Abstract
The separation of sodium and potassium by means of ammonium molybdophosphate (AMP) cation-exchange columns is described. Up to 0.1 meq of potassium can be separated quantitatively from amounts up to 50 meq of sodium on a small (4 g AMP) column. With as much as 0.25 meq of potassium, quantitative separation can be effected by the successive use of two small columns. By a combination of this separation with conventional ion-exchange methods, sodium and potassium can be determined individually in the presence of various other cations.
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