Determination of the Formation Constants of Metal Complexes with Organic Acids by Adsorption Method

제원목,Jae, Won-Mok Korean Chemical Society 1971 대한화학회지 Vol.15 No.4

The adsorption method for the determination of the formation constants of the metal complexes with organic acids was developed by using membrane filters. The adsorption method involved the measurements of radioactivities of the adsorbed metal on membrane filters and the filtrate solution after the radioactive metal ion were filtered through membrane filters in the presence of organic ions of varying concentration. Comparing the adsorption method with the ion exchange method, it was seen that the adsorption method was simpler and faster than the ion exchange method. As an example of the metal complex with organic acid yttrium citrate complex was chosen, and the formation constant of the complex obtained by the adsorption method showed $K_f=2.0{\times}10^{-4}(l. mole^{-1})$ at a pH of 7. Also the present study revealed that the carrierfree state of yttrium in aqueous solution was present in the completely ionized state.

100mc $Am^{241}-Be$ 中性子源에 依한 망간鑛의 射化分析

제원목,유득수,Jae, Won Mok,You, Deuk Soo 대한화학회 1972 대한화학회지 Vol.16 No.6

Studies on Carrier-Free Silver-111 with Membrane Filters

제원목,Jae, Won-Mok Korean Chemical Society 1973 대한화학회지 Vol.17 No.5

무단체 Ag-111의 상태를 여과법에 의하여 연구하였다. 이 연구는 막여과자에 의하여 수용액에 있어서 Ag-111의 pH 및 농도변화에 대한 효과를 조사하였다. 이 연구결과 막여과지에 대한 Ag-111의 부착은 Freundlich 흡착 등온식에 따르고 Ag-111의 흡착상태는 AgOH 형태로 존재하며 높은 pH에서 흡착성이 없는 $Ag(OH)_{2}-$는 Ag의 흡착을 방해하는 것으로 생각된다. 또한 무단체 Ag-111는 수용액중에서 $Ag^+$상태로 존재하고 있다. The state of carrier-free silver-111 has been studied by applying filtration method. The studies involved that the effects of pH and concentration of silver-111 in aqueous solution have been determined with membrane filters. The present studies revealed that the retainment of silver-111 on membrane filters followed Freundlish adsorption isotherm, and the adsorbed state of silver-111 was present in the form of AgOH. Also it was supposed that the formation of the non-adsorbed hydroxide of$Ag(OH)_{2}-$ may prohibit the existance of AgOH at higher pH, and it seems to be valid that the carrier-free silver-111 in aqueous solution exists in$Ag^+$state.

Adsorption Kinetics of Carrier-Free Yttrium-90 on Membrane Filters

제원목,Won Mok Jae Korean Chemical Society 1972 대한화학회지 Vol.16 No.1

The adsorption kinetics on a membrane filter have been studied by an introduction of acid or alkali in yttrium-90 solution. The change of the adsorption in the filtration process was determined by the filtrate activities with using a microsyringe filter holder connected with a syringe. The over all reaction rate obeyed a reversible first order reaction, and the rate constants thus obtained, showed the values of $k_1$ = 0.12 $sec^{-1}$ and $k_1'$ = 0.039 $sec^{-1}$. As a result of the present studies, it would be reasonable that the rate determining step of the adsorption reaction was the hydrolysis reaction of the adsorbed yttrium ions.

Studies on Carrier-Free Yttrium-90 with Membrane Filters

제원목,Jae, Won-Mok Korean Chemical Society 1970 대한화학회지 Vol.14 No.4

The state of carrier-free yttrium-90 has been studied by filtration method with membrane filters. The studies include the adsorption ratio of carrier-free yttrium-90 on membrane filters by the change of PH, concentration of yttrium-90, and the pore size of member filters. The adsorption followed to Freundlich adsorption isotherm. The adsorption mechanism was proposed by the adsorption of transient state as an ionic form of $Y^{3+}$, and the experimental results were explained satisfactorily by the proposal. The adsorbed state of yttrium was present in the forms of yttrium such as $Y^{3+},\;Y(OH)^{3+},\;Y(OH)^{2+},\;Y(OH)^+_3,\;and\;Y(OH)_3$,and the existing ratios of the forms of yttrium were sharply changed by PH. It seems to be valid tha the carrier-free yttrium-90 exists mostly in $Y^{3+}$ state.

우라늄계열(系列) 비평충(非平衝) 연대측정법(年代測定法)과 한반도(韓半島) 남해(南海) 상백도(上白島) 현생(現生) 퇴적층(堆積層)의 연대측정(年代測定)에 관(關)한 연구(硏究)

제원목,이철,박긍식,주승환,Jae, Won Mok,Lee, Chul,Park, Keung Shik,Choo, Seung Whan 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.3

Uranium-thorium separation technique from shallow sediment and ${\alpha}$-source electrodeposition technique are established in the present work, and uranium series disequilibrium dating method is applied to the quaternary piston core from Sangback-do, South Sea of Korean Peninsula. The age of the piston core (depth 200~300cm) sampled from Latitude $34^{\circ}06^{\prime}37^{{\prime}{\prime}}$, Longitude $127^{\circ}37^{\prime}37^{{\prime}{\prime}}$ was determined as ranging from $9.0{\pm}2.2$ to $22.9{\pm}3.3$ Ky B.P, i.e., Later Pleistocene, older than Holocene which was stratigraphically known in the previous study. The sedimentation rate in the area is regularly increased according to the depth of the sedimentation layer. Except a few split sections of the piston core the sedimentation rates are avarage 7.2cm/1,000 years. Where sedimentation layer is deeper, then sedimentation rate tend to be slower. It must be pointed in age calculation that initial $^{230}Th/^{234}U$ radioactivity ratio is much influenced when detrital material was introduced in the sample. The $^{230}Th/^{234}U$ activity ratio measured in the present work is 0.06 at $^{232}Th=0$, and this value shows higher analytical errors because of the low· radioactivity of $^{230}Th$ in the samples.

중성자 방사화분석에 의한 조선시대 청·백자 분류연구

姜炯台,李澈,諸元穆 漢陽大學校 環境科學硏究所 1989 環境科學論文集 Vol.10 No.-

조선시대 자기의 특성화를 위하여 중성자방사화분석법으로 15개의 미량성분원소 (Sm,Ga,K,La,Ce,Yb,Th,Hf,Na,Cs,Sc,Rb,Fe,Co,Eu) 함량을 결정하였다. 데이타의 수학적 처리법으로서 선형판별식분석법을 사용하였다. 이 선형판별식분석법으로서 자기의 분류에 유용한 변수를 선정한 다음 재차 선형결합방식으로 분류규칙을 구하였다. 판별점수로서 평면상에 도시한 결과 경기도 광주군 상번천리5호, 상번천리9호 및 도수리 청·백자의 분류효율은 각각 12/15,15/15,10/10이었다. Data on the concentration of Sm,Ga,K,La,Ce,Yb,Th,Hf,Na,Cs,Sc,Rb,Fe,Co and Eu obtained by neutron activation analysis have been used to characterize Korean porcelain by multivariate analysis. A combination of analytical data by means of statistical linear discriminant analysis(SLDA) has resulted in removal of redundant variables, optimal linear combination of meaningful variables and formulation of classification rules. The plot in the first-to-second discriminant scores has shown that the three distinct territorial regions exist among porcelains of Kyungkido Sangbunchulli No. 5, Sangbunchulli No. 9 and Dosuri, with respective efficiencies of 12/15,15/15 and 10/10.

몰리브도 인산암모늄에 의한 핵분열 생성물의 분리

제원목,도규식 漢陽大學校 環境科學硏究所 1990 環境科學論文集 Vol.11 No.-

합성 무기이온교환체인 AMP에서 Cs-137, Ce-141 그리고 Co-60의 이온교환능을 합성 유기이온교환체인 Dowex-50과 천연 무기이온교환체인 Bentonite에서의 그것과 비교하였다. 각 이온교환체에 대한 흡착계수(Kd)는 회분식실험(Batch experiment)으로부터 얻어졌다. 본 실험은 첫째, 교반시간에 대한 Kd값 둘째, 질산농도 변화에 대한 Kd값 마지막으로 Co, Cs, Ce의 각각의 농도변화에 따른 Kd값의 변화를 측정하였다. 교반시간에 따른 Kd값은 3.5cm stroke shaker를 사용해서 분당 290회의 shaking을 했을 때 대부분의 경우 1-4hrs에서 평형상태에 도달하였다. 질산의 농도에 따른 Kd값은 AMP, Dowex 50에 있어서 ??mol/l 이하의 농도에서 거의 일정해졌으며 Bentonite는 ??mol/l 이하에서 같은 현상을 보였다. Co, Cs, Ce의 농도 변화에 따른 흡착계수는 ??-??mol/ㅣ에서는 거의 일정하게 나타났으며 ??mol/l 이상의 고농도에서는 각각의 이온에 대한 흡착계수가 점차 감소하는 경향을 보였다. The ion exchange behavior of some typical fission products such as Cs-137 and Ce-141 and corrosion product, Co-60 on synthetic inorganic ion exchanger, Ammonium Molybdophosphate, was studied and compared with that on synthetic organic ion exchanger, Dowex-50 and natural inorganic ion exchanger, Bentonite. Distribution coefficient on each exchanger was obtained from batch experiment. To study concentration effects of Co-60, Cs-137 and Ce-141, the optimal shaking time and optimal concentration of HNO₃ solution were predeterminded. In general, Kd value has a tendency to decrease at higher concentration than 10??Mol/l of each metal solution, and AMP has a better adsorbability for Cs?? at relatively low concentration than other exchangers.

금속도금공장 폐수중의 구리 및 시안화물의 효과적인 처리방법

諸元穆,洪鍾斗,金冕燮 漢陽大學校 環境科學硏究所 1988 環境科學論文集 Vol.9 No.-

구리 및 시안화물이 혼합된 도금폐수를 적절하게 처리하는 방법을 알기 위하여 pH,농도 및 접촉시간에 따르는 용액중 구리 및 시안화물의 제거율을 실험하였다. 그 결과 시안화물은 5% NaOC1용액으로 처리하면 잔류시안 농도가 0.03 ㎎/ℓ이하로 환경배출기준에 적합하였다. pH에 따르는 영향은 pH8 이상에서 99%제거율을 나타냈다. 구리혼합용액은 중화침전법으로 실험한 결과 pH8에서 99%가 짧은 시간에 제거되었다. 시안화물과 구리혼합용액의 pH에 따르는 제거율은 pH8 및 11에서 높은 제거율(95%이상)을 보였으며 pH10에서 제거율이 떨어지는 결과를 얻었다. To investigate the effective removal method of copper and cyanide compounds in metal plating waste water, removal ratio of copper and cyanide compounds in solution are measured with varying pH, concentration and contact time. As results of the present expriment, cyanide compounds in the solution are removed to 0.03 ㎎/ℓ or less with 5% NaOC1 solution. The present result is satisfied to environmental disposal standards. The removal ratio against pH values show 99% over pH8. As results of neutral precipitation method, copper including solution are removed to 99% at pH8 in short time. The removal ratios of cyanide mixed copper solution against pH values show high efficiency(over 95%) at pH8 and 11 and removal ratios are decreased at pH10.

環境放射線測定의 現況

諸元穆 漢陽大學校 環境科學硏究所 1982 環境科學論文集 Vol.3 No.-