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

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
Data Type:
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)