Separation of americium (III) and strontium (II) using TEHDGA and 18-crown-6
This work describes extraction of Am(III) and Sr(II) together with tetra(2-ethylhexyl) diglycolamide (TEHDGA) and selective back-extraction of strontium with a strontium complexant, 18-crown-6, leading to their separation from each other. 0.3 M TEHDGA+5% isodecyl alcohol/ -dodecane was used to extra...
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Published in | Radiochimica acta Vol. 105; no. 4; pp. 265 - 273 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
De Gruyter
01.04.2017
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Subjects | |
Online Access | Get full text |
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Summary: | This work describes extraction of Am(III) and Sr(II) together with tetra(2-ethylhexyl) diglycolamide (TEHDGA) and selective back-extraction of strontium with a strontium complexant, 18-crown-6, leading to their separation from each other. 0.3 M TEHDGA+5% isodecyl alcohol/
-dodecane was used to extract Am(III) and Sr(II) from 4 M nitric acid into organic phase with very high
(
=1000,
=22) and 0.1 M 18-crown-6 dissolved in 4 M nitric acid is used for selective stripping of Sr(II) from loaded extract phase. Am(III) left in the extract phase was then stripped with 0.01 M nitric acid. Stripping of Sr(II) was found to increase with increase in 18-crown-6 concentration, at 0.1 M 18-crown-6 dissolved in 4 M nitric acid, 83% of the loaded strontium (
=0.20) was back-extracted in a single contact while loss of Am(III) was 0.8% (
=122.45). Stoichiometry limit of 1:1 was observed between strontium and 18-crown-6. Strontium was precipitated and separated from the complexant by Na
SO
or Na
CO
. This process was tested with simulated solution of high level waste and found suitable for quantitative recovery of strontium with high purity. |
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ISSN: | 0033-8230 2193-3405 |
DOI: | 10.1515/ract-2016-2646 |