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Title: Calcium hydroxide isotope effect in calcium isotope enrichment by ion exchange

The enrichment of calcium isotopes has been observed in ion-exchange chromatography with an aqueous phase of calcium hydroxide and a solid phase of sulfonic acid resin. The band front was exceedingly sharp as a result of the acid-base reaction occuring at the front of the band. Single-stage separation coefficients were found to be epsilon(/sup 44/Ca//sup 40/Ca) = 11 x 10 /sup -4/ and epsilon(/sup 48/Ca//sup 40/Ca) = 18 x 10/sup -4/. The maximum column separation factors achieved were 1.05 for calcium-44 and 1.09 for calcium-48 with the heavy isotopes enriching in the fluid phase. The calcium isotope effect between fully hydrated aqueous calcium ions and undissociated aqueous calcium hydroxide was estimated. For the calcium-44/40 isotope pair the separation coefficient was 13 x 10/sup -4/. 20 references, 2 figures.
Authors:
;
Publication Date:
OSTI Identifier:
6418050
DOE Contract Number:
AC04-76DP00053
Resource Type:
Journal Article
Resource Relation:
Journal Name: Sep. Sci. Technol.; (United States); Journal Volume: 19:2-3
Research Org:
Monsanto Research Corp., Miamisburg, OH
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CALCIUM 44; ISOTOPE EFFECTS; ISOTOPE SEPARATION; CALCIUM 48; AQUEOUS SOLUTIONS; CALCIUM HYDROXIDES; EXPERIMENTAL DATA; ION EXCHANGE; ISOTOPE RATIO; ALKALINE EARTH ISOTOPES; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CALCIUM ISOTOPES; DATA; DISPERSIONS; EVEN-EVEN NUCLEI; HYDROGEN COMPOUNDS; HYDROXIDES; INFORMATION; INTERMEDIATE MASS NUCLEI; ISOTOPES; MIXTURES; NUCLEI; NUMERICAL DATA; OXYGEN COMPOUNDS; SEPARATION PROCESSES; SOLUTIONS; STABLE ISOTOPES 400202* -- Isotope Effects, Isotope Exchange, & Isotope Separation; 400203 -- Isotope Exchange & Isotope Separation-- (-1987)