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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 9, Issue 4 - 00 1996
Volume 9, Issue 3 - 00 1996
Volume 9, Issue 2 - 00 1996
Volume 9, Issue 1 - 00 1996
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The Study of Generation of Adduct and Fragment Ions by LC/TSP/MS
Kim, Yunje ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 1~12
The thermally labile compounds with hydroxyl group generate the [
] ion, [
] and [
] ion by ion-molecule reaction in LC/TSP/MS. But these ions create the trouble in the estimation of molecular weight of an unknown compound because the margin of [
] ion and [
] ion is same to that of [
] ion and [
] ion. If it is compensated for the results by using of the
LC eluent, the molecular weight of analyte will be able to be confirmed. And this study was tried to recognize whether the fragment ions of thermally labile compound are generated by electron impact or by thermal degradation in ion source.
Electrophoretic Analysis of Cotyledons and Roots of Ricinius communis L. by Abscisic Acid(ABA) Treatment
Cho, Bong-Heuy ; Park, Sun Young ; Lee, Jong Ho ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 13~19
To treatment of Ricinus cotyledons with ABA, induced several proteins with molecular weights of 53, 54, 56, 58 and 73.5kD. 54 and 56kD among those proteins resulted in increased more when ABA concentrations in external media are increased. The molecular weight of 35, 49, 53, 54, 62, 65 and 79kD of proteins are induced by ABA treatment of roots. The induced proteins are not the same a those by cold treatment exception of 73.5kD of cotyledons and 62kD of roots. 49, 58 and 79kD of proteins are important to research in future because of the induction of proteins in the presence of cydoheximide(CH) which is blocked the synthesis of proteins.
Low-level Determinations of Uranium and Thorium in Geologic Samples by X-ray Fluorescence
Park, Yong Joon ; Kim, Jung Suk ; Choi, Kwang Soon ; Suh, Moo Yul ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 20~25
Trace levels of uranium and thorium in geologic samples are determined rapidly by a direct wavelength-dispersive X-ray fluorescence method. Relative intensity of scattered tube radiation was used as an internal standard to compensate for variations in instrumental operating characteristics. U and Th can be determined within a precision of
and accuracy of
or less with measuring times of 50 seconds for Th and 400 seconds for U, respectively. The results of XRF analysis were in good agreement with those of other methods such as nutron activation analysis and inductively coupled plasma atomic emission spectrometry.
A study on the Determination of Trace Se and Bi in the Scalp Hair by Hydride Generation- Inductively Coupled Plasma Atomic Emission Spectrometry
Choi, Beom Suk ; Lee, Dong Kee ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 26~34
A method to determine the trace amount of Se and Bi in the scalp hair using the hydride generation inductively coupled plasma atomic emmission spectrometry was studied. The optimum operation conditions of ICP for hydride generation are 0.6~0.8L/min for the carrier gas flow rate, and 6mm above the induction coil for the observation height. Hydrochloric acid concentrations for the optimum hydride generation conditions were greater than 1.5M when 2.5%
and NaOH were used, and greater than 0.5M when 2.5%
and 0.1% NaOH were used. Severe interference effects are observed from transition metals such as Cu and Ni, and they could be circumvented by the coprecipitation with lanthanum hydroxide.
Effect of Coexisting Ions on Electrokinetic Injection in Capillary Electrophoresis Analysis
Lee, Kwang-Woo ; Jeon, Ji-Young ; Lee, Kwang-Pill ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 35~42
A rapid analytical method based on capillary electrophoresis is described for the determination of trace anions in high-purity chemicals which is used to prevent corrosion demage in nuclear power plants. Separations are carried out at 20kV using trimethylsilane-coated fused-silica capillary (
i.d.) with the electrolyte of 5mM Chromate(pH=8). Detection was achieved using on-column indirect photometry at 254nm. The simultaneous analysis of inorganic anions, chloride, nitrate, sulfate, azide and phosphate was performed using methods of hydrodynamic(>1ppm) and / or electrokinetic(<1ppm) injection. The results of studies on the coexisting anions on analyte ions shows that peak responses of analyte in hydrodynamic injection is constant without effect of coexisting anions, but those of analysis in electrokinetic injection is strongly dependant upon the kind of coexisting anions and its ionic mobility. The analyte enrichment rate, hence peak response, is positive relationship with the resistance of the sample solution. Thus, appropriate measures, such as standard addition or internal standard technique, must be used to account for differences in conductance of standard and sample solutions.
The relation of structural transition, thermal and electrical stability deintercalation of Li- CICs(II) : For Li-EaGDICs and Li-EGDICs
Oh, Won-Chun ; Park, Chung-Oh ; Back, Dae-Jin ; Ko, Young-Shin ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 43~51
We have discussed on the deintercalation process of Li-EaGICs and Li-EGICs synthesized under pressure and temperature by spontaneous oxidation reaction of those compounds based on the results of X-ray diffraction, thermal analysis and electrical specific resistivity analysis. According to the results of the X-ray analysis for the intercalation process, we have found that the stage 1 for Li-EaGICs and Li-EGICs were not completly formed, but their lower stages were formed mainly. And from this results of the deintercalation process, we have found that the deintercalation process did not occur any more after 4 weeks, and the Li-EGDICs have more residual lithium metals than LiEaGDICs between the graphite interlayers. According to the thermal decomposition analysis, Li-two compounds had included very hard exothermic reaction. And we have found that these compounds did not occrurred deintercalation reaction above
. According to the results of the electrical specific resistivity measurements, Li-EGDICs have relatively lower electrical specific resistivity than Li-EaGDICs, and Li-EaGDICs showed a formation of the ideal curve. From these results, we can suggest that Li-EaGDICs have a better properties as an anode material secondary than Li-EGICs.
Micro-Determination of D-Amino Acids in Food by Using Achirai/Chiral Coupled Column Method
Lee, Sun-Haing ; Chang, Youn-Hee ; Lee, Kwang-Pill ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 52~61
Detectable levels of several free D-amino acids were found in some food. This was accomplished by using a column switching method. The determination of total amount of D- and L-amino acids was based on an achiral separation with a
column. The level of D-amino acids to L-amino acids was determined by the column switching system including the postcolumn reaction detection of the amino acids derivatized with O-phthalaldehyde. The chiral separation of the postcolumn detection system was carried out with chiral crown ether column. This system was applied for the micro-determination of D-amino acids in food such as soy sauce, fermented soy bean and beans. It turned out that the sampling process is critical for the trace analysis of D-amino acids under this achiral / chiral coupled-column system. It was found that commercial soy sauce contained 42ppm, conventional soy sauce 102ppm, fermented soy bean 8.34mg per 1g and bean 2.87mg per 1g sample for phenylalanine. D-phenylalanine was found 0.67% in commercial soy sauce, 0.34% in conventional soy sauce, less than 1.81% in fermented soy bean, and Jess than 2.82% in bean.
Photocatalytic Reaction of Sensitizer, Rose Bengal and Supersensitizer, Thiourea
Yoon, Kil-Joong ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 62~71
The enhancement of the solar energy conversion efficiency into the electrical energy by the dye sensitization with a photoelectrochemical cell was studied. The magnitude of the rose bengal sensitized photocurrent containing the supersensitizer, thiourea was five times greater than that in the absence of thiourea. It was observed, however, that the long time span of irradiation causes the decrease in the photocurrent. Spectroscopic analysis of the dye solution showed that the dye molecule was photobleached and the insoluble aggregate which settles down in the solution, was formed as a result of the possible photocatalytic reaction and the disappearance of dye from the solution was the cause of the decreased photocurrent in the sensitization run.
by a Photocatalytic Reaction of Rose Bengal
Yoon, Kil-Joong ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 72~77
In the process of solar energy conversion into electrical energy using the photoelectrochemical cell containing the sensitizer, rose bengal and supersensitizer.
, the photocurrent is stabilized and durable. But the long time span of irradiation causes the decrease of photocurrent monotonically. Spectroscopic and electrochemical analyses of rose bengal solution containing
revealed that the decrease of concentration of rose bengal was attributed to the reaction of rose bengal in the dark with
formed as a result of the possible photocatalytic reaction of rose bengal with
Hydrogen ion-selective membrane electrodes based on arylamines as neutral carriers
Jeong, Seong-Suk ; Cho, Dong-Hoe ; Kim, Jae-Woo ; Chung, Koo-Chun ; Park, Myon-Yong ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 78~83
Hydrogen ion-selective membrane electrodes based on tribenzylamine(TBA), tetrabenzylethylenediamine(TBEDA), pentabenzyldiethylenetriamine(PBDETA) as neutral carriers were shown good selectivity and linearity in the range of pH 1~pH 9, pH 2~pH 12, pH 4~pH 12. The pH selectivity of this membrane electrodes have nothing relation with the numbers of unshared electron pair in TBA, TBEDA, PBDETA and were shown a slope of 43.8mV/pH, 46.9mV/pH, 43.6mV/pH respectively. The selectivity coefficients were determined by the separate solution method for alkali(
), alkaline earth metal(
) and transition metal ions(
). The membrane electrode based on TBEDA appeared the best results as hydrogen ion electrode.
Application of Hepatocyte Specific Polymers with Functional group
Lee, Jung Bock ; Kim, Jae Woong ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 84~90
New hepatocyte specific copolymers, that have oligosaccharide and biotin residue on the side chain of styrene, were designed and synthesized to use as a multifunctional recognition. In order to measure initial adhesion efficiency, 1mL of copolymer solutions (0.01%, w/v) such as p(VLA-co-VBA) 90 : 10, p(VLA-co-VBA) 80 : 10 and PYLA as a standard were added to polystyrene petri dish, respectively. In the absence and presence of serum, hepatocyte solution of rat by method of Seglen was added. After 60 min, adhesion efficiency was 70%, that is similar to those of the absence of serum. Aggregation capacity between biotin residue in p(VLA-co-VBA) 70 : 30 and avidin was measured by using UV-transmittance.
Measurement of Binding Constant between Chemical Compound and Humic Acid
Yook, Keun-Sung ; Kim, Yong-Hwa ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 91~97
The extent of binding(
) between chemical compound and humic acid was measured as an indicator of decrease in toxicity. From the experimental
, no reduction of toxicity among test chemicals in aquatic systems were predicted except P,P'-DDT. The effect of humic acid on aquatic organisms is not expected to be significant for the compounds with
Studies on the Transportation and Wet Deposition of Air Pollutant(
) by Modeling and Precipitation Analysis in Wonju City
Kwon, Young Sik ; Song, Dong Woong ; Kang, Kyung Ho ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 98~106
The concentration of sulfur dioxide in Wonju City was predicted using TCM (Texas Climatological Model). We have studied the transportation and wet deposition of
using the TCM and the analysis of rainfalls. The results are as follows : At the Hak-Sung Dong site in Wonju city, the correlation coefficient between the measured and calculated concentrations were 0.904. Sulfur dioxide was washed out by wet deposition. The wet deposition ratio to total amount of emitted sulfur dioxide was higher in summer than in autumn and winter seasons due to heavy rainfall in summer. The correlation coefficient between the precipitation and wet deposition of sulfur dioxide was 0.68. The months with greater rainfall showed that the measured concentrations of sulfur dioxide were much lower than the predicted ones. Although the amount of precipitation in April was smaller than in summer, the wet deposition ratio in April was much higher than any other months, due to the sulfur dioxide that was adsorbed on particulate matter and moisture was transported during the period of yellow sand phenomena from China.
Structure Elucidation of Sesquiterpenoid from Pathogenic Fungus Bipolaris cynodontis
Lim, Chi-Hwan ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 107~111
A phytotoxic compound was isolated from a culture of Bipolaris cynodontis, a fungus pathogenic to Bermuda grass. The structure was determined by spectroscopic analyses including 2D NMR experiments, to be sesquiterpene having a 9-carbon unit side chain. The compound inhibits the root growth of the seedlings of Italian ryegrass and rice plant, the host plant of the B. cynodontis, by about 100% at 100ppm, and it is suggested that this may play an important role in the expression of the disease symptom.
Structure Elucidation of New Cochlioquinol Derivatives from Pathogenic Fungus Bipolaris cynodontis
Lim, Chi-Hwan ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 112~117
Three active compounds were isolated from the culture of a plant pathogenic fungus, Bipolaris cynodontis. The structure elucidation of these compounds was accomplished by 2D NMR techniques, such as
COSY, COLOC, HMBC and rotating frame NOE(ROESY). Compounds were found as derivatives of cochlioquinone and cochlioquinol that were previously isolated as phytotoxins from B. bicolor and B. cynodontis, respectively. The compounds showed phytotxicity against Italian ryegrass, one of the host plants of B. cynodontis.
Isolation of Humic Acid from Water
Yook, Keun-Sung ; Kim, Yong-Hwa ;
Analytical Science and Technology, volume 9, issue 1, 1996, Pages 118~121
56.2% of Aldrich HA was recovered from water by XAD-8 and AGMP-50 procedure. With this method, 0.58mg/l of HA was determined in the water collected from irrigation reservoir near Tae Dok Science Town. For the removal of ash from Aldrich HA, centrifugation was simple, but as effective as dialysis. Neither centrifugation nor dialysis removed Na at all. Only with XAD-8 and AGMP-50 procedure, Na and ash were completely removed.