Solvent extraction studies of lanthanum(III) and neodymium(III) with ionizable macrocyclic ligands and thenoyltrifluoroacetone

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00124a033· OSTI ID:5280069

Manchanda, V K; Chang, C A

Extraction behavior of La(III) and Nd(III) has been investigated by using thenoyltrifluoroacetone (TTA) as extractant in the presence of 1,7-diaza-4,10,13-trioxacyclopentadecane-N,N'-diacetic acid (DAPDA) and 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-N,N'-diacetic acid (DACDA) as macrocyclic ionophores. DAPDA and DACDA were chosen in this work in view of their unique complexation toward lanthanides. Ultraviolet spectra were adduced for the formation of ternary complex La(DAPDA)TTA in the aqueous phase. It was observed that Ln(TTA)/sub 3/ is the dominating species extracted at pH less than or equal to 5.0 and Ln(DAPDA/DACDA)TTA is the dominating species at pH approx. 7.5. Extraction of ternary complex of La(III) was found to be greater in the case of DAPDA and smaller in the case of DACDA as compared to the extraction of the corresponding ternary complex of Nd(III). By use of the stoichiometric concentration of DAPDA/DACDA and following distribution as a function of pH, lanthanide extraction maxima were observed at pH 7.5-8.0. Finally, the analytical significance of the work is discussed.

• Research Organization: Univ. of Texas, El Paso
• OSTI ID: 5280069
• Journal Information: Anal. Chem.; (United States), Vol. 58:11
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACETONE
SOLVENT PROPERTIES
FLUORINE COMPOUNDS
LANTHANUM
SOLVENT EXTRACTION
NEODYMIUM
ORGANIC SOLVENTS
COMPLEXES
EXPERIMENTAL DATA
LIGANDS
PH VALUE
SOLUTIONS
ULTRAVIOLET SPECTRA
DATA
DISPERSIONS
ELEMENTS
EXTRACTION
HALOGEN COMPOUNDS
INFORMATION
KETONES
METALS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
RARE EARTHS
SEPARATION PROCESSES
SOLVENTS
SPECTRA
400105* - Separation Procedures