CONSTRUCTION AND PERFORMANCE-CHARACTERISTICS OF NEW TETRAMISOLE SELECTIVE PLASTIC MEMBRANE ELECTRODES

New tetramisole (Tm) ion selective PVC membrane electrodes are constru cted based on either the ion-pair complex Tm TPB (Electrode I) where T PB is tetraphenylborate or the ion associate Tm3 PT (Electrode 11) whe re PT is phosphotungstate. The rectilinear concentration ranges of Ele ctrodes I and II are 4 x 10(-5)-10(-2)M (average slope = 55.7 mV/conce ntration decade) and 5 X 10(-5)-10(-2)M TmCl (average slope = 57.0 mV/ concentration decade), at 25-degrees-C, respectively. The life time of the two Electrodes I and II are 14 and 49 days of continuous working, respectively. The change in pH does not affect the electrodes perform ance within the range 3.0-5.5, 3.0-6.0 and 3.0-7.0 for Tm concentratio ns 10(-2), 5 x 10(-3) and 10(-3)M, respectively. The isothermal coeffi cients of Electrodes I and II are found to be 0.000667 and 0.001164 V/ degrees-C, respectively. The electrodes proved to be highly selective for TmCl towards inorganic cations, sugars and amino acids. The standa rd addition method and potentiometric titration are used to determine Tm in pure solutions and in tetramisole 10% oral solution. Regeneratio n process for the exhausted Electrodes I and II is applied successfull y by soaking them in a solution of NaTPB and PTA, respectively.