Author/Authors :
Tyagi، Sonika نويسنده Department of Chemistry, Faculty of Natural Science Jamia Millia Islamia (Central University), New Delhi-110 025, India , , Agarwal، Himanshu نويسنده epartment of Chemistry, Faculty of Natural Science Jamia Millia Islamia (Central University), New Delhi-110 025, India , , Ikram، Saiqa نويسنده Department of Chemistry, Faculty of Natural Science Jamia Millia Islamia (Central University), New Delhi-110 025, India , , Gupta، Mukesh Kumar نويسنده Department of Chemistry, Faculty of Science and Technology, Singhania University, Jhunjhunu- 333 515, India , , SINGH، SANJAY KUMAR نويسنده ,
Abstract :
The aim of this study was to construct and characterize an ion selective electrode for
the potentiometric determination of thorium ions. On hand study we introduced a new calixarene
molecule p-tert-butyl-thiacalix[4]arene derivative as ionophore for thorium(IV) selective
polymeric membrane electrode. Due to the decisive role of solvent mediators, we fabricated
membranes with the plasticizers DBP, DBBP, TEP, OA, DOP, 1-CN respectively and anionic
additive NaTPB. The best of the results were obtained with the membrane electrode composition
of DBP:PVC:Ionophore:NaTPB (57%:35%:6%:2%). Electrode sensor shows excellent
discrimination towards Th4+ ion in presence of other common cations. The resulting data clarified
that the electrode shows a Nernstian slope of 14.9±0.6 mV per decade for Th(IV) ions over a
broad working concentration range of 8.0×10-8 to 1.0×10-1 mol/L. Our electrode gives the
potential response in 7 sec for whole concentration range and this sensor can be used for seven
months. Electrode has been successfully applied for many environmental and biological samples
of thorium (IV) and as an indicator in potentiometric titration.
