Author/Authors :
Chandra، Sulekh نويسنده Department of Chemistry, Zakir Husain College,University of Delhi, J.L.N.Marg, New Delhi-110002, India , , Agrawal ، Swati نويسنده Department of Chemistry, Motilal Nehru College (Delhi University), Benito Juarez Marg,New Delhi – 110021, India , , Singh، Devraj نويسنده Department of Chemistry, Zakir Husain College (Delhi University), J.L.N. Marg, Delhi – 110002, India ,
Abstract :
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.
