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  • Title: New polyvinyl chloride membrane electrode without inner reference solution for the determination of methadone.
    Author: Khalil S, Kelzieh A.
    Journal: J Pharm Biomed Anal; 2003 Mar 10; 31(3):601-6. PubMed ID: 12615250.
    Abstract:
    A PVC membrane electrode, without inner reference solution, based on an ion association extraction system responding to methadone (MD) is described. It incorporates a methadone-tetrakis(4-chlorophenyl)borate ion-pair complex in 2-nitrophenyloctyl ether. The prepared electrode exhibits a near Nernstian response (59.5 mV per decade) over the concentration range 2.5 x 10(-5)-10(-1) M MD in solutions of pH 2.0-9.0. The reproducibility of the electrode potentials was +/-1 mV by day during at least 6 months. Response time was about 5 s for MD concentrations between 10(-5) and 10(-1) M. Determinations of MD in pharmaceutical preparations (tablets and syrups) by direct potentiometry gave an average recovery of 99.3% (w/w) and a mean S.D. of 1.5% (w/w).
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