Abstract
A laurylsulfate-selective electrode is presented. The sensing material of the electrode consists of an ion pair 1:1 water insoluble salt that has been prepared using sodium laurylsulfate and hexadecyl trimethylammonium bromide and was immobilized in a PVC membrane plasticized with orto-nitrophenyl octyl ether. This electrode gives a linear response for sodium laurylsulfate between 8x10-7 - 5x10-3 M with a slope of 57,7 mV per decade of sodium laurylsulfate concentration. The electrode has been applied to potentiometric titration of anionic surfactant using cationic surfactant as titration agents.
Keywords: ion-selective electrodes; anionic surfactant; potentiometry; sodium laurylsulfate