Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Volume & Issues
Volume 52, Issue 6 - Dec 2008
Volume 52, Issue 5 - Oct 2008
Volume 52, Issue 4 - Aug 2008
Volume 52, Issue 3 - Jun 2008
Volume 52, Issue 2 - Apr 2008
Volume 52, Issue 1 - Feb 2008
Selecting the target year
Effects of Butanol Isomers on the Mixed Micellization of TTAB/Brij 35 Mixed Surfactant Systems
Gil, Han-Nae ; Lee, Byung-Hwan ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 111~117
DOI : 10.5012/jkcs.2008.52.2.111
critical micelle concentration (CMC) and the counter ion binding constant (B) in a mixed micellar state of the trimethyltetradecylammonium bromide (TTAB) with the polyoxyethylene (23) lauryl ether (Brij 35) at 25oC in water and in aqueous solutions of butanol isomers were determined as a function of 1 (the overall mole fraction of TTAB) by the use of electric conductivity method and surface tensiometer method. Various thermodynamic parameters (Xi, i, Ci, aiM, and Hmix) were calculated by means of the equations derived from the nonideal mixed micellar model. The results say that the effects of butanol isomers on the micellization of TTAB/Brij 35 mixtures have been in the order of n-butanol>iso-butanol>t-butanol> water.
The Study of Doxorubicin and its Interaction with Adenine by UV-Resonance Raman Spectroscopy
Lee, Chul-Jae ; Jung, Maeng-Joon ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 118~123
DOI : 10.5012/jkcs.2008.52.2.118
The interaction of the antitumour agent, doxorubicin, with adenine is investigated in an aqueous solution at a concentration of 10-3~10-4 with volume ratios of 1:2. A UV-resonance Raman spectroscopy and surface enhanced Raman spectroscopy are used to determine the binding sites of doxorubicin to adenine and the structural variations of doxorubicin-adenine complexes in an aqueous solution. We identified that the possibilities of doxorubicin interacted with the N7 positions of adenine.
The Inhibition of C-steel Corrosion in H
Solution by Some Furfural Hydrazone Derivatives
Fouda, A.S. ; Badr, G.E. ; El-Haddad, M.N. ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 124~132
DOI : 10.5012/jkcs.2008.52.2.124
effect of some furfural hydrazone derivatives (I -V) as corrosion inhibitors for C-steel in 3M H3PO4 solution in which M indicates mol/l has been studied using weight-loss and galvanostatic polarization techniques. A significant decrease in the corrosion rate of C-steel was observed in the presence of the investigated compounds. This study revealed that, the inhibition efficiency increases with increasing the inhibitor concentration, and the addition of iodide and thiocynate ions enhances it to a considerable extent. The effect of temperature on the corrosion behavior of C-steel was studied in the range from 30-60oC with and without 510-6 M investigated compounds using weight-loss method. Apparent activation corrosion energy (Ea*) and other thermodynamic parameters for the corrosion process were calculated and discussed. The polarization measurements show that the investigated compounds act as mixed-type inhibitors, but the cathode is more polarized when an external current was applied. The adsorption of these compounds on the surface of C-steel in 3M H3PO4 obeys Frumkins adsorption isotherm. The mechanism of inhibition was discussed in the light of the chemical structure of the investigated compounds.
Cadmium Extraction from Solutions by Solid-Phase and its Trace Determination
Ashrafi, F. ; Attaran, A.M. ; Kermani, N. Memar ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 133~139
DOI : 10.5012/jkcs.2008.52.2.133
A new sensitive and selective spectrophotometric method for determination of trace amounts of cadmium using a polyvinyl chloride membrane containing bis-(2-ethylhexyl)phthalate as a solid phase extraction medium was investigated. Bis-(2-ethylhexyl)phthalate has used as a plasticizer. Cd(II) in an aqueous solution was trapped on the membrane in the form of colorful Cd (II)-I- - MG complexes (which MG is malachite green) and the cadmium complex was concentrated in the membrane. The absorbance of the green membrane was measured at 629 nm using a spectrophotometer, and then, the concentration of the cadmium was calculated using a calibration curve, which expressed the relationship between the Cd(II) concentration and the membrane absorbance after coloring for 25 min. The calibration curve was linear in the range of 10-760 μgL-1 cadmium in the test solution. The detection limit based on the 3Sbl criterion was 1.8199 μgL-1 and the relative standard deviations (RSD) were less than 4 % (n=5). The proposed method has been successfully applied to the determination of trace amounts of cadmium in the Tadjan River water sample (Sari-Iran), and the mean value of 28.7 μgL-1 was obtained.
Preconcentration of Ultra Trace Amounts Bismuth in Water Samples Using Cloud Point Extraction with Na-DDTC and Determination by Electrothermal Atomic Absorption Spectrometry (ET-AAS)
Moghimi, Ali ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 140~147
DOI : 10.5012/jkcs.2008.52.2.140
.A new approach for a cloud point extraction-electrothermal atomic absorption spectrometric method was used for determining bismuth. The aqueous analyte was acidified with sulfuric acid (pH 3.0-3.5). Triton X-114 was added as a surfactant and natriumdiethyldithiocarbaminat (Na-DDTC) was used as a complexing agent. After phase separation at 50oC based on the cloud point separation of the mixture, the surfactant-rich phasen was diluted using tetrahydrofuran (THF). Twenty microliters (20 L) of the enriched solution and 10 l of 0.1% (w/v) Pd(NO3)2 as chemical modifier were dispersed into the graphite tube and the analyte determined by electrothermal atomic absorption spectrometry. After optimizing extraction conditions and instrumental parameters, a preconcentration factor of 195 was obtained for a sample of only 10 mL. The detection limit was 0.04 ng ml-1 and the analytical curve was linear for the concentration range of 0.04-0.70 ng mL-1. Relative standard deviations were <5%. The method was successfully applied for the extraction and determination of bismuth in water samples.
Preconcentration and Determination of Copper(II) Using Octadecyl Silica Membrane Disks Modified by 2-Propylpiperidine-1-carbodithioate and Flame Atomic Absorption Spectrometry
Moghimi, Ali ; Mossalayi, Haydar ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 148~154
DOI : 10.5012/jkcs.2008.52.2.148
A simple and fast method for extraction and determination of trace amounts of copper(II) ions using octadecyl-bonded silica membrane disks modified with 2-propylpiperidine-1-carbodithioate (PPCD)I and atomic absorption spectrometry (AAS) is introduced. Extraction efficiency and the influence of flow rates, pH, and type and smallest amount of stripping acid were investigated. Maximum capacity of the membrane disks modified with 2 mg of the anthraquinone derivative used was found to be 425μg Cu2+. The limit of detection of the proposed method is 7 ng/ml. The method is applied to the recovery of Cu2+ from different synthetic samples and a spring water sample.
Preconcentration of Copper(II) Using Mesoporous Organo-Silicas and Determination by Flame Atomic Absorption Spectrometry
Moghimi, Ali ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 155~163
DOI : 10.5012/jkcs.2008.52.2.155
.A simple and reproducible method for the rapid extraction and determination of trace amounts of copper(II) ions using mesoporous organo-silicas mesoporous silica and atomic absorption spectrometry is presented. Common coexisting ions did not interfere with the separation and determination. The preconcentration factor was 100 (1 ml elution volume) for a 100 ml sample volume. The limit of detection of the proposed method is 1.0 ng ml-1. The maximum sorption capacity of sorbent under optimum conditions has been found to be 5mg of copper per gram of sorbent. The relative standard deviation under optimum conditions was 2.8% (n=10). Accuracy and application of the method was estimated by using test samples of natural and synthetic water spiked with different amounts of copper(II) ion.
Synthesis of CaWO
by a Microemulsion Method
Ryu, Eun-Kyoung ; Huh, Young-Duk ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 164~168
DOI : 10.5012/jkcs.2008.52.2.164
CaWO4 crystals were synthesized by a microemulsion method. Various sizes and shapes of CaWO4 were obtained by changing the molar ratio (w) of H2O to CTAB. At w=5 and 10, oval CaWO4 crystals with length of 100 nm and 500 nm were obtained, respectively. At w=20, rod-like CaWO4 crystal with length of 1 μm was obtained. The sphere CaWO4 crystal with length of about 2~3 μm was obtained at w=30. The CaWO4 crystal morphology changes from oval to sphere via a rod by aggregation with increasing the molar ratio of H2O to CTAB.
The Relationship Between Science High School Teachers' Beliefs of Gifted Education and Classroom Practices
Noh, Hee-Jin ; Kim, Dong-Uk ; Paik, Seoung-Hey ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 169~178
DOI : 10.5012/jkcs.2008.52.2.169
This study investigated the relationship between science high school teachers' beliefs of gifted education and classroom practices. The data of this case study were collected from three science teachers who worked in a science high school through qualitative research methods such as interviews and classroom observations. The other various data related to science high school management and the teachers' teaching were collected and analyzed using the constant comparative method. The results of the study are as follows: the teacher of long period in-service experience in science high school had teacher-centered belief, and his classroom practices were matched with his beliefs. The teacher of short period in-service experience in science high school had student-centered belief, and her classroom practices were matched with her beliefs, also. The teacher of medium period in-service experience in science high school had student-centered belief, but her teacher-centered classroom practices were mismatched with her beliefs. From the results, it could conclude that school culture affects on teachers' classroom practices stronger than beliefs. The longer career period of science high school changed easier teachers' beliefs into knowledge education for university entrance examination removed from gifted education. To solve these problems, we suggest the needs of teacher education programs for science high school teachers.
Relationship Between Problem Finding Ability and Problem Solving Ability in Chemistry
Ryu, Si-Gyeong ; Park, Jong-Seok ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 179~185
DOI : 10.5012/jkcs.2008.52.2.179
purpose of this study is to investigate the relationship between high school students' Problem Finding Ability (PFA) and chemistry problem solving ability. To achieve this purpose, the interrelationship between the results of PFA in ill-structured scientific problem situation and the scores of sham examination in chemistry I of College Scholastic Ability Test (CSAT) was analyzed. The results of this study turned out to be as follows: There was correlation (r=.346) between the score of PFA test and that of sham examination in chemistry I of the CSAT. And a little correlation (r=.390) between PFA and students application ability which is one of the sub factors in sham examination of the CSAT. Especially, in the high achievers group there was high correlation (r=.446) between students fluency which is one of the sub factors in PFA, and application ability. This implies that the application ability of high achievers has something to do with their PFA for a variety of problems. As for the PFA between high achievers and low achievers, there was no significant difference (t=.830, p=.411).
Identification of College Students' Understanding of the Thermodynamic Aspects Regarding the Dissolution of Solids and Gases
Park, Jong-Yoon ; Lee, Yun-Hee ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 186~196
DOI : 10.5012/jkcs.2008.52.2.186
purpose of this study was to investigate college students' understanding of the thermodynamic aspects of the dissolution of solids and gases. The subjects were 34 juniors from the Seoul area who answered questionnaires composed of six items which asked the directions and reasons for the changes in enthalpy, entropy, and the solubility by temperature for the dissolution of solid sodium chloride and gaseous carbon dioxide into water. The results showed that the students understanding of the enthalpy change of dissolution was poor: many students answered that the dissolution of solids is an exothermic process because the dissolution occurs when the solute-solvent interaction is greater than the solute-solute interaction; the students also thought that the enthalpy should be reduced for spontaneous dissolution because the spontaneity depends on the enthalpy change only. For the entropy change, the students understanding was better and they explained it according to the meaning of disorder. For the temperature dependence of solubility, most students answered correctly regarding the direction, but only 25% of them explained the reason accounting for the enthalpy change. Many students who answered incorrectly on the enthalpy change could not explain the reason why.
Electrochemical Studies on the Voltammetric Characteristics of Hydrogen Peroxide Biosensor Immobilized by Natural Rubber
Yoon, Kil-Joong ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 197~202
DOI : 10.5012/jkcs.2008.52.2.197
Comparison of Chip-Base Real-Time PCR and Tube-Base Real-Time PCR Methods for Detection of B. cereus
Nam, Youn-Hyoung ; Ahn, Young-Chang ; Park, Su-Min ; Cho, Min-Ho ; Seo, Jae-Won ; Yoon, Il-Kyu ; Park, Sang-Bum ; Kim, Jong-Gyu ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 203~206
DOI : 10.5012/jkcs.2008.52.2.203
A DFT Study on Magnesium Ion Affinity of Glycine
Kwon, Hyuk-Jae ; Lee, Gab-Yong ;
Journal of the Korean Chemical Society, volume 52, issue 2, 2008, Pages 207~211
DOI : 10.5012/jkcs.2008.52.2.207