PVC membrane based potentiometric sensor for uranyl ion using thenoyl trifluoro acetone as ionophore

摘要

Uranyl ion selective electrode based on thenoyl trifluor acetone (TTA) incorporated into a polyvinyl chloride (PVC) membrane has been developed where dibutyl phthalate and sodium tetraphenyl borate have been used as plasticizer and anion excluder respectively.The PVC membrane containing the active ionophore.TTA,and the other ingredients has been directly cast on a graphite electrode.The electrode shows near Nernstian response to UO_2~(2+) in the concentration range of 10~(-3) to 10~(-6) mol L~(-1) with an average slope of 30 mV/decade.Alkali and alkaline earth metal ions do not interfere with the determination of uranyl ion.Interference of transition metal ions and Th(IV) is eliminated with EDTA.