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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
Editor in Chief :
Volume & Issues
Volume 11, Issue 6 - 00 1998
Volume 11, Issue 5 - 00 1998
Volume 11, Issue 4 - 00 1998
Volume 11, Issue 3 - 00 1998
Volume 11, Issue 2 - 00 1998
Volume 11, Issue 1 - 00 1998
Selecting the target year
SPF Measurement and Cytotoxicity of Sunscreen Agents in Cosmetic
Kim, In-Young ; Kang, Sam-Woo ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 79~87
Consumers have recently preferred to purchase extensive UV intercepting products, which are waterproof and free from side effects on skin. During the testing of cytotoxicity (in-vitro) in neutral red (NR) method, cell survival ratio of UV-B interceptors decreased to just above 0.08 w/v%, and it was observed that the UV-A interceptors the ratio also decreased to just above 0.06 w/v%. In addition patch-tests of inorganic UV interceptors resulted in no skin irritation even below 10.0 and 11.25. In absorption curves, UV-B was most suitable for octyl methoxycinnamate (OMC) and UV-A for butyl methoxy dibenzoylmethane (BMDM). For this reason,
UVA/UVB the material of OMC and BMDM coated with Nylon & polyethylene, was used as the organic UV interceptor. Zinc oxide (ZnO) and titanium dioxide (
) was used as inorganic UV interceptors. The appropriate mixture ratio of ZnO and
was 6 to 4:6% of ZnO, 4% of
and 5% of
UVA/UVB were all combined and added to our sunscreen cream. The SPF value of in-vitro was 38.9. In practical application, each sun protection factor (SPF) duration of oil-in-water (O/W) emulsion and water-in-silicone (W/S) emulsion containing sunscreen cream of the same content showed that W/S type of sunscreen cream was 5 times as durable as the other. Therefore, this product is fit for use in swimming, climbing or skiing. This research is to minimize skin trouble caused by UV interceptors and to make one with proper softness, skin safety and UV intercepting efficiency.
Bromide Concentration in Human Biological Samples Intoxicated by Methylbromide
You, Jae-Hoon ; Lee, Sang-Ki ; Jin, Kwang-Ho ; In, Sang-Wban ; Yoo, Young-Chan ; Park, Sung-Woo ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 88~91
) was separated and quantified with
by Ion Chromatography. Bromide was eluted at 8.9 min. and the detectetion limit was 2.5 ng. We compared with bromide concentration in normal or methylbromide intoxicated bloods and tissues. Bromide concentrations were 2.0~5.8 ppm in normal bloods and 1.0~5.3 ppm in normal tissues. In fatal cases of methylbromide intoxication, blood bromide concentrations (4 cases) of 74.2~139 ppm and tissue bromide concentration (1 case) of 76 (heart)~201 (lung) ppm were detected. In fatal cases, blood bromide concentrations. were 12~22 times higher than those of normal bloods.
Thermal Stability and Deintercalation of K-synthetic Graphite Intercalation Compounds at Elevated Temperatures
Oh, Won-Chun ; Lee, Young-Hoon ; Ko, Young-Shin ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 92~95
K-SGICs(synthetic graphite intercalation compounds) were synthesized in a modified two-bulb pyrex tube. The pressure in the two-bulb tube was maintained at approximately
torr for the reaction of potassium and graphite. Deintercalation process of the K-SGlCs obtained by the modified method was heat-treated by keeping in liquid paraffin between
. The thermal stability and the temperature dependence of the K-SGICs were characterized using differential scanning calorimeter(DSC) analyzer. Enthalpy and entropy for K-SGIC formations were calculated by confirming the deintercalation and thermodynamic exothermic reactions depending on the various temperatures. The structure changes and thermal stability of K-SGICs during the deintercalation reaction of potassium ions and the interlayer spaces of the synthetic graphite were identified by X-ray diffraction(XRD).
Development of a Multi - channel Detector for Capillary Electrophoresis System
Hong, Seung Guk ; Kim, Hai-Dong ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 96~104
A photodiode array multichannel detector system for capillary electrophoresis was developed. The photodiode array detector for capillary electrophoresis (CE-PDA) has 1024 photodetectors and can analyze sample by measuring UV/VIS absorption spectrum in 275~675 nm wavelength range. The CE-PDA instrument can get a spectrum in 30 ms during sample separation and can be programmed by a PC to control various experimental conditions required for sample analysis. The performance of the multichannel CE-PDA instrument was tested using L-ascorbic acid and alizarin yellow GG mixture. The reproducibility test of the CE-PDA system showed 5.6% RSD.
The Study on the Biodegradability and Phosphate, Heavy Metal Contents of Shampoos and Powder Detergents for Clothing
Ko, Young-Shin ; Kim, Se-Kyong ; Lim, Jong-Wan ; Rhu, Chan-Joo ; Choi, Sung-Yong ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 105~111
The biodegradabilities of surfactants were measured for shampoos and powder detergents for clothing(six kinds of each) in domestic market at present. Also the phosphates that cause of eutrophication and heavy metals to have a direct effect on human body were measured. Analysis results show that though they all come up to KS(Korean Industrial Standards), samples containing plenty of sodium
-olefin sulfonate(AOS), linear alkyl benzene sulfonate(LAS) and synthetic sodium lauryl etoxylate sulfonate (SLES) have the lower biodegradability than the others. It was found that these samples were petroleum surfactants, and the lower biodegradability than surfactants extracted naturally. The contents of phosphates and heavy metals in the samples were under the regulation limits for the cosmetic standards.
The Study of Fast X-ray Fluorescence Analysis Using a SSQ Program
Park, Yong Joon ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 112~119
A Siemens SemiQuant (SSQ) 3000 program, a precalibrated 'standardless' analytical program handling up to 90 elements, was evaluated for the fast analysis of various types of reference materials using a wavelength dispersive X-ray spectrometer. Various types of standard reference materials such as metal discs, metal chips, and geological materials in powder form were analysed and it took 23 minutes of measuring time for 75 elements. Measurements of geological reference materials using different sampling methods were carried out and their data were interactively evaluated. The analysis of materials of a known matrix concentration such as stainless steels provided higher precision value compared to totally unknown samples. The analyses of materials prepared as pressed pellets or fused glass beads provided higher precision values compared to the measurement of loose powders with a foil on the sample surface and helium operation, though their sampling procedures were more complicate and took more time. Since very light elements such as boron, carbon, and oxygen have a strong influence on the matrix effects and also on the calculation of effective matrix corrections, the rhodium Compton check was applied to verify the reliability of the defined light element concentrations of light matrix materials and the defined major sample compounds. Failure of defining correct matrix resulted in an unoptimized matrix correction and therefore in the wrong calculation of the element concentration.
Determination of Germanium in Spring Waters by Inductively Coupled Plasma Mass Spectrometry
Park, Kyung Su ; Song, Seong Yeon ; Shim, Ue Sup ; Kim, Sun Tae ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 120~124
A rapid and accurate determination method of ultra-trace amounts of germanium in spring water by ICP-MS has been developed. Mass number 74 was not only the best mass but also the smallest mass interference. Only 30% of water samples contain germanium more than
, and a few of them has organogermanium species.
Tarnish Behavior of Palladium-Indium-Silver alloy
Kim, Hwa-Soo ; Kim, Seong-Yun ; Lee, Kyu-Hwan ; Shin, Myung-Chul ; Dzo, Man Hyung ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 125~129
The purpose of this study was to give a quantitative analysis for assessing the tarnish resistance of alloys at the artificial saliva, 0.9% NaCI solution and Ringer's solution. In light of development in low-nobility alloys, it is important that tarnish test is standardized to analyse the tarnish properties of the compositions. There are concerns with the long term chemical stability of these alloys and the resistance to tarnish. Chemical stability is a complex problem involving alloy composition, nobility, microstructure and environment.
Analysis of Polyamine Transport of Young Spring Radish Cotyledons
Cho, Bong-Heuy ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 130~134
Polyamines were analyzed in young cotyledons of spring radish. The uptake rate of SPD were transported within 20 min lineary and reached the saturation phase after 1hr. The uptake rate of SPD decreased gradually with the time by the increasing amount of SPD inside the cells. The uptake of PA depends on the external pH. The optimal pH of PA uptake are pH 7.5.
values depend on external pH also. The uptake rate of PA was inhibited by external KCI, which depolarized membrane potential in the cells.
Analysis of the Change of Amino Acids by Cadmium and Polyamine-Treatment in Spring Radish Young Cotyledons and Roots
Cho, Bong-Heuy ; Park, Sun Young ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 135~138
The change of amino acids was analysed with cotyledons and roots of young spring radish by the treatment of
ion plus PA. The concentration of Asp was decreased by the treatment of
ion, but Ala, Phe, Val, Ile, Typ, Lys and Arg was increased in the cotyledons. The concentration of Lys and Arg was decreased by the treatment of
ion plus PA at the same time. The concentration of basic amino acids, His, Lys and Arg was increased by the treatment of
ion, and decreased by the treatment of
ion plus PA in the roots. Only the concentration of Pro was increased by the treatment of
ion plus PA. This results showed that Pro was induced against stress of PA, and assumed that the change of other amino acids concentration may be relation to the metabolism against stress.
Simple Analytical Method for Acrylamide in the Workplace Air Adsorbed by Charcoal Tube
Yang, J.S. ; Lee, M.Y. ; Park, I.J. ; Kang, S.K. ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 139~144
For the ambient monitoring of acrylamide, the adequate condition of sampling and analysis was checked. The adequate adsorbents and desorption solvents were tested. The combination of charcoal tube as a adsorbent and acetone as a desorption solvent showed 87% desorption efficiency. Flame ionization detector was used to detect acrylamide. The detection limit was 0.814 mg acrylamide in 1 L acetone. It is the equivalent concentration of 0.0203 mg acrylamide in
air if the volume of air collected was 40L. The permissible exposure level (PEL) of acrylamide in the workplace air recommended by Occupational Safety and Health Administration (OSHA, USA) is 0.3 mg acrylamide in
air. So, it is very simple and economic analytical method for acrylamide to be set in the industrial hygiene laboratories.
Stability Constants for Co(II) and Zn(II) of Multidentate N,O-Schiff Base Ligands in Dioxane-Water Mixtures
Kim, Sun-Deuk ; Kim, Jun-Kwang ; Lee, Sung-Woo ;
Analytical Science and Technology, volume 11, issue 2, 1998, Pages 145~149
Stability constants for the complexes of multidentate N,O-Schiff base ligands (bis-(salicylaldehyde)ethylendiamine(SED), bis-(salicylaldehyde)propylendiamine(SPD), bis-(salicylaldehyde)diethylenetriamine(SDT), bis-(salicylaldehyde)triethylenetetraamine(STT), and bis-(salicylaldehyde)tetraethylenepentaamine(STP) with Co(II) and Zn(II) were determined by a potentiometric method in a 70% dioxane-30% water mixture and ethanol, respectively. Stability constants for the complexes increased in the order of SPD