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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Analytical Science and Technology
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The Korean Society of Analytical Science
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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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Studies on Solvent Extraction and Analytical Application of Metal Dithiocarbamate Complexes(II). Extraction Equilibria of Metal-Dibenzylammonium dibenzyldithiocarbamate Complexes
Lee, Jong-Sun ; Choi, Jong-Moon ; Choi, Hee-Seon ; Kim, Young-Sang ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 221~234
Basic studies for the effective extraction of dibenzylammonium dibenzyldithiocarbamate(DBADBDC) complexes of Ag(I), Pd(II), Au(III) and Pt(IV) into chloroform have been conducted. The effects of pH on the extraction of ligand itself and metal cemplexes showed that DBADBDC itself was uniformly extracted in the pH range of 2~9 and metal complexes were effectively extracted at the pH range as follows. That is, Ag(I) : in an acidic aqua medium, Pd(II) : > 4, Au(III) : wide range, and Pt(IV) : > 3. The distribution ratio and extractabilities were obtained from the partition and extraction equilibria of metal-DBDC complexes between aqueous solution and chloroform. Ag(I) : log D=4.226 : E(%)=99.9% in the aqueous solution of pH 0, Pd(II) : log D=1.804 : E(%)=98.5% at pH 4~7, Au(III) : log D=3.755 : E(%)=99.9% at pH 2~10, and Pt(IV) : log D=0.165 : E(%)=57.2% at pH 8.0. And also mole ratio of metal ion to ligand in complexes were determined by mole ratio method : 1 : 1 for Ag(I) and 1 : 2 for Pd(II), Au(III) and Pt(IV).
was included as a coordination species in complexes of Au(III) and Pt(IV). Besides, extraction mechanisms of compleses sere examined in the presence of chloride ion in an aquous solution, and extraction reactions and estraction constants could be proposed and calculated, respectively.
-Cyclodextrin Modified Carbon Paste Electrode
Jeon, Young-Guk ; Kim, Bong-Weon ; Kim, Hee-Jung ; Cho, Young-Dal ; Chung, Chinkap ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 235~243
A carbon paste electrode were chemically modified using
-cyclodextrin. Characteristics of chemically modified carbon paste electrodes were studied on the basis of the inclusion complex formation of
-cyclodextrin and p-nitrophenol in solution. Cyclic voltammetry and differential pulse voltammetry were used to monitor the efficiency of the chemical modification. When the
-cyclodextrin and carbon powder ratio of 2 : 1 in weight were used, the reduction peak current of p-nitrophenol was decreased almost completely, whereas those of o-nitrophenol and hydroquinone were not changed much. This result is due to the large difference in the inclusion complex formation constants of p-nitrophenol and the other probes with
-cyclodextrin. Taking advantage of this difference, we can determine the concentration of o-nitrophenol even in the presence of p-nitrophenol.
Spectrophotometric Determination of Lanthanide Ions by Flow Injection Analysis
Kang, Sam-Woo ; Cho, Kwang-Hee ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 244~252
Spectrophotometric properties of lanthanide complexes with methylthymol blue(MTB) and cetyltrimethylammonium bromide(CTAB) were studied and also lanthanide(III) ions were determined by flow injection analysis on the base of the above results. The absorption maxima of lanthanide(III)-MTB complexes in the presence of CTAB are 635nm with molar absorptivity of
at pH 5.8. The mole ratio of lanthanide(III) complexes with MTB is 1:2 in the presence of CTAB. The calibration curves of lanthanide(III) ions obey the Beer's law in the range of 0.1 to 0.4ppm under the optimum condition. The samples throughput was ca.
. The interfering effect of some cations and anions was investigated. The ligand anions such as tartrate and citrate, many transition and rare earth elements interfered severely and must be removed before the determination of lanthanide(III) ions.
A Study on the Trace Analysis of Germanium in Inorganic Matrices by Differential Pulse Polarography
Shin, Ho-Sang ; Oh, Yun-Suk ; Shin, Hak-Soo ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 253~261
Analytical method for the determination of trace germanium in inorganic matrices by differential pulse polarography(DPP) was studied. The reduction peak of germanium(IV) in perchloric acid solution containing 1, 2, 3-trihydroxy benzene appeared at -0.45V(vs. Ag/AgCl) and the peak current for germanium complex varied linearly with concentration variation. Factors affecting sensitivity and precision for germanium quantification were studied and detection limit under the investigated parameters was 1ng/ml. Inorganic samples were decomposed by fusion with potassium pyrosulfate. Serious interferences of Se(IV), Pb(II), As(III) for the determination of germanium were discussed. Interferences of these elements could be avoided by extraction of germanium from decomposed matrices by
in 10M HCl solution. The germanium contents of inorganic samples(Pb bf. dust, Cu bf. dust, gneiss, Cu anode slime) were determined by the above method.
Development of Multiwire Proportional Counter for Measurement of Environmental-level Alpha Particles
Oh, Pil Jae ; Park, Tae Soon ; Lee, Min Kie ; Kim, Kyung Hwa ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 262~269
The muiltiwire proportional counter for the measurement of low-level and environmental
particles emitting nuclides was developed. External dimension of the devloped multiwire proportional counter is
and the sensitivity area is
. The wall material of the detector was selected the stainless steel to prevent the deformation by external impact and to obtain minimum background. The anode and cathode wires were used the stainless steel material of diameter
. The spacing of each wires are 10.0mm, 5.0mm and the numbers of total wire are 21, 42 lines, respectively. The multiwire proportional counter was designed that the measurement source is placed within the detector to prevent the wall absorption effect and the efficiency variation by various source heights. The characteristics of the developed detector have been investigated to obtain the plateau, operating voltage, background, counting efficiency, position sensitivity and energy resolution etc. For the
nuclide, the calculated LLD(Lower Limit of Detection) is 5.0mBq/L which is lower than 40mBq/L of recommended LLD value by ISO(International Organization for Standardization).
Response Mechanism of 5, 10, 15, 20-tetraphenyl(porphyrinato) Manganase(III) chloride-Based Ion-Selective Membranes
Hong, Young Ki ; Kang, You Ra ; Shin, Dae Ho ; Shin, Doo Soon ; Cha, Geun Sig ; Nam, Hakhyun ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 270~278
Response mechanism for the chloride-selective membrane doped with 5, 10, 15, 20-tetraphenyl(porphyrinato)manganase(III) chloride(Mn(TPP)Cl) in PVC/DOS matrix is proposed by examining the visible spectra of the corresponding optode membrane. The visible spectra of Mn(TPP)Cl-doped membrane placed in aqueous solution show that the chloride ligand is easily replaced with water molecule. When other halogen ions, such as
, are added to the sample solution, they replace the water ligand, exhibiting distinctive change in the Soret band of Mn(TPP). On the other hand, bulky anions, such as SCN and salicylate, do not form a bond with the central metal. These results suggests that the potentiometric response of Mn(TPP)-based membrane results either from the ligand exchange (water with halides) at the central metal or from the counter ion exchange (chlorides with bulky lipophilic anions) around the positively charged porphyrin molecule in membrane phase. It was also noted that both hydration enthalpies of anions and their binding constants to Mn(TPP) play critical role in determining the potentiometric selectivity pattern of the membrane.
Studies on the Separation and Preconcentration of Metal Ions by Chelating Resin containing (Polystyrene-divinylbenzene)-thiazolylazo Phenol Derivatives(I)
Lim, Jae-Hee ; Kim, Min-Kyun ; Lee, Chang-Hun ; Lee, Won ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 279~291
The new chelating resins, XAD-2, 4, 16-TAC and XAD-2, 4, 16-TAO were synthesized by Amberlite XAD-2, XAD-4, and XAD-16 macroreticular resins with 2-(2-thiazolylazo)-p-cresol(TAC) and 4-(2-thiazolylazo)orcinol(TAO) as functional groups and were characterized by elemental analysis and FT-IR spectrometry. It was found that the content of functional group in chelating resin was 0.60mmol/g in XAD-16-TAC and 0.68mmol/g in XAD-16-TAO respectively. The chelating resins were stable in acidic and alkaline solution and can be reused over 10 times. The sorption behavior of some metalions to two chelating resins was investigated by batch method, which included batch equilibrium, effect of pH, coexisting ions and masking agent. For the optimum condition of sorption, the time required for equilibrium was about 1 hour and optimum pH was 5. In the presence of anions such as
, the sorption of U(VI) ion was slightly reduced but other anions such as
revealed no interference effect. Also, sorption capacity of U(VI) ion was decreased by addition of
ion because of complex formation of
, but alkali metals and alkali earth metals including Na(I), K(I), Mg(II), and Ca(II) were not affected for the sorption extent. Masking agent, NTA showed better separation efficiency of U(VI) ion from coexisting metal ions such as Th(IV), Zr(IV), Hf(IV), Cu(II), Cd(II), Pb(II), Ni(II), Zn(II) and Mn(II) than EDTA, CDTA.
Electrochemical Properties and Synthesis of Poly(ether)tailed Cobalt(II)bipyridine Complex
Kim, II Kwang ; Jun, II Chul ; Murray, Royce W. ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 292~301
The synthesis of poly(ether)tailed bipyridine complex as redox reaction probes has advanced attempts to interpret very slow diffusion and heterogeneous electron transfer. Diffusion coefficients as low as
have been observed for the oxidation of neat
electrolyte. Heterogeneous electron transfer rate constants of materials were found to vary with diffusion coefficient. The decrease in k as the diffusion coefficient decreases was actually caused by the decreasing D. Diffusion coefficient for compound of strong ion pairing anion(
) was much smaller than the diffusion coefficient for compound of weak ion pairing anion(
Effects of Heat Treatment on Damping Characteristics of Fe-Al Alloys
Lee, J.H. ; Kim, K.J. ; Kim, D.K. ; Lee, K.H. ; Shin, M.C. ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 302~309
Fe-5.7%AI-1.1%Cr-0.5%Si damping alloys containing 0%C and 0.12%C were heat-treated at
for an hour and then cooled by using some different methods. The damping behaviors of these alloys were observed by optical microscopy, X-ray diffraction and a specific damping capacity(SDC) test. Effect of cooling method on microstructures and the internal stresses of these alloys were negligible while the damping capacity of these alloys was considerably deteriorated by water quenching. The (200) texture was mainly developed by water quenching while the (110) texture by furnace cooling. These results were interpreted by the magnetization behaviors of the ferromagnetic
ferrite. The easy axis of magnetization in <100> direction means that <100> axis has more
magnetic domain walls than
magnetic domain walls were more formed by water quenching, which deteriorated the damping capacity of these alloys. Consequently, the amount of magnetic domain walls giving good damping capacity became less so that the damping capacity was poor in water quenching.
Extraction of Minerals and Elimination Effect of Heavy Metals in Water by Korean Quartz Porphyry
Hwang, Jinbong ; Yang, Miok ; Kim, Mina ; Park, Sunghoon ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 310~319
According to the element analysis of Korean Quartz Porphyry, the ignition loss related to porosity was 7.03, 3.36, 2.09 and 0.73% in the order of Suanbo, Yeachen, Angang and Kyongsan. Extraction of minerals in deionized water and elimination effect of heavy metals in water by Quartz Porphyry were examined. When the Quartz Porphyry of the Suanbo, Yeachen of 0.5~2.0% concentration and the Quartz Porphyry of the Angang of 1.5% concentration were immersed and stirred in deionized water for 3 hours at 180rpm, various minerals concentration of the all stirred water were suitable for potable water. But Quartz Porphyry of the Yeachen was not suitable for potable water because of excess extraction of iron. The elimination rate of lead in single solution was 99% by Quartz Porphyry of the Suanbo, Yeachen and Angang of 3% concentration, Cadmium by Quartz Porphyry of the Suanbo of 7% concentration was eliminated about 98% in 1 hour. The copper was significantly eliminated in Quartz Porphyry of low concentration. Especially in Quartz Porphyry of Angang at 0.4% concentration, the rate of ion exchange was 99% in 4 hours. But elimination effect of arsenic in water by Korean Quartz Porphyry was very low.
Dynamic Range in the Simultaneous Analysis of Pesticide Priority Pollutants on Mass Spectrometer
Lee, Seung-Seok ; Lee, Sueg-Geun ;
Analytical Science and Technology, volume 9, issue 3, 1996, Pages 320~324
The dynamic range of mass selected detector, which is very popular recently because of the simplicity and cheap price, was determined by using priority pollutants. The applied priority pollutants were four pesticides, 4,4'-DDE and 4,4'-DDD, which show the sharp peaks, and
-endosulfan, which show the broad peaks in SIM Chromatogram. The dynamic range of the 4,4'-DDE and the 4,4'-DDD was
. The broad peaks of the
-endosulfan resulted in
of dynamic range.