Calcium isotope fractionation in ion-exchange chromatography

Journal Article · Sat Jul 01 00:00:00 EDT 1978 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac50030a036· OSTI ID:6549169

Russell, W A ^[1]; Papanastassiou, D A

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1. California Inst. of Tech., Pasadena

Significant fractionation of the isotopes of calcium has been observed during elution through short ion-exchange columns packed with Dowex 50W-X8 resin. A double isotopic tracer was used to provide correction for instrumental fractionation effects. The absolute /sup 40/Ca//sup 44/Ca ratio is determined by this method to 0.05% and provides a measure of the fractionation of all Ca isotopes. It is found that the lighter isotopes are preferentially retained by the resin, with variations in /sup 40/Ca//sup 44/Ca between the first and last fractions of up to 1.1%. An estimate of the separation factor between batch solute and resin gives epsilon = 2.1 x 10/sup -4/. Details of the chemical or physical mechanisms causing isotope fractionation of Li, Na, Ca, and other elements during ion-exchange chromatography are not yet clear.

• OSTI ID: 6549169
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 50:8; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400203* -- Isotope Exchange & Isotope Separation-- (-1987)
ALKALINE EARTH ISOTOPES
CALCIUM 40
CALCIUM 44
CALCIUM ISOTOPES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
EVEN-EVEN NUCLEI
FRACTIONATION
INTERMEDIATE MASS NUCLEI
ION EXCHANGE CHROMATOGRAPHY
ION EXCHANGE MATERIALS
ISOTOPE APPLICATIONS
ISOTOPE SEPARATION
ISOTOPES
LIGHT NUCLEI
NUCLEI
ORGANIC ION EXCHANGERS
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
STABLE ISOTOPES
TRACER TECHNIQUES