Anal. Lett., v. 29(6), p. 843-858 (1996)

Surfactant ion selective membrane electrodes

N.V. Shvedene, T. V. Shishkanova, I.V. Pletnev, N.N. Belchenko, V.V. Kovalev, A.K. Rozov, E.A. Shokova

Moscow State University, Moscow, 119899 Russia

Abstract - Calix[8]arene ethers, carboxylic esters having various p-substituents and acid are synthesized and studied. In a bulk membrane transport of dodecylpyridinium the better carrier is the simplest host, calix[8]arene octamethyl ether. Inversely, it is the worst carrier for dodecyltrimethylammonium; the better here is carboxy ester with adamantyl p-substituents. Various calixarenes are successfully used in plasticized membrane ion-selective electrodes (ISE) for both above ammonium and pyridinium surfactants. Operational characteristics, potentiometric selectivity and optimal membrane compositions are reported. Typical limit of detection is at the level of n x 10 -6 - 1 x 10 -5 M, response time 5 - 10 s, and lifetime is at least 6 months. ISE's selectivity is significantly better than that of ion-association and crown-ether based electrodes.