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ICP-AES에 의한 수중의 금속 산화물 직접분석을 위한 연속흐름 Microwave 용해장치 개발 연구
김연두,이계호,김형승,김동수,박광규,Kim, Yeon Du,Lee, Gye Ho,Kim, Hyeong Seung,Kim, Dong Su,Park, Gwang Gyu 대한화학회 1994 대한화학회지 Vol.38 No.8
수중의 금속 산화물을 신속하고 간단하게 용해시킬 수 있는 연속흐름 마이크로파 용해장치를 개발하였다. 이로서 금속 산화물 입자를 용해시킴과 동시에 유도결합 플라즈마 분광기(ICP-AES)를 이용하여 ON-LINE으로 분석하는 완전 자동화 분석 장치의 개발이 가능토록 하였다. 연속흐름 마이크로파 용해장치는 개방형 튜브 장치와 억제형 튜브 장치로 구분하여 제작하고 최적화 시험을 수행하였다. 개방형 튜브 용해장치의 최적조건은 튜브길이가 30m, 마이크로파 출력 20%, 염산 농도 0.6N, 유속은 3.5ml/min였으며, 억제형 튜브 용해장치는 튜브 길이가 7.2m, 마이크로파 출력 30%, 염산 농도 0.6N, 유속은 3.1ml/min였다. 억제형 튜브 용해장치가 개방형 장치에 비하여 용해시간이 3배 정도 단축되었고 용해시킬 수 있는 시료의 농도 범위도 10배 정도 높았다. 제작된 용해장치의 정밀도는 베치식 용기 용해법과 거의 유사한 결과를 나타내어 Fe, Cu는 5% 정도의 상대 표준 편차값을 나타내었고, Zn,Co는 10%내외로 다소 높게 나타났다. The method described offers rapid and efficient sample preparation using on-line microwave digestion of metal oxides in water sample with direct elemental detection by ICP-AES. The open tubing digestion system(OTD) and the restraint tubing digestion system(RTD) for flow injection(FI) were designed and tested to find the optimum conditions. Comparison of OTD and RTD indicated that RTD was 3 times faster on the digestion time, and 10 times higher on sample mass. Finally, the results of RTD agree well with those by conventional microwave open vessel in all cases and show good precision; Fe and Cu show good with about 5% of RSD, while Zn and Co more or less than 10% RSD.
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.
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.
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.
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.
液狀陰 이온 交換體인 AMBERLITE LA-2와 URANIUM과의 錯이온 形成에 關한 硏究
金演斗,朴茂淳 忠南大學校 1972 論文集 Vol.11 No.-
The method of separation of uranium from monazite using a liquid anion exchanger, Amberlite LA-2 diluted with xylene, was previously reported. In this paper, a study is made on the complex anion formed in the extracted solution by use of Amberlite LA-2 under the presence of the HCI and H_2SO_4. In the case of HCI solution, it was found that the mole ratio of U and Cl ion in the organic phase was approximately 1 : 6. It is thought that the extracted uranium could be the form of (UO_2 Cl_6)^-4. The same principle was applied to the case of H_2SO_4 soultion and the predicted form of the complex ion was (UO_2(SO_4)_4)^-6.
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.
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.
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.