title: Constant chemical potential titration. Application to determination of nonionic surfactant concentrations.
abstract: Titration is most often associated with the idea of a stoichiometric reaction. Generally, it is not considered possible to titrate a compound against a reagent unless the titration reaction is near total and if the result is not a product of well-defined stoichiometry. In this work, we illustrate that accurate titration is possible with compounds and reagents that interact to form an association of undefined stoichiometry. Our model is the potentiometric titration of nonionic surfactant with cationic surfactant using a cationic surfactant-selective electrode. The result of this reaction is mixed micelles, the composition of which depends on the concentrations of the two surfactants in solution.
authors.affiliation: Laboratoire d'Energétique et Réactivité aux Interfaces, EA 1519, case 39, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France.
authors.forename: M
authors.initials: M
authors.lastname: Turmine
authors.forename: C
authors.initials: C
authors.lastname: Macé
authors.forename: F
authors.initials: F
authors.lastname: Millot
authors.forename: P
authors.initials: P
authors.lastname: Letellier