Terada, Y Continuous-flow quantitation of Na+ and K+ in nanoliter samples using chromogenic macrocyclic ionophores. [electronic resource] - The American journal of physiology Nov 1989 - F893-8 p. digital Publication Type: Journal Article ISSN: 0002-9513 Standard No.: 10.1152/ajprenal.1989.257.5.F893 doi Subjects--Topical Terms: Colorimetry--methodsIonophoresPotassium--analysisSodium--analysis