A new colorimetric procedure for the determination of serum potassium with silvercobaltinitrite reagent

A new procedure for The determination of serum potassium was presenred.Potassium was presioitated by The addition of silver cobaltinitrite solution to serum,The precioitate thus formed was purified by centrifugation and washing,and dissolved in sodium thiosulfate solution,Theresultant solution was treated by choline chloride and potassium ferrocyanide to produce a emerald green color which was suitable for photoelectric colorimetry.This procedure was recommended for The routine lablratory work,because it was simple as well as reliable.