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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Analytical Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Analytical Science
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Volume & Issues
Volume 12, Issue 6 - 00 1999
Volume 12, Issue 5 - 00 1999
Volume 12, Issue 4 - 00 1999
Volume 12, Issue 3 - 00 1999
Volume 12, Issue 2 - 00 1999
Volume 12, Issue 1 - 00 1999
Selecting the target year
Profiling of Urinary Environmental Estrogens by Gas Chromatography/Mass Spectrometry
Yang, Yoon-Jung ; Lee, Seon-Hwa ; Chung, Bong-Chul ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 265~272
A simultaneous profile analysis of 19 environmental estrogens, which act like estrogen and may effect the endocrine system by binding to hormone receptors or influencing cell signaling pathways, was attempted. The present method was based on the selected ion monitoring (SIM) mode of gas chromatography/mass spectrometry (GC/MS). It involves solid-liquid extraction, enzyme hydrolysis, liquid-liquid extraction and quantitative conversion into trimethylsilyl (TMS)-ether derivatives. Analytical recovery range was 47.6 ~ 99.5% and the RSD values of within-a-day and day-to-day test were 0.66 ~ 9.33%, 1.66 ~ 16.14%, respectively. The Korean reference values for the evaluation of environmental estrogen effects were established by this method.
Simultaneous Determination of Mercury and Arsenic by Reductive Vapor Generation-ICP-AES
Shin, Hyung-Seon ; Choi, Man-Sik ; Kim, Kang-Jin ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 273~278
Simultaneous determination of mercury and arsenic has been studied by reductive vapor generation-ICP-AES. Samples were digested with a microwave digestion system and extracted with acids. Reductive vapor generation was carried out with 6N HCI and 2%
. Detection limit of Hg and As are found to be 0.06 ppb and 0.08 ppb, respectively. Measured values of Hg and As in inorganic samples agree well with reference value of SRMs, but the recovery of As from organic samples is obtained approximately 80% of the reference values.
The Determination of
in Stack Effluent Gases by Carbonate Suspension Counting Method
Chun, Sang-Ki ; Woo, Hyung-Joo ; Cho, Soo-Young ; Kim, Nak-Bae ; Lee, Jong-Dae ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 279~283
The purpose of this study was to optimize carbonate suspension counting method for the measurements of high level activity of
in a reactor stack effluent gases. Although it is less sensitive method, the carbonate suspension counting method has been found to be a suitable technique for the
monitoring of samples with small amount but with high specific activity and to be relatively simple and fast.
A Study on the Quantitative Recovery of Dissolved Inorganic Carbonates in Ground Water for Radiocarbon Measurement
Chun, Sang-Ki ; Woo, Hyung-Joo ; Cho, Soo-Young ; Kim, Nak-Bae ; Lee, Jong-Dae ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 284~289
Dissolved inorganic carbonates in ground water were quantitatively recovered by using gas evolution method. Gas evolution method was found to be less time-consuming, less susceptible to the contamination fromatmospheric
and little affected by the sulfate ions in comparison to the direct precipitation method. Extraction efficiency of nearly 99% could be achieved by gas evolution method in two hours using recirculated gas at a sweeping rate of 4 liter per minute. Samples for carbon isotope fractionation study were collected in three fractions with collection times. The evolution time for the first fraction was one hours, and then second and third fractions were collected at intervals of 30 minutes, respectively. A small portion of each fraction was analyzed to evaluate
values, which were measured to be -7.9‰, -3.0‰ and +0,4‰ for the each fraction. The result clearly indicated that gas evolution method generates isotopically lighter carbon at the beginning of the purging process and heavier isotopes at the end. However, this isotope fractionation effect could be neglected by the almost complete recovery of carbonates.
A Study on the Precise End-Point Detection in Titration by Using the Phase Angle Measurements
Park, Byung-Bin ; Shin, Ho-Sang ; Lee, Han-Hyoung ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 290~298
A study on the application of impedance phase angle for redox titration, acid-base titration, chelate titration and precipitation titration has been carried out. A constant alternating current was passed between two platinum electrodes. One of them was a polarizable micro-electrode of
surface area and the other a non-polarizable large electrode of
surface area dipped in the solution to be titrated. The impedance and the phase angle of the titration cell were measured with lock-in amplifier to obtain well behaved titration curve respectively. In titration of oxalic acid vs. potassium permanganate, the end-point was obtained successfully from the phase angle titration curve. In this experiment, the concentration of 0.0005 M to 0.05 M, the current of
and the frequency of near 50 Hz were used. In titration of phosphoric acid vs. sodium hydroxide, the first end-point was obtained successfully on the optimum experimental condition of 0.001 M concentration,
current and 25~97 Hz frequency. However, the end-point in titration of cupric sulfate vs. disodium-EDTA couldn't be obtained clearly. The end-point was obtained with the out-of-phase impedance curve on the experimental condition of 0.01 M concentration,
current, 5~35 Hz frequency range. In titration of sodium chloride vs. silver nitrate, the end-point was obtained successfully on the experimental condition of 0.1 M concentration,
current and 5~47 Hz frequency range. This study showed that the impedance phase angle was applicable for the detection of the end-points in redox titration curve, acid-base titration curve, chelate titration curve and precipitation titration curve.
Fundamental Studies on the Development of On-line Monitoring of Trace Mercury in Drinking Water
Chang, Soo-Hyun ; Kim, Hyo-Jin ; Kim, Sun-Tae ; Kim, Young-Man ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 299~305
The electrolyte cathode atomic glow discharge (ELCAD) is a new plasma source for direct determination of trace heavy metals in drinking and waste water. ELCAD has been successfully developed for on-line monitoring of heavy metals, however, shows difficulty to measure mercury. In this study, ELCAD has been modified to apply the atomic absorption spectrometry (AAS) for the direct determination of trace elements of mercury in flowing water.The fundamental characteristics of this new types of plasma source have been investigated and found that the pH of the solution, discharge voltage, and current are most important factors.The absorbance of 1.0 ppm Hg standard solution increases as pH of the solution increases from pH 1.0 to 3.0.However, % RSD of the absorbance also increases as the pH of solution increasesdue to plasma unstability.The detection limits of the standard solution of pH 1.5 and pH 3.0 are about 40 ppb and 10 ppb level, respectively.
Changes of Silk Protein Compositions by Solubility Condition
Yeo, Joo-Hong ; Lee, Kwang-Gill ; Lee, Yong-Woo ; Nam, Jin ; Kim, Sun-Yeou ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 306~311
Changes of silk protein compositions of average molecular weight (Mw) and free amino acid composition to different solubility conditions were studied by SDS-polyacrylamide electropholesis, gel permeation chromatography (GPC), and free amino acid analysis method. We can not detected average molecular weight distribution of different hydrochloric acid (HCl) conditions as SDS-polyacrylamide method, but as using GPC method, molecular weight distribution of 2N-HCl, 1N-HCl and 0.5N-HCl (3 hrs at
treated) are confirmed Mw 800, 1,500 and 3,700, respectively. The average molecular weight of calcium chroride and calcium chloride-enzyme treated samples are shown Mw 46,800 and 12,500, respectively. The degree of hydrolysis and the composition of the free amino acid in the fibroin hydrolysates effected significantly composition of free amino acids of the fibroin powder. The increase of the degree of hydrolysis and ratio of free amino acids and oligopeptides were found to be directly related to the concentration of hydrochloric acid and treatment of enzyme, resulting in the increase of water solubility.
Quality Control on the BOD, COD, TN, TP of Water Quality Pollutant
Park, Sun-Ku ; Kim, Tae-Seung ; Ryu, Jae-Kyun ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 312~317
Quality control was carried out the three analytes, BOD, COD, TN, TP of high and low concentration for thirteen laboratories. Evaluation values of Quality control was determined from average value which were made by six times test, repeatedly and periodically. This value had not only error ratio of within 5% from prepared sample value but also high precision of standard deviation, 0.44 (BOD, low concentration), 2.15 (BOD, high concentration), 0.12 (COD, low concentration), 1.63 (COD, high concentration), 0.35 (TN, low concentration), 1.99 (TN, high concentration), 0.05 (TP, low concentration), 0.14 (TP, high concentration). Upper (Lower) Warning Limit (ULWL) and Upper (Lower) Acceptance Limit (ULAL) values made from quality control chart. Three (5.30, 9.70, 5.30 mg/L) and five laboratories were over ULAL value in low and high BOD concentration, respectively. Two (41.00, 30.60 mg/L) and four laboratories were over ULAL value in low and high COD concentration, respectively. while, other eleven laboratories appeared reliable data. One laboratory (0.70 mg/L) was over ULAL at low TN concentration, while other eleven laboratories had reliable values. In case of high TN concentration, eleven laboratories were over ULAL value, it should be focuced for improvement of reliability about measurement and analysis of TN. Four (1.14, 0.45, 0.64, 1.49mg/L) and seven laboratories were over ULAL in low and high TP concentration, respectively.
Analysis of Sludges from Wastewater of Hanji Production
Choi, Hee-Seon ; Kim, Tai-Jin ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 318~325
Sludges from the wastewater of hanji production were analysed to see that sludges from the bleaching process, the bleach washing process, and the paper preparation process were fibrous, while sludges from the process cooking with NaOH and the process of final chemical and microbiological treatment were non-fibrous. Sludge solution from the bleaching process had the most amount of solid matters. Sludges from the bleaching process, the bleach washing process, and the final chemical and microbiological treatment process contained about 80-90 %(w/w) moisture. Owing to hypochlorite ion, pH of sludge from the bleaching process was higher than any other sludge samples. The inorganic components of sludges were determined by ICP-AES. The major inorganic component of sludge from the process cooking with NaOH was Na, while the sludge from the bleaching process had Na and Ca, major components in the final chemical and microbiological treatment process were Ca and Al. Trace amount of Mg, Fe, K, P, Mn and Ti were observed in sludges. Sludge from the bleaching process had ashes more than any other sludges. Shape of sludges observed by SEM was appeared to fibrous or crystalline, and the breadth of fibrous sludge was
. The sludge from the bleaching process had the most amount of matters soluble by cold and hot water and by alcohol-benzene.
Analysis of the Metabolites of 1,2,4-Trimethylbenzene by Capillary Electrophoresis
Kang, Jong-Seong ; Hong, Cheong-Hee ; Lim, Jeong-Mi ; Lee, Yong-Moon ; Jang, Jae-Yeon ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 326~331
The metabolites of 1,2,4-trimethylbenzene (TMB) were synthesized and determined by capillary electrophoresis (CE). The optimum conditions of CE for the separation and determination of 3,4-, 2,4-, 2,5-dimethylbenzoic acid and 3,4-, 2,4-, 2,5-dimethylhippuric acid from the rat urine were as following: the fused silica capillary(
36 cm length, 29 cm to detector) was used and kept at
. The applied voltage was 10㎸ and compounds were detected at UV 210 mnm and 254 nm. The running electrolyte was 0.1 M phosphate buffer (pH 7) containing 15 mM of
and 3% of 2-propanol. The relative amount of the metabolite of 1,2,4-TMB in the rat urine was 56.7% of 3,4-isomer, 30.5% of 2,4-isomer and 12.8% of 2,5-isomer. This method can be applied to the analysis of TMB-metabolites in human urine.
Construction and Evaluation of Cryogenic Preconcentration System for Analysis of VOC with ppb Level in the Air
Jeon, Sun Joo ; Kim, Byung Joo ; Kim, Jin Seog ; Heo, Gwi Suk ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 332~340
Homemade cryogenic preconcentration system is constructed to preconcentrate the VOCs in the ambient air collected in canister. Homemade preconcentrator equipped with GC-MS was used for analysis of air sample containing VOCs at ppb level identified in EPA TO-14 method. The system was evaluated for analytical performance by comparison with the results of adsorption tube method widely used in the past, and shows good agreement for concentrations of benzene, toluene, ethylbenzene, and xylenes.
Simultaneous Analysis of Inorganic Cations by Capillary Zone Electrophoresis
Park, Sung-Woo ; You, Jae-Hoon ; Jin, Kwang-Ho ; Seo, Bae-Sug ; Kim, Young-Sang ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 341~345
The separation and determination of inorganic cations by a capillary zone electrophoresis was studied. Cations were separated by the capillary column and detected by indirect UV method. The running buffer of 0.03 M creatinine and 0.02 M-hydroxy isobutylic acid solution (pH 4.8) was used to improve the mobility of ions in the column. A potential of 18 kV was applied at anode. A complete separation of cations ranged within 15 min and detection limits were between 0.1 and 1.0 ppm. The applicability of the method for real samples was demonstrated.
Data intercomparison and determination of toxic and trace elements in Algae using Instrumental Neutron Activation Analysis
Chung, Yong-Sam ; Moon, Jong-Hwa ; Park, Kwang-Won ; Lee, KiI-Yong ; Yoon, Yoon-Yeol ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 346~353
For the non-destructive multi-elemental analysis of environmental and biological materials, instrumental neutron activation analysis (INAA) was applied for the determination of toxic and trace elements in a set of three Algae samples provided by the International Atomic Energy Agency (IAEA). The analytical quality control was evaluated by comparing the analytical results of two standard reference materials of the National Institute of Standards and Technology (NIST); Oyster Tissue (SRM 1566a) and Citrus Leaves (SRM 1572). According to given analytical procedure, the concentration of 15-25 elements including spiked elements such as As, Cd, Cr and Hg in Algae samples were determined. To identify and validate these results, a data intercomparison program using more than 35 analytical methods in 150 laboratories was carried out and the estimated statistical data are summarized. Result of INAA is favorable, therefore, it is illustrated that can be applied for routine analysis of essential and toxic elements in algae samples as well as analytical quality assurance.
Review : Characteristics of Gas Chromatograph - Atomic Emission Detector ( GC-AED )
Ha, Jae-Ho ;
Analytical Science and Technology, volume 12, issue 4, 1999, Pages 355~355