The flame photometric determination of traces of sodium and potassium in the presence of other metals, and methods for over-coming some interferences

Abstract A study has been made of the interferences caused by the major metals in the flame photometric determination of sodium and potassium in inorganic salts using an EEL flame photometer. Many metals do not interfere, enabling a straightforward determination to be made. Methods of overcoming the interference of certain other metals include suppression of their flame emissions with aluminium nitrate or their removal by ion-exchange methods before the determination of sodium and potassium.