Abstract
Papaverine (Pap) ion-selective plastic membrane electrodes based on ion associates of papaverine with phosphotungstic acid (Pap-PTA) and phosphomolybdic acid (Pap-PMA) were prepared and fully characterized in terms of membrane composition, life span, pH, and temperature. The proposed electrodes were applied to potentiometeric determination of papaverine in the parent substance and a related pharmaceutical preparation under batch and flow-injection analysis conditions. In addition, conductometric titrations were used for the assay of papaverine in the parent substance and the related pharmaceutical preparation. The selectivity of electrodes with respect to a large number of foreign inorganic cations, amino acids, and sugars was tested. The solubility product of the ion associate and the rate constant of the precipitation reaction leading to the ion associate formation were determined conductometrically.
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