A study of possible interferences in colorimetric determination of potassium in pharmaceutical formulations.
A study of interferences in the colorimetric determination of potassium, extracted as ion-pair [K-18-crown-6]+ picrate- in the toluene-methylene chloride (80:20) solvent mixture, was carried out. The species examined were those likely to be found, together with the K ion, in typical pharmaceutical formulations, namely, organic bases and inorganic cations.
Dipartimento di Scienze Farmaceutiche, Università di Bologna.
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D003124:Colorimetry; D011188:Potassium / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet
D011188:Potassium