Mechanism and applications of ion-pair extraction by polyurethane foam
Polyurethane foam was employed for the extraction and separation of a number of metal ions. Analyses were performed by radiometric methods, flame photometry, atomic absorption and UV-visible spectrophometry. Both polyester- and polyether-based polyurethane foams were tested for the extraction of dicyclohexyl 18-crown-6 complex of monovalent cations (Na/sup +/, K/sup +/, Rb/sup +/, Cs/sup +/, Ag/sup +/, Tl/sup +/) from the aqueous solutions of bulky anions (picrate and 8-anilino-1-naphthalene sulfonate (ANS)). Both types of polymer exhibit performance similar to that of organic solvents, with the polyester-based foam being slightly superior. The order of extraction for alkali metal ions is K/sup +/ > Rb/sup +/ > Cs/sup +/ > Na/sup +/ and is mainly dependent on the stabilities of the alkali metal-crown ether complexes. At least two mechanisms, ion-pair extraction and cation chelate mechanism, are proposed for the absorption of metal picrates by the polyurethane foams. Polyurethane foam was applied to the sorption and determination of phosphate as 12-phosphomolybdate. In situ x-ray fluorescence analysis of molybdenum proved to be a convenient method for the indirect determination of phosphate.
- OSTI ID:
- 5617702
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM
ABSORPTION SPECTROSCOPY
FLAME PHOTOMETRY
RADIOMETRIC ANALYSIS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
CALCIUM
CESIUM
EXTRACTION
LEAD
PHOSPHORUS
X-RAY FLUORESCENCE ANALYSIS
POTASSIUM
RUBIDIUM
SILVER
SODIUM
STRONTIUM
THALLIUM
ADSORPTION
CATIONS
FOAMS
POLYETHYLENE GLYCOLS
POLYURETHANES
ALCOHOLS
ALKALI METALS
ALKALINE EARTH METALS
CHARGED PARTICLES
CHEMICAL ANALYSIS
COLLOIDS
DISPERSIONS
ELEMENTS
GLYCOLS
HYDROXY COMPOUNDS
IONS
MATERIALS
METALS
NONDESTRUCTIVE ANALYSIS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOTOMETRY
PLASTICS
POLYAMIDES
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SORPTION
SPECTRA
SPECTROSCOPY
SYNTHETIC MATERIALS
TRANSITION ELEMENTS
X-RAY EMISSION ANALYSIS
400104* - Spectral Procedures- (-1987)
400103 - Radiometric & Radiochemical Procedures- (-1987)
400105 - Separation Procedures