Formation Constants of the Complex Species Formed by Interaction of Rare-Earth Nitrilotriacetate Complexes with an Equivalent Amount of Base Page: 3
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rare-earth NTA complex immediately reprecipitated and vai filtered
off and dried in the air. After aeveral days weighed specimens were
assayed for rare-earth content by ashing to *t 900*C and weighing.
The yttrium complex species was prepared by the direct reaction
of yttrium chloride with an equivalent amount of trisodium nitrtlotri-
acetate. The precipitate of yttrium nitrilotriacetate was then purified
by several recrystallisations of the type described above and assayed
for rare-earth content.
A 0. 002M stock solution of each rare-earth chelate (except La,
Ce, 9m, and Eu chelates) was prepared by dissolving the required amount
of solid chelate in boiling conductivity water. In the cases of the La, Ce,
Sm, and Eu chelates, 0. 0002M solutions were prepared, due to the low
solubility and slow rate of dissolution of these compounds. Each solution
was standardised by determining the equivalent rare-earth oxide content
by the usual gravimetric procedure, i.e., precipitation as the oxalate
followed by thermal decomposition to the oxide at 900*C.
A 0. 01M solution of carbonate-free KOH was prepared by the
method of Powell and Hiller* and was standardised against HCd (HEDTA)
by the method of Powell, Frits, and Jaxm s.*
A ljM solution of KNO^ was prepared by dissolving a mole of KNO^
in conductivity water in a 1-liter volumetric flask.
Experimental Procedure. -Fifty ml of RCh stock solution and ten
ml of 1M KNO} solution were introduced into each of ten calibrated 150-ml volu-
metric flasks. Varying amounts (one to ten ml generally and one tenth
to one ml in the cases of La, Ce, 5m, and Eu) of 0. 01M KOH were added
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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/m1/3/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.