Abstract
A convenient flame photometric procedure for determining potassium in sea water and biological materials is described. Factors affecting the intensity of the spectral line emitted by potassium ions were studied. The major constituents of sea water showed no spectral interference on the potassium analysis. Chloride ions and sulphuric acid gave a negative radiation interference while sodium ions showed a positive effect. The “internal standard addition” procedure was used for eliminating the effect of these interfering constituents. An average potassium/chlorinity ratio of 0.538 was obtained for the Pacific coastal water with potassium concentration being expressed in mg-atom. The applicability of this procedure for the détermination of potassium in biological materials was also demonstrated.
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