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