A coated-wire (11) electrode for potentiometrically titrating surfactant molecules having more than ten carbon atoms includes an electrically-conductive core (31) coated with a semipermeable membrane (35). The membrane matrix includes a polymer, a plasticizer and an ion-exchange material consisting essentially of dimidium bromide-disulphine blue in suitable proportions to be surfactant selective. The membrane is responsive to anionic, cationic and amphoteric surfactants as well as alkoxylated nonionic surfactants.
用于电位滴定具有十个以上碳原子的表面活性剂分子的涂膜丝(11)电极包括一个涂有半透膜(35)的导电芯(31)。膜基质包括聚合物、
增塑剂和离子交换材料,离子交换材料主要由
溴化二脒-
二硫化钼蓝组成,比例适当,具有表面活性剂选择性。该膜对阴离子、阳离子和两性表面活性剂以及烷氧基化非离子表面活性剂均有反应。