Potentiometric titration of thiols, cationic surfactants and halides using a solid-state silver-silver sulphide electrode.
A rugged, low resistance silver-silver sulphide solid-state electrode for determining pharmaceuticals as authentic samples or in dosage forms by potentiometric titration is described. Sodium tetraphenylborate, mercury(II) acetate and silver nitrate (0.01) M were employed as titrants in the analysis of cationic surfactants (cetylpyridinium chloride, benzethonium chloride, benzalkonium chloride and chlorhexidine salts), antithyroid drugs (methimazole and propylthiouracil) or sodium halides respectively.
Pinzauti
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Istituto di Chimica Farmaceutica, Universitá di Firenze, Via G. Capponi 9, I-50121 Firenze, Italy.
Papeschi
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La Porta
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