Cation exchange properties of crown ether-phosphotungstic acid precipitates |
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Authors: | K. K. Luk M. L. Miles L. H. Bowen |
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Affiliation: | (1) Department of Chemistry, North Carolina State University, 27695 Raleigh, North Carolina, (USA) |
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Abstract: | Precipitate formation between phosphotungstic acid and crown ethers is a general phenomenon, producing solids with selective ion exchange behavior for the alkali metal ions. Distribution coefficients for Li+, Na+, K+, and Cs+ were measured for a series of these precipitates with different crown ethers. The sorption data are more complicated than for the corresponding phosphomolybdates and indicate a variability in the number of exchangeable sites with H+ and M+ concentration. The crown ether used markedly affects the cation selectivity of the phosphotungstate precipitates. |
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