Extraction of alkaline earth cations from aqueous solutions by crown ether carboxylic acids
Solvent extraction of Mg, Ca, Sr, and Ba cations from aqueous solutions by sym-dibenzo-16-crown-5-oxyacetic acid (1), sym-dibenzo-13-crown-4-oxyacetic acid (2), and sym-dibenzo-19-crown-6-oxyacetic acid (3) in chloroform has been investigated. Influences of pH and metal ion concentration in the aqueous phase upon the concentrations of metal(s) and complexing agent in the organic phase are assessed for single ion (with 1) and competitive (with 1, 2, or 3) extractions. Marked differences in the efficiency and selectivity order for single ion and competitive extractions using 1 are noted. Although chloroform phase extraction complexes of MA/sub 2/ are indicated for each crown ether carboxylic acid, 1 surpasses 2 and 3 in extraction efficiency and selectivity. The crown ether carboxylic acids 1, 2, and 3 are superior extraction agents to closely related neutral crown ethers and to phenoxyacetic acid.
- Research Organization:
- Texas Tech Univ., Lubbock
- OSTI ID:
- 5690401
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 53:14; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105* -- Separation Procedures
ALCOHOLS
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
BARIUM
CALCIUM
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
DATA
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
GLYCOLS
HYDROXY COMPOUNDS
INFORMATION
MAGNESIUM
METALS
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PH VALUE
POLYETHYLENE GLYCOLS
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENT PROPERTIES
STRONTIUM