Liquid chromatography of alkali and alkaline-earth metal ions using octadecylsilanized silica columns modified in situ with lipophilic crown ethers
Octadecylsilanized silica (ODS) was coated with highly lipophilic crown ethers to obtain novel crown ether containing stationary phases for ion chromatography. The in situ modified ODS columns proved convenient and efficient for chromatographic separation of alkali and alkaline-earth metal ions. The retention times of alkali metal ions on the crown ether coated ODS are increased in the order Li/sup +/ < Na/sup +/ < Cs/sup +/ < Rb/sup +/ < K/sup +/ for the 18-crown-6 and 15-crown-5 derivatives and in the order Li/sup +/ < Cs/sup +/ < Rb/sup +/ < K/sup +/ < Na/sup +/ for the 12-crown-4 derivatives, being reflected in the cation-complexing properties of the crown ether rings. Simultaneous coating of more than one crown ether on ODS is possible as well, which permits easy control of the chromatographic behavior of the crown ether stationary phases. The stability (durability) of the crown ether modified ODS columns is also described.
- Research Organization:
- Osaka Univ., Japan
- OSTI ID:
- 5241916
- Journal Information:
- Anal. Chem.; (United States), Vol. 58:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CESIUM
LIQUID COLUMN CHROMATOGRAPHY
LITHIUM
POTASSIUM
RUBIDIUM
SODIUM
CATIONS
COMPLEXES
EXPERIMENTAL DATA
ORGANIC COMPOUNDS
POLYETHYLENE GLYCOLS
SILANES
SILICA
ALCOHOLS
ALKALI METALS
CHALCOGENIDES
CHARGED PARTICLES
CHROMATOGRAPHY
DATA
ELEMENTS
GLYCOLS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
IONS
METALS
MINERALS
NUMERICAL DATA
ORGANIC POLYMERS
ORGANIC SILICON COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POLYMERS
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
400105* - Separation Procedures