Novel PVC-based membrane sensors selective for vanadyl ions.
Poly(vinyl chloride) based membranes of di-(2-ethylhexyl)phosphoric acid (DEHPA) and dibutyl(butyl)phosphonate (DBBP) have been prepared and investigated as VO(2+)-selective sensors. The membranes containing DEHPA/DBBP and sodium tetraphenylborate, an anion excluder, show near-Nernstian/Nernstian response in the concentration range approximately 10(-5)-10(-1) M. The sensors exhibit a fast response time and good selectivity for VO(2+) over a number of other cations. Quantitative determination of vanadium in waste V(2)O(5) catalyst has been achieved by these sensors and they have also been used as indicator electrodes for the determination of the end point in the potentiometric titration of VO(2+) against EDTA.
Jain
A K
AK
Department of Chemistry, University of Roorkee, Roorkee-247 667 (U.P.), India.
Gupta
V K
VK
Singh
L P
LP
Khurana
U
U