Abstract
A very-high-efficiency liquid-liquid chromatographic (LLC) system based on 5- and 20-μm diameter porous silica microspheres was used to effect radiochemical separations of metal ions that required very large decontamination factors and/or high speeds. The stationary phase was 25–30% (w/w) of di(2-ethylhexyl) orthophosphoric acid (HDEHP) in dodecane. Nitric acid was used as the mobile phase. The mass transfer coefficient term, C, was determined from height equivalent to a theoretical plate vs. interstitial linear velocity data for the elution of Ca 2+ and compared with values calculated from the interfacial mass transfer coefficients measured in the corresponding liquid-liquid extraction system. The HDEHP high-efficiency LLC system was also investigated for possible usein enriching the naturally occurring isotopes of calcium. Isotopic exchange constants for 40Ca or 42Ca and 48Ca were measured chromatographically as a function of temperature. The enrichment of calcium isotopes was attempted on coupled columns at low flow velocities.
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