Study on the Precision Analysis of Lanthanides by Atomic Emission Spectroscopy (Ⅰ). Separation of Rare Earth Elements Using Ln-EDTA Eluent 


Vol. 36,  No. 5, pp. 692-696, Oct.  1992


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  Abstract

NH4+형 양이온 교환수지와 희토류-EDTA 용리액을 사용하여 희토류 원소 혼합물에서 원하는 한 원소를 분리 회수하는 연구를 하였다. NH4+형 양이온 교환수지에 희토류 혼합물을 흡착시키고, La-EDTA 용액으로 용리하면 수지에 흡착된 희토류 원소중 La3+ 이온 외의 희토류 원소는 용리된다. 수지에 남아있는 La3+은 EDTA 용리액으로 용리하여 분리한다. Ce4+만 선택적으로 분리하고자 할때는 La-EDTA 대신 Ce-EDTA로 용리하고 수지에 남은 Ce4+을 EDTA로 용리하면 된다. 이때 분리 구조는 다음과 같다. 흡착과정 : 3RNH4 ＋ Ln3+ = R3Ln ＋ 3NH4+, La-EDTA 용리 : R3Ln ＋ La-Y- = R3La ＋ Ln-Y-, EDTA 용리 : R3La ＋ HY3- = La-Y ＋ RH ＋ 2R-. NH4+ form cation exchange resin was used to separate one rare earth element from the rare earth mixture solution using Ln-EDTA eluent. Rare earth mixture solution was passed through the resin bed and eluted with 0.1M La-EDTA solution as an eluent. In here all the rare earth element except lanthanum ion are eluted and lanthanum ion absorbed in resin bed is eluted using 0.1M EDTA solution. If Ce-EDTA solution instead of La-EDTA solution was used as an eluent, all the rare earth element except cerium ion are eluted and cerium ion is eluted with 0.1M EDTA solution. This method can be applied to separate the individual rare earth element from the mixture. The separation mechanism is as follows: Absorption : 3RNH4 ＋ Ln3+ = R3Ln ＋ 3NH4+, La-EDTA elution : R3Ln ＋ La-Y- = R3La ＋ Ln-Y-, EDTA elution : R3La ＋ HY3- = La-Y ＋ RH ＋ 2R-.

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  Cite this article

[IEEE Style]

K. Cha, J. Oh, Y. Ha, H. Kim, "Study on the Precision Analysis of Lanthanides by Atomic Emission Spectroscopy (Ⅰ). Separation of Rare Earth Elements Using Ln-EDTA Eluent," Journal of the Korean Chemical Society, vol. 36, no. 5, pp. 692-696, 1992. DOI: .

[ACM Style]

Ki-Won Cha, Jin-Hee Oh, Young-Gu Ha, and Ha-Suck Kim. 1992. Study on the Precision Analysis of Lanthanides by Atomic Emission Spectroscopy (Ⅰ). Separation of Rare Earth Elements Using Ln-EDTA Eluent. Journal of the Korean Chemical Society, 36, 5, (1992), 692-696. DOI: .

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