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김연두,배준현,전천석 충남대학교 자연과학연구소 1984 忠南科學硏究誌 Vol.11 No.2
The method burning completely the sulfur, by using the vanadium pentoxide in a current of the oxygen free of the sulfur dioxide, is employed to form sulfur trioxide. The sulfur trioxide in this gas mixture is absorbed by hydrogen peroxide solution and then converted to sulfuric acid. The sulfur is determined by titrating the sulfuric acid with standard sodium hydroxide solution after eliminating the carbon dioxide on warming.
金然斗,文炳淳,朴暎淳,金世吉 圓光大學校 韓醫學硏究所 1994 원광한의학 Vol.4 No.1
The present experiment was designed to investigate the effects of Dodamtang(導痰湯) on the hyperlipidemia and intravasculr coagulation induced rabbits. In order to control the precise condition, the experimental rabbits were sypplied with calorie limited food. The hyperlipidemia was induced by oral administration of cholesterol(500㎎/㎏) for 4weeks and the intravascular coagulation was induced by indotoxin injection(0.15㎎/㎏). The therapeutic effects of Dodamtang (250㎎/㎏ and 500㎎/㎏) on the lipid metabolism, histological changes of fat deposition in tissues, and the FDP were studied. The results were summurized as followings : 1. The food efficiency rate was decreased significantly with the increased concentration of Dodamtang. 2. The concentration of the serum glucose and total lipid decreased significantly with the increased concentration of Dodamtang. 3. The arteriosclerosis index for phospholipid (triglyceride/phosphokipid) decreased with the increased concentration of Dodamtang. 4. The concentration of the serum total cholesterol, free cholesterol and the arteriosclerosis index for HDL-cholesterol(LDL, VLDL-chloesterol/HDL-cholesterol) decreased with the increased concentration of Dodamtang. 5. The concentration of the serum total protein decreased significantly with the increased concentration of Dodamtang, however, the metabolic rate of albumin/globulin increased with the increased concentration on Dodamtang. 6. The concentration of the serum creatinine decreased significantly with the increased concentration of Dodamtang. 7. The activities of GOT, GPT, and LDH decreased significantly with the increased concentration of Dodamtang. 8. The fat deposition in tissues decreased significantly with the increased concentration of Dodamtang. 9. The concentration of FDP decreased significantly with the increased concentration of Dodamtang. According to the above results, Dodamtang is assumed to have a curative effects against hyperlipidemia and intravascular coagulation.
U_(3)O_(8)의 酸溶出에 미치는 酸化鐵 (Ⅲ) 의 影響
金演斗 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.2
This paper discusses extracting Uranium from U_(3)O_(8) by an oxidzing leach with dilute sulfuric acid. Leaching tests show that the dissolutionrates improve as the Fe_(2)O_(3) is increased-approximately 40 percent o f the uranium is extracted by leaching for 5 hours at 40℃ with 1.84 persent sulfuric acid, under the same conditions the iron(Ⅲ) oxide ranges up the solubilily of U_(3)O_(8) to 57 persent.
金演斗,李弘,千光鉉 충남대학교 자연과학연구소 1978 學術硏究誌 Vol.5 No.2
Degrees of acid attack to low carbon steels and nitrited steels have been measured in hydrochloric acid solutions. The former shows higher resistance compared to the latter in same experimental conditions.
전해분석법에 의한 광석중 Nickel의 정량에 관한 연구
金演斗,裵埈鉉 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2
The undesirable impurities such as iron cobalt and copper interfere the electrogravimetric determination of nickel from the ores by the depositing theses species on the platinum cathode at same time. To solve this problem, the separation of them with the liquid anion exchanger, Amberlite LA-1, has been attempted. The selective and quantitative result of determination of nickel was obtained by extracting them with 50ml of 5% Amberlite LA-1-Xylene in the concentrated hydrochloric acid solution of the nickel ore.
분광 광도법에 의한 광물중 Nickel정량에서의 Amberlite LA-1의 이용
김연두,김종우,최기영 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2
In the selective an quantitative determination of nickel by the dimethylglyoximate complexation from the ores, the undesirable impurities such as iron, cobalt and copper interfere the separation by forming the oximate complexes. To solve this problem, the extraction of these species with the liquid anion exchanger, amberlite LA-1, has been attempted. Nickel was completely separated with dimethylglyoxime in aqueous phase from the sample containing iron, aluminum, chromium, cobalt, copper, zinc and nickel after treating it with 50 ml of 5% amberite LA-1-xylene and the concentrated hydrochloric acid solution.
키레이트 滴定法에 의한 물중 칼슘, 마그네슘 定量에 있어서 Amberlite LA-2의 利用
김연두,배준현,김학수 충남대학교 1985 忠南科學硏究誌 Vol.12 No.2
This study is on the determination of calcium and magnesium in water at very low concentration. Iron(Ⅲ) was added to the sample, and calcium and magnesium were precipitated with iron by adding sodium carbonate and ammonia water. The precipitates were dissolved in conc-HCI and then Fe(Ⅲ) was removed by extraction with Amberlite LA-2. The residual aqueous solution containing calcium and magnesium were determined. Calcium and magnesium are determined by EDTA method respectively after separating them with sodium oxalate. This method, showing the small average relativity of error (less than 3.0%), is very useful to determine low concentration of calcium and magnesium in the water.
저농도 황산용액에서 바나듐 용출에 미치는 NaHSO_3, FeSO_4의 영향
金演斗,趙萬衡 충남대학교 자연과학연구소 1981 忠南科學硏究誌 Vol.8 No.2
In this study, a leaching process of vanadium from V_2O_5 the extraction technique of it with amberlite LA-2-Xylene solution was developed. In the leaching and extraction system, the effects of the operation parameters such as the concentration of the acid, the reductant, and the leaching time and temperature were investigated. The yield of vanadium in this recovery process was evaluated to be 78% on leaching it on 0.6% sulfuric acid solution with either sodium hydrogen sulfite or ferrous sulfate for 5 hours.
金演斗,朴茂淳 충남대학교 자연과학연구소 1978 學術硏究誌 Vol.5 No.1
The spectrophotometric determination of trace level of molybdenum in steels has been improved by modification of reduction system in the thiocyanste method. Ascorbic acid is used to reduce ferric ion to ferrous ion prior to addition of tin(Ⅱ) chloride solution. The ascorbic acid-tin(Ⅱ) chloride system exhibits better results than tin(Ⅱ) chloride alone when preconcentration of molybdenum-thiocyanste complex into methyl isobutyl ketone.