Helium-Glow Photometer for Picomole Analysis of Alkali Metals

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Science  23 Jul 1965:
Vol. 149, Issue 3682, pp. 448-450
DOI: 10.1126/science.149.3682.448


The low-power electricglow discharge in helium can excite efftctively the characteristic emission lines of sodium and potassium. The helium-glow photometer used to generate the glow and measure the light is a relatively simple apparatus; it can be used to analyze samples containing 10-14 mole or more of sodium and potassium. Overall precision of the apparatus and method is 5 percent or better.