PVC-membrane ion-selective bulk optode for Ag~+ ion based on hexathia-18-6 and 1,2-benzo-3-octadecanoylimino-7-diethylaminophenoxazine

摘要

A silver-selective optode membrane incorporating hexathia-18-crown-6 for cation recognition and a lipophilic chromoionpohore 1,2-benzo-3-octadecanoylimino-7-diethylaminophenoxazine for transduction has been prepared. The PVC membrane composition was optimized to result in the largest working concentration range. The response range of the proposed optode is 5.0 * 10~(-9)-5.0 * 10~(-5) mol L~(-1) Ag~+ with a limit of detection of 1.0 * 10~(-9) mol L~(-1). The probe works well at pH 5.0 and revealed small ion interference and good selectivity, reproducibility and stability.