Author/Authors :
Ikram، Saiqa نويسنده Department of Chemistry, Faculty of Natural Science Jamia Millia Islamia (Central University), New Delhi-110 025, India , , 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 , , Gupta، Mukesh Kumar نويسنده Department of Chemistry, Faculty of Science and Technology, Singhania University, Jhunjhunu- 333 515, India , , SINGH، SANJAY KUMAR نويسنده ,
Abstract :
In recent years, the monitoring and evaluation of Uranyl (UO2
2+) has received
growing attention from both nutritional and toxological points of view. In this experimental
study, we revealed that an electroactive material p-tert-butyl-biscalix[4]arene can be used as
an ionophore in the preparation of PVC based ion selective electrode and we found that it
shows ionophoric binding property for uranyl cation. This electrode shows excellent
selectivity for UO2
2+ with respect to most of the common cations including inner transition
and heavy metal ions. The proposed membrane sensor with p-tert-butyl-biscalix[4]arene
based receptor exhibits wide linear range, with the slope of 29.30±1.0 mV per decade over
the concentration range of 8.1×10-8 M-1.0×10-1 M, and membrane sensor shows a lowest
detection limit of 8.0×10-8 M of UO2
2+. This sensor satisfactorily works in aqueous media and
in non-aqueous media it works upto 40% (water-ethanol, water-methanol, water-acetone and
water-acetonitrile). This electrode shows independent response within the pH range of 1.0-5.5
and its fastest response time is 10 s. The proposed membrane electrode was applied
successfully for the determination of UO2
2+ in the presence of other cations (binary mixtures)
by direct potentiometry and in tap and sea-water samples.
