[Determination of sodium and potassium in solutions less than 1 nanoliter, using helium glow photometer].
D006371:Helium; D008832:Microchemistry; D010783:Photometry / Q000295:instrumentation / Q000379:methods*; D011188:Potassium / Q000032:analysis*; D012964:Sodium / Q000032:analysis*
D006371:Helium; D012964:Sodium; D011188:Potassium