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The Quantitative analysis of rare earth elements which are considered as the standard method that has a high accuracy, and detection limits achieved by the order of ppm is inductively coupled plasma atomic emission spectroscopy (ICPAES). But these tools are expensive and valuable analysis of the high cost of implementation. In this study had made and characterized selective electrode for the determination of rare earth ions is potentiometric method. Membrane manufacturing techniques studied is based on immersion (liquid impregnated membrane) in PTFE 0.45 pore size. As ionophore to be used is tributyl phosphate (TBP). There is no report previously that TBP used as ionophore in polymeric membrane based on lanthanum. Some parameters that affect the performance of membrane electrode such as membrane composition, membrane thickness, and types of membrane materials studied in this research. Manufacturing of Ion Selective Electrodes (ISE) Lanthanum (La) by means of impregnation La membrane in TBP in kerosene solution has been done and showed performance for ISE-La. FTIR spectrum results for PTFE 0.5 pore size which impregnated in TBP and PTFE blank showed difference of spectra in the top 1257 cm, 1031 cm and 794.7 cm for P=O stretching and stretching POC from group -OP=O. The result showed shift wave number for P =O stretching of the cluster (-OP=O) in PTFE-TBP mixture that is at the peak of 1230 cm indicated that no interaction bond between hydroxyl group of molecules with molecular clusters fosforil of TBP or R3P=O. The membrane had stable responses in pH range between 3 and 8. Good responses were obtained using 10 M La(III) internal solution, which produced relatively high potential. ISE-La showed relatively good performances. The electrode had a response time of 29±4.5 second and could be use for 50 days. The linear range was between 10 M and 10and shown Nernstian slope 19.34 mV/decade activity.

Potentiometric Selectivity Of Polymer-Membrane Electrodes Based On Lanthanum With Tributyl phosphate (TBP) as Ionophore