principles of 20 Korean red peppers(Capsicum spp.) were analyzed by high performance liquid chromatography(HPLC) method. Capsaicinoids levels were considerable from 7.0mg/100g to 75.9mg/100g in Korean red peppers. The index value of the variety, ratio of capsaicin to dihydrocapsaicin was 0.8~1.1. This fact reveals that several varities of red pepper have existed in Korean. The sensory intensity of pungent principles was completely accordant with instrumental analysis result until 10ppm of capsaicinoids. The acceptance concentration of pungent principles was from 7.8ppm to 15.6ppm in Korean people.
Constituents of Ceramide of a Native Mushroom, "Phellinus ribis" in Korea
Moon, Dong-Cheul ; Hwang, Kyung-Hwa ; Choi, Kyu-Reul ; Lee, Yong-Moon ; Kim, Jung-Hoon ; Kim, Jae-Gil ; Park, Young-Hyun ; Kim, Mi-Ran ; Zee, Ok-Pyo ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 547~554
Ceramide components were detected from a native mushroom, "Phellinus ribis" growing in Korea. Cerebroside fractions were isolated by silica column chromatography. The ceramide fraction were purified by preparative TLC and their constituents were analyzed by using GC-MS and FAB-MS. The fatty acid components consisted of mainly hydroxy fatty acids(
) : The major components of long-chain base were trihydroxy-bases, principally 4-hydroxy sphinganin analogues.
Determination of Trace Elements in Urine Samples by Graphite Furnace Atomic Absorption Spectrophotometry
Choi, Chong-Moon ; Choi, Hee-Seon ; Park, Chang Joon ; Kim, Young-Sang ;
Analytical Science and Technology, volume 7, issue 4, 1994, Pages 555~561
A method was described for the graphite furnace atomic absorption spectrophotometric determination of trace cadmium, copper, chromium and lead in urine samples. The elements were directly determined without any other treatments. The ash temperature was intensively optimized to improve the large background by the removal of organic materials and alkali and alkali earth metals in urine samples. Two kinds of standard solutions were used to plot calibration curves. From the recovery data, it could be confirmed that the analytical results with the synthetic urine matrix similar to real urine were more accurate than with a deionized water matrix.