Emission Spectrophotometer와 X-ray Luminescence에 의한 섬진강 유역에 분포한 Monazite Sand중의 희토류 원소들 정량 = Determination for the Rare Earth Elements of Monazite Sands in the Sum Jin River Area by Emission and X-ray Luminescence Spectrophotometry

다국어 초록 (Multilingual Abstract)

Having the monazite of the Sum Jin river area (Joock Gock, Suck Gock and Gwang Chun area) been decomposed with 95%-H_2SO_4 into the sample solution and the sample solution was adsorbed into the Dowex 50W-X8 resin. The fraction of gthe rate earth elements were eluted with ammonia alkaline solution of 0.025M-DTPA (pH=8.2), and the other fraction was eluted with the mixed solution of the 0.025M-DTPA(pH=8.2) and 0.0018M-HEDTA (pH=7.5) in the same volume.
The amount of the oxide of rare earth elements (R_2O_3) in the effluent solution of each fraction was determined, and the amount of the rate earth elements (La, Ce, Sm, Pr, and Nd.), Yttrium and Uranium of the first separated rare earth oxides were measured by spectrophotometry and X-ray Luminescence method.
The results are as follows :
1) The content of R_2O_3 in the monazite sands of Joock Gock area is 57.25% in average, and in case that the particle size of monazite sands is 100-120 mesh, the content of the R_2O_3 is 62.3%.
2) The Optimum condition of sulturic acid decomposition is temperature of decomposition : 250℃, heating time : 2 hrs, the ratio of H_2SO_4 to monazite sands by weight : 1: 2.5.
3) When R_2O_3 adsorbed by cation exchange resin was eluted with DTPA and mixed solution of chelates, respectively, the separational widths of the rare earth elements which eluted with the mixed solution chelates of the same volume are more broad than rare earth elements was much good.
4) Most of the rare earth elements were adsorbed in the upper part of the column.
5) When the rare earth elements adsorbed by cation exchange resin were eluted with 0.025M-DTPA(pH=8.2), those were separated very effectively and the separational order was La. Ce. Sm. Pr. Nd. and Y.
6) La_2O_3, Ce_2O_3 and Y_2O_3 were separate very completely, but Sm_2O_3, Pr_2O_3 and Nd_2O_3 were partially separated.
7) La_2O_3, Ce_2O_3, Y_2O_3 and U_3O_8 were determined by X-ray luminesence spectrum without interference weve-length.
8) The monazite sands of esperimental area were included with La_2O_3, Ce_2O_3, Nd_2O_3, Sm_2O_3 and Y_2O_3 etc., and content of Ce_2O_3 in the rare earth elements was maximum value.