Calcium isotope effect in calcium ion exchange with a fluid phase containing a macrocyclic compound
The separation coefficient for calcium isotope exchange with a macrocyclic polyether was measured by ion exchange chromatography. The isotopic enrichment proceeds according to the chemical exchange reaction: UUCaLS /sub Fluid +/UCaS /sub Resin/in equilibriumUCaLS /sub Fluid +/UUCaS where L represents the macrocyclic polyether 18-crown-6. The observed separation coefficient for the calcium 40/44 isotope pair, epsilon(40/44), was 4.9 x 10 U (+/-1.3 x 10 U, 95% C.L.) with calcium-40 enriched in the fluid phase. A sulfonic acid resin was used with a fluid phase consisting of a 70/30 volume percent mixture of ethanol and water. The isotope effect was smaller than metal-crown isotope effects reported in the literature, and possible reasons for this are discussed.
- Research Organization:
- MRC-Mound, Miamisburg, OH
- DOE Contract Number:
- AC04-76DP00053
- OSTI ID:
- 6293016
- Report Number(s):
- CONF-851011-; TRN: 87-028444
- Journal Information:
- Sep. Sci. Technol.; (United States), Vol. 22:2/3; Conference: 4. symposium on separation science and technology for energy applications, Knoxville, TN, USA, 20 Oct 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM
ION EXCHANGE CHROMATOGRAPHY
CALCIUM 44
ISOTOPE SEPARATION
ISOTOPIC EXCHANGE
POLYETHYLENE GLYCOLS
ETHANOL
EXPERIMENTAL DATA
ISOTOPE EFFECTS
RESINS
SULFONIC ACIDS
WATER
ALCOHOLS
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METALS
CALCIUM ISOTOPES
CHROMATOGRAPHY
DATA
ELEMENTS
EVEN-EVEN NUCLEI
GLYCOLS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
METALS
NUCLEI
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
SEPARATION PROCESSES
STABLE ISOTOPES
400202* - Isotope Effects
Isotope Exchange
& Isotope Separation