Crystalline antimonic acid (C-SbA) as a cation exchanger shows a low distribution coefficient value (0.33) for lithium ions and a relatively high value (>4.8 × 102) for sodium and potassium ions in 0.1M nitric acid solution, and has a reasonable rate of adsorption and desorption for these metal ions. A new method is presented for removing microamounts of sodium and potassium from a large quantity of lithium chloride by using a frontal chromatographic technique. A favorable separation is obtained by passage of the lithium chloride solution containing microamounts of sodium and potassium, dissolved in 0.1 M hydrochloric acid solution, on a C-SbA column of 6.0 × 0.8 cm i.d. The retention is quantitative with a maximum capacity of 1.81 meq/g for sodium ions and 1.15 meq/g for potassium ions in a 0.1 M nitric acid solution. The adsorbed sodium and potassium ions are readily eluted with a 5 M ammonium nitrate solution containing 1 M nitric acid as the eluant, and then the C-SbA column is easily regenerated by using a 1 M nitric acid solution. The method is applied for the removal of microamounts of sodium and potassium from commercial reagents of lithium chloride.
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Mitsuo Abe (1978) studied this question.
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