Construction of La(III) Selective PVC Electrode by Using Compound Diaza-trioxo-Dibenzocyclotridecane (DATODBCTD)

In this article a new PVC based La(III) ion selective electrode based on 1, 12- diaza-5,8,13-trioxo-3(4), 9(10)-dibenzocyclotridecane(DATODBCTD) ionophore is described. This sensor has a wide linear range of concentration (3.4×10- 7-1.0×10-2) and a low detection limit of 8.0×10-7 mol L?1of La(NO3)3. It has a Nernstian response with slope of 19.4±0.4 mV decade?1 and it is applicable in the pH range of 3.5-8.0 without any divergence in potentioal. The PVC electrode has a short response time of approximately 20 s and is stable at least for 2.1 days. The electrode shows a good selectivity for La3+ ion toward a wide variety of metal ions. The proposed sensor was successfully applied for the determination of La3+ ion in different real and environmental samples and as indicator electrode for potentiometric titration of La(III) ion with EDTA.