用电活性离子对制成的离子选择电极测定阳离子表面活性剂

Determination of Cationic Surfactants with Ion Selective Electrodes Based on Electroactive Ion-pair Complex

制备了3种基于不同电活性物质(十二烷基二甲基苄基铵-四苯硼、十六烷基三甲基铵-四苯硼、十八烷基三甲基铵-四苯硼)的阳离子表面活性剂离子选择电极,并对其性能做了测定,结果显示该类电极对阳离子表面活性剂十二烷基二甲基苄基氯化铵、十六烷基三甲基溴化铵、十八烷基三甲基氯化铵均有能斯特响应。以此类电极作为指示电极,四苯硼钠溶液作为滴定剂,对阳离子表面活性剂(十二烷基二甲基苄基氯化铵、十八烷基三甲基氯化铵、海明1622)进行了活性物含量的测定,与两相滴定法测定结果进行了比较。

Three kinds of ion selective electrodes （ISE＇s） based on ion pair complexes with dodecyldimethyl benzylammonium tetraphenylborate, hexadecyltrimethyl ammonium tetraphenylborate and octadecyltrimethyl ammonium tetraphenylborate as sensing materials individually, were prepared and their electrochemical properties tested. Good Nernst responses of these 3 ISE＇s were observed against the cationic surfactants dodecyldimethyl benzyl ammonium chloride （DDMBAC）, hexadecyl trimethyl ammonium bromide （HTMAB） and octadecyltrimethyl ammonium chloride （OTMAC）, and the ISE＇ s were found feasible to be used for the determination of the above mentioned cationic surfactants. These ISE＇s were also used as indicator electrodes in the potentiometric titration of DDMBAC, OTMAC and Hyamine 1622 using sodium tetraphenylborate as titrant. Results obtained were found to be checked quite well with the 2-phase titrimetry.