Membrane electrodes sensitive to doubly charged surfactants. Application to a cationic gemini surfactant. - Archive ouverte HAL
Article Dans Une Revue Talanta Année : 2003

Membrane electrodes sensitive to doubly charged surfactants. Application to a cationic gemini surfactant.

Résumé

The response of a membrane electrode is not always identical to that of a redox electrode. Indeed, in the case of membrane electrode the response is not due to a redox equil. but to a cross-membrane potential. So, the membrane electrode's response depends mainly on the carrier system and the nature of the membrane. The properties of the membrane can favor several reactions giving rise to different ionic species diffusing in the membrane. The expression of the cross-membrane potential thus depends on the no. and quantities of these ionic species. To illustrate this, we established the equations for the case of a two-charge cation detected by a univalent charged carrier. We show that the Nernstian response is not applicable to membrane electrodes. This approach allowed us to interpret results obtained with a cationic gemini surfactant-selective electrode prepd. in the lab. To prove the well working of this electrode, we detd. the crit. micelle concn. in water and several NaBr solns. (0.004, 0.006, 0.01 and 0.02 M) from which the counterion binding has been detd.

Dates et versions

hal-00169940 , version 1 (05-09-2007)

Identifiants

Citer

Juliette Sirieix-Plénet, Mireille Turmine, Pierre Letellier. Membrane electrodes sensitive to doubly charged surfactants. Application to a cationic gemini surfactant.. Talanta, 2003, 60 (5), pp.1071. ⟨10.1016/S0039-9140(03)00192-9⟩. ⟨hal-00169940⟩
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