Abstract
Isopiestic measurements in dry methyl isobutyl ketone (Hexone), with tri 2-ethyl hexyl phosphoric acid as monomeric standard, show both mono 2-ethyl hexyl phosphoric acid, ( C 2 H 5· C 8 H 12 O) PO( OH) 2, H 2 MEHP, and 2-ethyl hexyl phosphonic acid, ( C 2 H 5· C 6 H 12 O) PO( OH) 2, H 2[ EHP] to be essentially dimeric, the respective number of formula weights per aggregate being measured as 2·4 and 2·3. Assuming the extractants to be dimeric under extraction conditions (wet Hexone) the extraction of Am(III), Eu(III) and Tm(III), as representatives of M 3+, and of Ca(II) and U(VI) i.e. UO 2 2+, as of M 2+, in the H 2Y (Hexone) vs. HCl system may be presented as: H 2 Y is H 2 MEHP: M δ 3+ + 2·5( H 2 Y) 2 o ⇌ M( HY)( H 2 Y 2) 2 o + 3 H δ+ H 2 Y is H 2[ EHP]: M δ 3+ + 3( H 2 Y) 2 o ⇌ M( H 2 Y 2) 2 o + 3 H δ+ H 2 Y is H 2 MEHP or H 2[ EHP]: M δ 3+ + 2( H 2 Y) 2 o ⇌ M( H 2 Y 2) 2 o + 2 H δ+ In H 2MEHP (diluent) vs. HCl systems, comparison of extractant dependency of the K for Eu(III) is made for toluene (non hydrogen bonding), Hexone (hydrogen bond acceptor) and n-decanol (hydrogen bond donor and acceptor) as diluent. The variation of log K with Z for lanthanides(III) in 0·30 F extractant (Hexone) vs. 0·0625 F HCl shows H 2[EHP] to be the more promising extracting for mutual separation of lanthanides (III).
Published Version
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