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A study of possible interferences in colorimetric determination of potassium in pharmaceutical formulations. 1990

M A Raggi, and L Nobile, and M Ramini, and I Perboni
Dipartimento di Scienze Farmaceutiche, Università di Bologna.

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.

UI MeSH Term Description Entries
D011188 Potassium An element in the alkali group of metals with an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and other cells. Potassium ion is a strong electrolyte that plays a significant role in the regulation of fluid volume and maintenance of the WATER-ELECTROLYTE BALANCE.
D003124 Colorimetry Any technique by which an unknown color is evaluated in terms of standard colors. The technique may be visual, photoelectric, or indirect by means of spectrophotometry. It is used in chemistry and physics. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
D013056 Spectrophotometry, Ultraviolet Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Ultraviolet Spectrophotometry

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