Formation Constants of the Complex Species Formed by Interaction of Rare-Earth Nitrilotriacetate Complexes with an Equivalent Amount of Base Page: 2
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complex species of the type RChOH*. Thai is.
RCh ♦ OH’= RChOH" j K
RChOH*
RChOH *RCh*OH-
where R** and Ch * denote the rare-earth cation and the nilrilotri-
acetate (NTA) anion, respectively. Available data are in good agree-
ment with this association mechanism.
At a fixed ionic strength an apparent formation constant, based
on concentrations, can be defined as follows:
(RChOH “) VRCh * VOH*
KRChOH x(RCh) |OH” J * YRChOH" KRChOH *
Such constants are valuable in predicting what separations may be achieved
when Unary rare-earth mixtures are eluted down cation-exchange systems
with NTA under alkaline conditions. Consequently, it was decided to
study these apparent formation constants as a function of the atomic num-
ber of the central rare-earth ion.
Experimental
Preparation of the Reagents. - All the rare-earth nitrilotriacetates,
except the yttrium compound, were supplied by Dr. S. C. Levy, formerly
of this laboratory. 3 The complexes were recrystallised by the following
method. The complex compound was combined with distilled water and
heated as a minimum amount of alkali was added, dr >p by drop, until
dissolution was complete. The solution was then filtered, acidified to a
pH betvaen 5 and 6 by addition of HC1, and heated. The neutral 1:1
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Guptak, Asim K. & Powell, Jack E. Formation Constants of the Complex Species Formed by Interaction of Rare-Earth Nitrilotriacetate Complexes with an Equivalent Amount of Base, report, April 13, 1962; Ames, Iowa. (https://digital.library.unt.edu/ark:/67531/metadc1201507/m1/2/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.