Studies on the ammonium-lactate elution of trace lanthanides

E. Brücher, P. Szarvas

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

According to our ion-exchange equilibrium and diffusion-rate investigations in the course of the separation of trace lanthanides on a cation-exchange column by NH4-lactate elution, the charge of the lanthanide ions diffusing in the resin phase, decreases abruptly from 3 to a value round 2 above a certain NH4-lactate concentration, owing to the formation of lactate complexes. This decrease in the charge takes place, at lower and lower NH4-lactate concentrations as the atomic number of the rare earth element increases. The most important ion-exchange reaction taking place in the course of the separation is as follows: LnL2++2NH4+⇌LnL2++2NH42+. For a flow rate of 1 cm/min of the eluant, used for the separation, the rate of the ion-exchange process is determined by diffusion through the Nernst boundary layer, which practically does not influence the separation factors. The values of these factors are predominantly determined by the stability constants of the LnL2+ and LnL3 complexes as well as by the affinity of the LnL2+ ions for the resin phase.

Original languageEnglish
Pages (from-to)2361-2369
Number of pages9
JournalJournal of Inorganic and Nuclear Chemistry
Volume28
Issue number10
Publication statusPublished - Oct 1966

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Lanthanoid Series Elements
lactates
elution
Rare earth elements
Lactic Acid
Ion exchange
ions
Resins
resins
Ions
Cations
Boundary layers
Positive ions
Flow rate
affinity
boundary layers
rare earth elements
flow velocity
cations

Cite this

Studies on the ammonium-lactate elution of trace lanthanides. / Brücher, E.; Szarvas, P.

In: Journal of Inorganic and Nuclear Chemistry, Vol. 28, No. 10, 10.1966, p. 2361-2369.

Research output: Contribution to journalArticle

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