Extraction of alkali metal cations from aqueous solutions by a crown ether carboxylic acid. [Sym-dibenzo-16-crown-5-oxyacetic acid]
Solvent extraction of alkali metal cations from aqueous solutions by sym-dibenzo-16-crown-5-oxyacetic acid in chloroform is reported. Influence of pH, metal ion identity and concentration in the aqueous phase, and anion identity in the aqueous phase upon the concentrations of metal and complexing agent in the organic phase are assessed for single ion extractions. Extraction efficiency is insensitive to changing the aqueous phase anion from chloride to sulfate which demonstrates that the anion is not transferred to the organic phase during extraction. Extraction efficiency is very sensitive to the pH of the aqueous phase. For competitive ion extractions, the selectivity is K > Na > Rb greater than or equal to Cs > Li for pH 6 to 7 and Na > K > Rb approx. = Cs > Li for pH 8 to 12. The crown ether carboxylic acid exhibits extraction efficiencies and selectivities which surpass those of sym-dibenzo-16-crown-5 methyl ether or phenoxyacetic acid.
- Research Organization:
- Texas Tech Univ., Lubbock
- OSTI ID:
- 6088076
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 53:12; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Extraction of alkaline earth cations from aqueous solutions by crown ether carboxylic acids
Complexation of lanthanides with crown ether carboxylic acids and its applications in analytical chemistry
Related Subjects
400105* -- Separation Procedures
ALCOHOLS
ALKALI METALS
AQUEOUS SOLUTIONS
AROMATICS
CARBOXYLIC ACIDS
CESIUM
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
COMPARATIVE EVALUATIONS
DATA
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
GLYCOLS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
LITHIUM
METALS
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PH VALUE
POLYETHYLENE GLYCOLS
POLYMERS
POTASSIUM
RUBIDIUM
SEPARATION PROCESSES
SODIUM
SOLUTIONS
SOLVENT EXTRACTION
SOLVENT PROPERTIES