title: Determination of sodium and potassium concentrations in nanolitre samples. Evaluation of a commercially available helium glow photometer.
mesh_terms: D005069:Evaluation Studies as Topic; D008433:Mathematics; D008832:Microchemistry; D010783:Photometry / Q000295:instrumentation*; D011188:Potassium / Q000032:analysis*; D012964:Sodium / Q000032:analysis*
chemical_list: D012964:Sodium; D011188:Potassium