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Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides

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Rare earth element separations by high-speed counter-current chromatography.

Mateusz Dembowski¹, John E Rowley¹, Kevin Boland¹

¹Los Alamos National Laboratory, Los Alamos, NM 87545, Mexico.

Journal of Chromatography. A

|September 30, 2022

Summary

High-Speed Counter-Current Chromatography (HSCCC) effectively separated non-radioactive rare earth elements (REEs) like Neodymium and Samarium. This study demonstrates HSCCC

Keywords:

HDEHP High speed counter-current chromatography Rare earth elements

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Area of Science:

Analytical Chemistry
Separation Science

Background:

High-Speed Counter-Current Chromatography (HSCCC) has seen limited application in rare earth element (REE) separation recently.
Previous research explored HSCCC for REEs, but practical applications remain underdeveloped.

Purpose of the Study:

To evaluate the suitability of HSCCC for separating a subset of non-radioactive rare earth elements (Nd, Sm, Eu, Tb, Y).
To optimize HSCCC parameters for efficient REE separation and assess reproducibility.

Main Methods:

Utilized di-(2-ethylhexyl)phosphoric acid (HDEHP) in n-heptane as the stationary phase and hydrochloric acid as the mobile phase.
Investigated the impact of flow rate on stationary phase retention and resolution for the Nd/Sm/Eu subgroup.
Optimized step-gradient elution profiles for the separation of Tb and Y.

Main Results:

Achieved baseline resolution or higher for five non-radioactive REEs (Nd, Sm, Eu, Tb, Y) within a seven-hour period.
Demonstrated reproducibility of elution profiles across multiple runs and independently operated columns.
Successfully separated REEs at 10^-4 mol levels.

Conclusions:

HSCCC is a viable technique for the separation of specific non-radioactive rare earth elements.
The reproducibility of HSCCC elution profiles suggests potential applications in radioelement separation chemistry.
Further development could enhance chemical and radiochemical purity in complex separation scenarios.