The flame photometer for the measurement of sodium and potassium in biological materials.

The flame photometer was devised by Barnes, Richardson, Berry, and Hood (1) to measure low concentrations of sodium and potassium in solution. The present paper describes an investigation of its application to the analysis of biological materials. Measurements of sodium and potassium in such materials by means of the flame photometer were com-pared with measurements made by chemical procedures of tested accuracy which been previously