Solvent extraction of radium with crown ether carboxylic acids

Journal Article · Sat Oct 15 04:00:00 EDT 1994 · Analytical Chemistry (Washington); (United States)

DOI:https://doi.org/10.1021/ac00092a036· OSTI ID:6768349

Beklemishev, M K; Elshani, S; Wai, C M ^[1]

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1. Univ. of Idaho, Moscow, ID (United States)

The capabilities of a series of 11 crown ether carboxylic acids with different hydrocarbon substituents have been evaluated for solvent extraction of radium in aqueous solutions. The extraction of radium proceeds from alkaline media into chloroform solutions of the crown ethers. The extraction requires no specific counteranions and is reversible with respect to pH. Substitution of tert-butyl groups in the benzene rings of sym-dibenzo-16-crown-5-oxyacetic acid increases the lipophilicity of the macrocyclic compound and enhances the extraction efficiency for radium. Radium forms a RaL[sub 2]-type complex with this tert-butyl-substituted crown ether carboxylic acid with a binding constant of (4.2 [+-] 0.7) x 10[sup 8]. 15 refs., 3 figs.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6768349
• Journal Information: Analytical Chemistry (Washington); (United States), Journal Name: Analytical Chemistry (Washington); (United States) Vol. 66:20; ISSN 0003-2700; ISSN ANCHAM
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400105 -- Separation Procedures
400201* -- Chemical & Physicochemical Properties
400600 -- Radiation Chemistry
ALKALINE EARTH METAL COMPLEXES
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
COMPLEXES
CROWN ETHERS
DISPERSIONS
ELEMENTS
ETHERS
EXTRACTION
HALOGENATED ALIPHATIC HYDROCARBONS
METALS
MIXTURES
ORGANIC ACIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PH VALUE
RADIUM
RADIUM COMPLEXES
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION