Author/Authors :
Chandra، Sulekh نويسنده Department of Chemistry, Zakir Husain College,University of Delhi, J.L.N.Marg, New Delhi-110002, India , , Rawat، Aruna نويسنده Department of Chemistry, Zakir Husain College, University of Delhi, J.L. Nehru Marg, New Delhi-110002, India , , Sarkar، Anjana نويسنده School of Applied Sciences, Netaji Subhas Institute of Technology, University of Delhi, Azad Hind Fauj Marg, Sector-3, Dwarka, New Delhi-110078, India , , Jain، Deepali نويسنده Departments of Pathology and Urology, Sir Ganga Ram Hospital, New Delhi ,
Abstract :
A polymeric membrane based lanthanum selective electrode was developed
using N,Nʹ-1,3-phenylenedimaleimide. The best performance was recorded with a
membrane composition of PVC: DBP: Ionophore: NaTPB as 33: 64: 2: 1 (w/w %). The
Nernstian slope calculated from the calibration curve for La3+ sensor was 18.1 mV
decade-1. The detection limit of the sensor was 3.16×10-9 M, in the linear concentration
range of 1.0×10-2-1.0×10-8 M. Selectivity coefficients were calculated using Matched
Potential Method. The interaction mechanism of the ionophore with different cations
was estimated quantitatively by complex formation constant Kf values and qualitatively
by FTIR spectroscopy and UV-Vis. spectrophotometry. The electrode was successfully
applied to determine the fluoride content in the mouthwash and toothpaste sample.
